{"id":335,"date":"2025-12-17T01:04:15","date_gmt":"2025-12-16T17:04:15","guid":{"rendered":"http:\/\/4.189.252.43\/?p=335"},"modified":"2025-12-17T01:04:17","modified_gmt":"2025-12-16T17:04:17","slug":"%e7%ac%ac%e4%b9%9d%e7%ab%a0-%e7%bb%9f%e8%ae%a1%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5","status":"publish","type":"post","link":"http:\/\/4.189.252.43\/index.php\/2025\/12\/17\/%e7%ac%ac%e4%b9%9d%e7%ab%a0-%e7%bb%9f%e8%ae%a1%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5\/","title":{"rendered":"\u7b2c\u4e5d\u7ae0 \u7edf\u8ba1\u7684\u57fa\u672c\u6982\u5ff5"},"content":{"rendered":"\n<h2>\u4e00\u3001\u6838\u5fc3\u57fa\u672c\u6982\u5ff5<\/h2>\n<h3>1. \u603b\u4f53\u4e0e\u6837\u672c<\/h3>\n<ul>\n<li>\u603b\u4f53\uff1a\u7814\u7a76\u5bf9\u8c61\u7684\u5168\u4f53\uff0c\u7528\u968f\u673a\u53d8\u91cf <span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"1.979ex\" height=\"1.877ex\" viewBox=\"0 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type=\"math\/tex\">n<\/script>\u3002<\/li>\n<li>\u6837\u672c\u503c\uff1a\u89c2\u5bdf\u6837\u672c\u5f97\u5230\u7684\u786e\u5b9a\u6570\u503c <span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"13.507ex\" height=\"1.76ex\" viewBox=\"0 -504.6 5815.4 757.9\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.588ex;\"><defs><path stroke-width=\"0\" id=\"E721-MJMATHI-78\" d=\"M52 289Q59 331 106 386T222 442Q257 442 286 424T329 379Q371 442 430 442Q467 442 494 420T522 361Q522 332 508 314T481 292T458 288Q439 288 427 299T415 328Q415 374 465 391Q454 404 425 404Q412 404 406 402Q368 386 350 336Q290 115 290 78Q290 50 306 38T341 26Q378 26 414 59T463 140Q466 150 469 151T485 153H489Q504 153 504 145Q504 144 502 134Q486 77 440 33T333 -11Q263 -11 227 52Q186 -10 133 -10H127Q78 -10 57 16T35 71Q35 103 54 123T99 143Q142 143 142 101Q142 81 130 66T107 46T94 41L91 40Q91 39 97 36T113 29T132 26Q168 26 194 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xlink:href=\"#E721-MJMATHI-6E\" x=\"808\" y=\"-213\"><\/use><\/g><\/g><\/svg><\/span><script type=\"math\/tex\">x_1, x_2, ..., x_n<\/script>\u3002<\/li>\n<li>\u6837\u672c\u7684\u4e8c\u91cd\u6027\uff1a\u4e00\u6b21\u89c2\u5bdf\u4e2d\u4e3a\u786e\u5b9a\u6570\u503c\uff0c\u4e0d\u540c\u62bd\u6837\u4e0b\u4e3a\u968f\u673a\u53d8\u91cf\u3002<\/li>\n\n<\/ul>\n<h4>\u7b80\u5355\u968f\u673a\u6837\u672c\uff1a<\/h4>\n<p><strong>\u5b9a\u4e49 0.1<\/strong> \u5982\u679c\u6837\u672c  <span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"15.29ex\" height=\"2.344ex\" viewBox=\"0 -755.9 6583.4 1009.2\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.588ex;\"><defs><path stroke-width=\"0\" id=\"E737-MJMATHI-58\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 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transform=\"translate(1726,0)\"><use xlink:href=\"#E737-MJMATHI-58\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E737-MJMAIN-32\" x=\"1170\" y=\"-213\"><\/use><\/g><use xlink:href=\"#E737-MJMAIN-2C\" x=\"3007\" y=\"0\"><\/use><use xlink:href=\"#E737-MJMAIN-2E\" x=\"3452\" y=\"0\"><\/use><use xlink:href=\"#E737-MJMAIN-2E\" x=\"3897\" y=\"0\"><\/use><use xlink:href=\"#E737-MJMAIN-2E\" x=\"4341\" y=\"0\"><\/use><use xlink:href=\"#E737-MJMAIN-2C\" x=\"4786\" y=\"0\"><\/use><g transform=\"translate(5231,0)\"><use xlink:href=\"#E737-MJMATHI-58\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E737-MJMATHI-6E\" x=\"1170\" y=\"-213\"><\/use><\/g><\/g><\/svg><\/span><script type=\"math\/tex\">X_1, X_2, ..., X_n<\/script> \u6ee1\u8db3<\/p>\n<ul>\n<li><strong>\u4ee3\u8868\u6027\uff1a<\/strong>\uff08<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" 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y=\"-213\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">X_i<\/script> \u4e0e <span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"1.979ex\" height=\"1.877ex\" viewBox=\"0 -755.9 852 808.1\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.121ex;\"><defs><path stroke-width=\"0\" id=\"E812-MJMATHI-58\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 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..., X_n<\/script> \u4e4b\u95f4\u72ec\u7acb\u5206\u5e03<\/li>\n\n<\/ul>\n<p>\u5219\u6210\u4e3a\u603b\u4f53<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"1.979ex\" height=\"1.877ex\" viewBox=\"0 -755.9 852 808.1\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.121ex;\"><defs><path stroke-width=\"0\" id=\"E812-MJMATHI-58\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 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type=\"math\/tex\">T<\/script> \u4e3a\u7edf\u8ba1\u91cf\u3002<\/li>\n<li>\u6027\u8d28\uff1a\u7edf\u8ba1\u91cf\u662f\u968f\u673a\u53d8\u91cf\uff0c\u5176\u89c2\u5bdf\u503c\u4e3a <span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"16.429ex\" height=\"2.577ex\" viewBox=\"0 -806.1 7073.4 1109.7\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E740-MJMATHI-67\" d=\"M311 43Q296 30 267 15T206 0Q143 0 105 45T66 160Q66 265 143 353T314 442Q361 442 401 394L404 398Q406 401 409 404T418 412T431 419T447 422Q461 422 470 413T480 394Q480 379 423 152T363 -80Q345 -134 286 -169T151 -205Q10 -205 10 -137Q10 -111 28 -91T74 -71Q89 -71 102 -80T116 -111Q116 -121 114 -130T107 -144T99 -154T92 -162L90 -164H91Q101 -167 151 -167Q189 -167 211 -155Q234 -144 254 -122T282 -75Q288 -56 298 -13Q311 35 311 43ZM384 328L380 339Q377 350 375 354T369 368T359 382T346 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transform=\"translate(1056,-286)\"><use transform=\"scale(0.707)\" xlink:href=\"#E742-MJMATHI-69\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E742-MJMAIN-3D\" x=\"345\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E742-MJMAIN-31\" x=\"1123\" y=\"0\"><\/use><\/g><\/g><use xlink:href=\"#E742-MJMAIN-28\" x=\"5725\" y=\"0\"><\/use><g transform=\"translate(6114,0)\"><use xlink:href=\"#E742-MJMATHI-58\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E742-MJMATHI-69\" x=\"1170\" y=\"-213\"><\/use><\/g><use xlink:href=\"#E742-MJMAIN-2212\" x=\"7508\" y=\"0\"><\/use><g transform=\"translate(8508,0)\"><use xlink:href=\"#E742-MJMATHI-58\" x=\"24\" y=\"0\"><\/use><g transform=\"translate(15,498)\"><use transform=\"scale(0.707)\" xlink:href=\"#E742-MJMAIN-AF\" x=\"-69\" y=\"0\"><\/use><g transform=\"translate(189.99863838272435,0) scale(1.337700706764202,1)\"><use transform=\"scale(0.707)\" xlink:href=\"#E742-MJMAIN-AF\"><\/use><\/g><use transform=\"scale(0.707)\" xlink:href=\"#E742-MJMAIN-AF\" x=\"774\" y=\"0\"><\/use><\/g><\/g><g transform=\"translate(9425,0)\"><use xlink:href=\"#E742-MJMAIN-29\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E742-MJMAIN-32\" x=\"550\" y=\"513\"><\/use><\/g><\/g><\/svg><\/span><script type=\"math\/tex\">S_n^2 = \\frac{1}{n} \\sum_{i=1}^{n} (X_i - \\overline{X})^2<\/script>\uff0c\u6837\u672c\u6807\u51c6\u5dee <span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"10.703ex\" height=\"3.278ex\" viewBox=\"0 -1107.7 4608.1 1411.3\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E743-MJMATHI-53\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 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y=\"-211\"><\/use><\/g><\/g><\/g><\/svg><\/span><script type=\"math\/tex\">S_n = \\sqrt{S_n^2}<\/script><\/li>\n<li>\u65e0\u504f\u65b9\u5dee\uff08\u5e38\u7528\uff09\uff1a<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"51.875ex\" height=\"4.679ex\" viewBox=\"0 -1308.7 22334.8 2014.4\" role=\"img\" focusable=\"false\" style=\"vertical-align: -1.639ex;\"><defs><path stroke-width=\"0\" id=\"E744-MJMATHI-53\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 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x=\"774\" y=\"0\"><\/use><\/g><use transform=\"scale(0.707)\" xlink:href=\"#E744-MJMAIN-32\" x=\"1297\" y=\"1050\"><\/use><\/g><use xlink:href=\"#E744-MJSZ2-29\" x=\"7573\" y=\"-1\"><\/use><\/g><\/g><\/svg><\/span><script type=\"math\/tex\">S^2 = \\frac{1}{n-1} \\sum_{i=1}^{n} (X_i - \\overline{X})^2 = \\frac{1}{n-1} \\left( \\sum_{i=1}^{n} X_i^2 - n\\overline{X}^2 \\right)<\/script><\/li>\n\n<\/ul>\n<h4>\u6838\u5fc3\u6027\u8d28<\/h4>\n<p>\u8bbe\u603b\u4f53 <span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"9.542ex\" height=\"2.577ex\" viewBox=\"0 -806.1 4108.6 1109.7\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E745-MJMATHI-45\" d=\"M492 213Q472 213 472 226Q472 230 477 250T482 285Q482 316 461 323T364 330H312Q311 328 277 192T243 52Q243 48 254 48T334 46Q428 46 458 48T518 61Q567 77 599 117T670 248Q680 270 683 272Q690 274 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xlink:href=\"#E746-MJMAIN-29\" x=\"3519\" y=\"0\"><\/use><use xlink:href=\"#E746-MJMAIN-3D\" x=\"4185\" y=\"0\"><\/use><g transform=\"translate(5241,0)\"><use xlink:href=\"#E746-MJMATHI-3C3\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E746-MJMAIN-32\" x=\"809\" y=\"513\"><\/use><\/g><\/g><\/svg><\/span><script type=\"math\/tex\">VAR(X) = \\sigma^2<\/script>\uff0c\u5219\u6709\uff1a<\/p>\n<div contenteditable=\"true\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n47\" cid=\"n47\" mdtype=\"math_block\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><div class=\"MathJax_SVG_Display\"><span class=\"MathJax_SVG\" id=\"MathJax-Element-547-Frame\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"78.56ex\" height=\"3.978ex\" viewBox=\"0 -1107.7 33824.5 1712.8\" role=\"img\" focusable=\"false\" style=\"vertical-align: 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y=\"0\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/span><\/div><script type=\"math\/tex; mode=display\" id=\"MathJax-Element-547\">E[\\overline{X}] = \\mu, \\quad VAR(\\overline{X}) = \\sigma^2\/n, \\quad \\overline{X} \\overset{d}{\\to} \\mathcal{N}(\\mu, \\sigma^2\/n)<\/script><\/div><\/div>\n<p>\u6837\u672c\u65b9\u5dee<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"2.641ex\" height=\"2.694ex\" viewBox=\"0 -906.7 1137.3 1160\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.588ex;\"><defs><path stroke-width=\"0\" id=\"E854-MJMATHI-53\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 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tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"2.383ex\" height=\"2.344ex\" viewBox=\"0 -906.7 1025.9 1009.2\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.238ex;\"><defs><path stroke-width=\"0\" id=\"E750-MJMATHI-3C3\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path stroke-width=\"0\" id=\"E750-MJMAIN-32\" d=\"M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E750-MJMATHI-3C3\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E750-MJMAIN-32\" x=\"809\" y=\"513\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">\\sigma^2<\/script>\u4e4b\u95f4\u5b58\u5728\u504f\u5dee\uff0c\u5373<\/p>\n<div contenteditable=\"true\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n49\" cid=\"n49\" mdtype=\"math_block\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><div class=\"MathJax_SVG_Display\"><span class=\"MathJax_SVG\" id=\"MathJax-Element-548-Frame\" tabindex=\"-1\" style=\"font-size: 100%; display: 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xlink:href=\"#E699-MJMAIN-35\" x=\"389\" y=\"0\"><\/use><use xlink:href=\"#E699-MJMAIN-29\" x=\"889\" y=\"0\"><\/use><\/g><\/g><g transform=\"translate(13385,0)\"><g transform=\"translate(-15,0)\"><g transform=\"translate(0,-73)\"><use xlink:href=\"#E699-MJAMS-45\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E699-MJMAIN-5B\" x=\"667\" y=\"0\"><\/use><g transform=\"translate(945,0)\"><use xlink:href=\"#E699-MJMATHI-53\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E699-MJMAIN-32\" x=\"925\" y=\"487\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E699-MJMATHI-6E\" x=\"866\" y=\"-211\"><\/use><\/g><use xlink:href=\"#E699-MJMAIN-5D\" x=\"2082\" y=\"0\"><\/use><use xlink:href=\"#E699-MJMAIN-3D\" x=\"2638\" y=\"0\"><\/use><g transform=\"translate(3416,0)\"><g transform=\"translate(397,0)\"><rect stroke=\"none\" width=\"2442\" height=\"60\" x=\"0\" y=\"220\"><\/rect><g transform=\"translate(60,676)\"><use xlink:href=\"#E699-MJMATHI-6E\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E699-MJMAIN-2212\" x=\"822\" y=\"0\"><\/use><use xlink:href=\"#E699-MJMAIN-31\" x=\"1822\" y=\"0\"><\/use><\/g><use xlink:href=\"#E699-MJMATHI-6E\" x=\"921\" y=\"-686\"><\/use><\/g><\/g><g transform=\"translate(6376,0)\"><use xlink:href=\"#E699-MJMATHI-3C3\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E699-MJMAIN-32\" x=\"809\" y=\"583\"><\/use><\/g><\/g><\/g><\/g><\/g><\/svg><\/span><\/div><script type=\"math\/tex; mode=display\" id=\"MathJax-Element-548\">\\mathbb{E}[S_n^2] = \\frac{n - 1}{n} \\sigma^2<\/script><\/div><\/div>\n<p>\u65e0\u504f\u65b9\u5dee<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"2.574ex\" height=\"2.344ex\" viewBox=\"0 -906.7 1108.2 1009.2\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.238ex;\"><defs><path stroke-width=\"0\" id=\"E859-MJMATHI-53\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path stroke-width=\"0\" id=\"E859-MJMAIN-32\" d=\"M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E859-MJMATHI-53\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E859-MJMAIN-32\" x=\"925\" y=\"513\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">S^2<\/script>\u4e0e\u603b\u4f53\u65b9\u5dee<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"2.383ex\" height=\"2.344ex\" viewBox=\"0 -906.7 1025.9 1009.2\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.238ex;\"><defs><path stroke-width=\"0\" id=\"E750-MJMATHI-3C3\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 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xlink:href=\"#E750-MJMAIN-32\" x=\"809\" y=\"513\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">\\sigma^2<\/script>\u76f8\u7b49<\/p>\n<div contenteditable=\"true\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n51\" cid=\"n51\" mdtype=\"math_block\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><div class=\"MathJax_SVG_Display\"><span class=\"MathJax_SVG\" id=\"MathJax-Element-549-Frame\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"78.56ex\" height=\"3.044ex\" viewBox=\"0 -906.7 33824.5 1310.7\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.938ex; max-width: 100%;\" class=\"in-text-selection\"><defs><path stroke-width=\"0\" id=\"E700-MJMAIN-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 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y=\"-1\"><\/use><\/g><\/g><\/g><\/g><\/g><\/svg><\/span><\/div><script type=\"math\/tex; mode=display\" id=\"MathJax-Element-550\">\\begin{aligned}\n\\mathbb{E}[S_n^2] &= \\mathbb{E}\\left[\\frac{1}{n} \\sum_{i = 1}^n(X_i - \\bar{X})^2\\right]\\\\\n&= \\frac{1}{n} \\mathbb{E}\\left[\\sum_{i = 1}^n (X_i^2 - 2 X_i \\bar{X} + \\bar{X}^2)\\right]\\\\\n&= \\frac{1}{n} \\mathbb{E}\\left[\\sum_{i = 1}^n X_i^2 - 2 \\bar{X} \\sum_{i = 1}^n X_i + \\sum_{i = 1}^n \\bar{X}^2\\right]\\\\\n&= \\frac{1}{n} \\mathbb{E}\\left[\\sum_{i = 1}^n X_i^2\\right] - \\frac{2}{n^2}\\mathbb{E}\\left[\\bar{X}^2\\right]\n\n\\end{aligned}<\/script><\/div><\/div>\n<\/blockquote>\n<h3>2. \u6837\u672c\u77e9<\/h3>\n<ul>\n<li>\u6837\u672c <span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"1.21ex\" height=\"1.994ex\" viewBox=\"0 -755.9 521 858.4\" role=\"img\" focusable=\"false\" style=\"vertical-align: 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267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E752-MJMATHI-41\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E752-MJMATHI-6B\" x=\"1060\" y=\"-213\"><\/use><use xlink:href=\"#E752-MJMAIN-3D\" x=\"1496\" y=\"0\"><\/use><g transform=\"translate(2274,0)\"><g transform=\"translate(397,0)\"><rect stroke=\"none\" width=\"544\" height=\"60\" x=\"0\" y=\"220\"><\/rect><use transform=\"scale(0.707)\" xlink:href=\"#E752-MJMAIN-31\" x=\"134\" y=\"571\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E752-MJMATHI-6E\" x=\"84\" y=\"-488\"><\/use><\/g><\/g><g transform=\"translate(3502,0)\"><use xlink:href=\"#E752-MJSZ1-2211\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E752-MJMATHI-6E\" x=\"1493\" y=\"674\"><\/use><g transform=\"translate(1056,-286)\"><use transform=\"scale(0.707)\" xlink:href=\"#E752-MJMATHI-69\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E752-MJMAIN-3D\" x=\"345\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E752-MJMAIN-31\" x=\"1123\" y=\"0\"><\/use><\/g><\/g><g transform=\"translate(5973,0)\"><use xlink:href=\"#E752-MJMATHI-58\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E752-MJMATHI-6B\" x=\"1215\" y=\"498\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E752-MJMATHI-69\" x=\"1170\" y=\"-429\"><\/use><\/g><\/g><\/svg><\/span><script type=\"math\/tex\">A_k = \\frac{1}{n} \\sum_{i=1}^{n} X_i^k<\/script>\uff08\u4e00\u9636\u539f\u70b9\u77e9\u5373\u6837\u672c\u5747\u503c\uff09<\/li>\n<li>\u6837\u672c <span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"1.21ex\" height=\"1.994ex\" viewBox=\"0 -755.9 521 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y=\"0\"><\/use><g transform=\"translate(13077,0)\"><use xlink:href=\"#E702-MJMAIN-5D\" x=\"0\" y=\"0\"><\/use><g transform=\"translate(278,412)\"><use transform=\"scale(0.707)\" xlink:href=\"#E702-MJMATHI-6B\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E702-MJMAIN-2212\" x=\"521\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E702-MJMAIN-31\" x=\"1299\" y=\"0\"><\/use><\/g><\/g><use xlink:href=\"#E702-MJMAIN-5B\" x=\"14727\" y=\"0\"><\/use><use xlink:href=\"#E702-MJMAIN-31\" x=\"15005\" y=\"0\"><\/use><use xlink:href=\"#E702-MJMAIN-2212\" x=\"15728\" y=\"0\"><\/use><use xlink:href=\"#E702-MJMATHI-46\" x=\"16728\" y=\"0\"><\/use><use xlink:href=\"#E702-MJMAIN-28\" x=\"17477\" y=\"0\"><\/use><use xlink:href=\"#E702-MJMATHI-78\" x=\"17866\" y=\"0\"><\/use><use xlink:href=\"#E702-MJMAIN-29\" x=\"18438\" y=\"0\"><\/use><g transform=\"translate(18827,0)\"><use xlink:href=\"#E702-MJMAIN-5D\" x=\"0\" y=\"0\"><\/use><g transform=\"translate(278,412)\"><use transform=\"scale(0.707)\" xlink:href=\"#E702-MJMATHI-6E\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E702-MJMAIN-2212\" x=\"600\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E702-MJMATHI-6B\" x=\"1378\" y=\"0\"><\/use><\/g><\/g><use xlink:href=\"#E702-MJMATHI-66\" x=\"20548\" y=\"0\"><\/use><use xlink:href=\"#E702-MJMAIN-28\" x=\"21098\" y=\"0\"><\/use><use xlink:href=\"#E702-MJMATHI-78\" x=\"21487\" y=\"0\"><\/use><use xlink:href=\"#E702-MJMAIN-29\" x=\"22059\" y=\"0\"><\/use><\/g><\/g><\/g><\/g><\/g><\/svg><\/span><\/div><script type=\"math\/tex; mode=display\" id=\"MathJax-Element-551\">F_k(x) = \\sum_{r=k}^{n} \\binom{n}{r} [F(x)]^r [1-F(x)]^{n-r}, \\\\\nf_k(x) = \\frac{n!}{(k-1)!(n-k)!} [F(x)]^{k-1} [1-F(x)]^{n-k} f(x)<\/script><\/div><\/div>\n<blockquote><p><mark>\u8bc1\u660e<\/mark><\/p>\n<\/blockquote>\n<p><strong>Remarks\uff1a<\/strong><\/p>\n<ul>\n<li><p>\u6b21\u5e8f\u7edf\u8ba1\u91cf<span 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transform=\"scale(0.707)\" xlink:href=\"#E770-MJMAIN-28\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E770-MJMATHI-6B\" x=\"389\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E770-MJMAIN-29\" x=\"909\" y=\"0\"><\/use><\/g><\/g><\/svg><\/span><script type=\"math\/tex\">X_{(k)}<\/script>\u8868\u793a<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"15.301ex\" height=\"2.344ex\" viewBox=\"0 -755.9 6588 1009.2\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.588ex;\"><defs><path stroke-width=\"0\" id=\"E817-MJMATHI-58\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 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316T228 255Q230 254 243 252T267 246T293 238T320 224T342 206T359 180T365 147Q365 130 360 106T354 66Q354 26 381 26Q429 26 459 145Q461 153 479 153H483Q499 153 499 144Q499 139 496 130Q455 -11 378 -11Q333 -11 305 15T277 90Q277 108 280 121T283 145Q283 167 269 183T234 206T200 217T182 220H180Q168 178 159 139T145 81T136 44T129 20T122 7T111 -2Q98 -11 83 -11Q66 -11 57 -1T48 16Q48 26 85 176T158 471L195 616Q196 629 188 632T149 637H144Q134 637 131 637T124 640T121 647Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E880-MJMATHI-6B\" x=\"0\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">k<\/script>\u4e2a\u5206\u5e03\u5728\u4e0d\u540c\u533a\u95f4\u7684\u6982\u7387\u5bc6\u5ea6\u3002<\/p>\n<\/blockquote>\n<\/li>\n<li><p>\u4ee4<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"5.469ex\" height=\"1.994ex\" viewBox=\"0 -755.9 2354.6 858.4\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.238ex;\"><defs><path stroke-width=\"0\" id=\"E776-MJMATHI-6B\" d=\"M121 647Q121 657 125 670T137 683Q138 683 209 688T282 694Q294 694 294 686Q294 679 244 477Q194 279 194 272Q213 282 223 291Q247 309 292 354T362 415Q402 442 438 442Q468 442 485 423T503 369Q503 344 496 327T477 302T456 291T438 288Q418 288 406 299T394 328Q394 353 410 369T442 390L458 393Q446 405 434 405H430Q398 402 367 380T294 316T228 255Q230 254 243 252T267 246T293 238T320 224T342 206T359 180T365 147Q365 130 360 106T354 66Q354 26 381 26Q429 26 459 145Q461 153 479 153H483Q499 153 499 144Q499 139 496 130Q455 -11 378 -11Q333 -11 305 15T277 90Q277 108 280 121T283 145Q283 167 269 183T234 206T200 217T182 220H180Q168 178 159 139T145 81T136 44T129 20T122 7T111 -2Q98 -11 83 -11Q66 -11 57 -1T48 16Q48 26 85 176T158 471L195 616Q196 629 188 632T149 637H144Q134 637 131 637T124 640T121 647Z\"><\/path><path stroke-width=\"0\" id=\"E776-MJMAIN-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path stroke-width=\"0\" id=\"E776-MJMAIN-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E776-MJMATHI-6B\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E776-MJMAIN-3D\" x=\"798\" y=\"0\"><\/use><use xlink:href=\"#E776-MJMAIN-31\" x=\"1854\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">k = 1<\/script>\u548c<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"5.701ex\" height=\"1.994ex\" viewBox=\"0 -755.9 2454.6 858.4\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.238ex;\"><defs><path stroke-width=\"0\" id=\"E777-MJMATHI-6B\" d=\"M121 647Q121 657 125 670T137 683Q138 683 209 688T282 694Q294 694 294 686Q294 679 244 477Q194 279 194 272Q213 282 223 291Q247 309 292 354T362 415Q402 442 438 442Q468 442 485 423T503 369Q503 344 496 327T477 302T456 291T438 288Q418 288 406 299T394 328Q394 353 410 369T442 390L458 393Q446 405 434 405H430Q398 402 367 380T294 316T228 255Q230 254 243 252T267 246T293 238T320 224T342 206T359 180T365 147Q365 130 360 106T354 66Q354 26 381 26Q429 26 459 145Q461 153 479 153H483Q499 153 499 144Q499 139 496 130Q455 -11 378 -11Q333 -11 305 15T277 90Q277 108 280 121T283 145Q283 167 269 183T234 206T200 217T182 220H180Q168 178 159 139T145 81T136 44T129 20T122 7T111 -2Q98 -11 83 -11Q66 -11 57 -1T48 16Q48 26 85 176T158 471L195 616Q196 629 188 632T149 637H144Q134 637 131 637T124 640T121 647Z\"><\/path><path stroke-width=\"0\" id=\"E777-MJMAIN-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path stroke-width=\"0\" id=\"E777-MJMATHI-6E\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E777-MJMATHI-6B\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E777-MJMAIN-3D\" x=\"798\" y=\"0\"><\/use><use xlink:href=\"#E777-MJMATHI-6E\" x=\"1854\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">k = n<\/script>\uff0c\u5206\u522b\u5f97\u5230\u6700\u5c0f\u6b21\u5e8f\u7edf\u8ba1\u91cf\u548c\u6700\u5927\u6b21\u5e8f\u7edf\u8ba1\u91cf\u7684\u5206\u5e03\u51fd\u6570\u548c\u5bc6\u5ea6\u51fd\u6570<\/p>\n<\/li>\n\n<\/ul>\n<h2>\u4e09\u3001\u5e38\u7528\u7edf\u8ba1\u5206\u5e03<\/h2>\n<h3>1. Beta \u5206\u5e03<\/h3>\n<p><strong>\u5b9a\u4e49 0.7<\/strong> \uff08Beta \u51fd\u6570\uff09\u5bf9\u4efb\u610f\u7ed9\u5b9a\u7684<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"6.798ex\" height=\"2.227ex\" viewBox=\"0 -755.9 2927.1 958.9\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.472ex;\"><defs><path stroke-width=\"0\" id=\"E781-MJMATHI-3B1\" d=\"M34 156Q34 270 120 356T309 442Q379 442 421 402T478 304Q484 275 485 237V208Q534 282 560 374Q564 388 566 390T582 393Q603 393 603 385Q603 376 594 346T558 261T497 161L486 147L487 123Q489 67 495 47T514 26Q528 28 540 37T557 60Q559 67 562 68T577 70Q597 70 597 62Q597 56 591 43Q579 19 556 5T512 -10H505Q438 -10 414 62L411 69L400 61Q390 53 370 41T325 18T267 -2T203 -11Q124 -11 79 39T34 156ZM208 26Q257 26 306 47T379 90L403 112Q401 255 396 290Q382 405 304 405Q235 405 183 332Q156 292 139 224T121 120Q121 71 146 49T208 26Z\"><\/path><path stroke-width=\"0\" id=\"E781-MJMAIN-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path stroke-width=\"0\" id=\"E781-MJMAIN-3E\" d=\"M84 520Q84 528 88 533T96 539L99 540Q106 540 253 471T544 334L687 265Q694 260 694 250T687 235Q685 233 395 96L107 -40H101Q83 -38 83 -20Q83 -19 83 -17Q82 -10 98 -1Q117 9 248 71Q326 108 378 132L626 250L378 368Q90 504 86 509Q84 513 84 520Z\"><\/path><path stroke-width=\"0\" id=\"E781-MJMAIN-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E781-MJMATHI-3B1\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E781-MJMAIN-31\" x=\"905\" y=\"-213\"><\/use><use xlink:href=\"#E781-MJMAIN-3E\" x=\"1371\" y=\"0\"><\/use><use xlink:href=\"#E781-MJMAIN-30\" x=\"2427\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">\\alpha_1 > 0<\/script>\u548c<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"6.798ex\" height=\"2.227ex\" viewBox=\"0 -755.9 2927.1 958.9\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.472ex;\"><defs><path stroke-width=\"0\" id=\"E782-MJMATHI-3B1\" d=\"M34 156Q34 270 120 356T309 442Q379 442 421 402T478 304Q484 275 485 237V208Q534 282 560 374Q564 388 566 390T582 393Q603 393 603 385Q603 376 594 346T558 261T497 161L486 147L487 123Q489 67 495 47T514 26Q528 28 540 37T557 60Q559 67 562 68T577 70Q597 70 597 62Q597 56 591 43Q579 19 556 5T512 -10H505Q438 -10 414 62L411 69L400 61Q390 53 370 41T325 18T267 -2T203 -11Q124 -11 79 39T34 156ZM208 26Q257 26 306 47T379 90L403 112Q401 255 396 290Q382 405 304 405Q235 405 183 332Q156 292 139 224T121 120Q121 71 146 49T208 26Z\"><\/path><path stroke-width=\"0\" id=\"E782-MJMAIN-32\" d=\"M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z\"><\/path><path stroke-width=\"0\" id=\"E782-MJMAIN-3E\" d=\"M84 520Q84 528 88 533T96 539L99 540Q106 540 253 471T544 334L687 265Q694 260 694 250T687 235Q685 233 395 96L107 -40H101Q83 -38 83 -20Q83 -19 83 -17Q82 -10 98 -1Q117 9 248 71Q326 108 378 132L626 250L378 368Q90 504 86 509Q84 513 84 520Z\"><\/path><path stroke-width=\"0\" id=\"E782-MJMAIN-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E782-MJMATHI-3B1\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E782-MJMAIN-32\" x=\"905\" y=\"-213\"><\/use><use xlink:href=\"#E782-MJMAIN-3E\" x=\"1371\" y=\"0\"><\/use><use xlink:href=\"#E782-MJMAIN-30\" x=\"2427\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">\\alpha_2 > 0<\/script>\uff0c\u5b9a\u4e49Beta \u51fd\u6570\u4e3a<\/p>\n<div contenteditable=\"true\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n85\" cid=\"n85\" mdtype=\"math_block\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><div class=\"MathJax_SVG_Display\"><span class=\"MathJax_SVG\" id=\"MathJax-Element-552-Frame\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"78.56ex\" height=\"6.313ex\" viewBox=\"0 -1610.3 33824.5 2718\" role=\"img\" focusable=\"false\" style=\"vertical-align: -2.573ex; max-width: 100%;\" class=\"in-text-selection\"><defs><path stroke-width=\"0\" id=\"E703-MJMAIN-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 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xlink:href=\"#E703-MJMAIN-31\" x=\"905\" y=\"-213\"><\/use><\/g><use xlink:href=\"#E703-MJMAIN-2B\" x=\"2329\" y=\"0\"><\/use><g transform=\"translate(3329,0)\"><use xlink:href=\"#E703-MJMATHI-3B1\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E703-MJMAIN-32\" x=\"905\" y=\"-213\"><\/use><\/g><use xlink:href=\"#E703-MJMAIN-29\" x=\"4423\" y=\"0\"><\/use><\/g><\/g><\/g><use xlink:href=\"#E703-MJMAIN-2C\" x=\"22162\" y=\"0\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/span><\/div><script type=\"math\/tex; mode=display\" id=\"MathJax-Element-552\">B(\\alpha_1, \\alpha_2) = \\int_{0}^{1} x^{\\alpha_1-1}(1-x)^{\\alpha_2-1} dx = \\frac{\\Gamma(\\alpha_1)\\Gamma(\\alpha_2)}{\\Gamma(\\alpha_1+\\alpha_2)},<\/script><\/div><\/div>\n<p>\u7b80\u8bb0\u4e3a<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"9.682ex\" height=\"2.577ex\" viewBox=\"0 -806.1 4168.8 1109.7\" 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\\alpha_2)<\/script>\uff0c\u88ab\u79f0\u4e3a\u7b2c\u4e00\u7c7b\u6b27\u62c9\u79ef\u5206\u51fd\u6570\u3002<\/p>\n<p><strong>\u5b9a\u4e49 0.8<\/strong> \u7ed9\u5b9a\u7684<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"6.798ex\" height=\"2.227ex\" viewBox=\"0 -755.9 2927.1 958.9\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.472ex;\"><defs><path stroke-width=\"0\" id=\"E781-MJMATHI-3B1\" d=\"M34 156Q34 270 120 356T309 442Q379 442 421 402T478 304Q484 275 485 237V208Q534 282 560 374Q564 388 566 390T582 393Q603 393 603 385Q603 376 594 346T558 261T497 161L486 147L487 123Q489 67 495 47T514 26Q528 28 540 37T557 60Q559 67 562 68T577 70Q597 70 597 62Q597 56 591 43Q579 19 556 5T512 -10H505Q438 -10 414 62L411 69L400 61Q390 53 370 41T325 18T267 -2T203 -11Q124 -11 79 39T34 156ZM208 26Q257 26 306 47T379 90L403 112Q401 255 396 290Q382 405 304 405Q235 405 183 332Q156 292 139 224T121 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333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E781-MJMATHI-3B1\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E781-MJMAIN-31\" x=\"905\" y=\"-213\"><\/use><use xlink:href=\"#E781-MJMAIN-3E\" x=\"1371\" y=\"0\"><\/use><use xlink:href=\"#E781-MJMAIN-30\" x=\"2427\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">\\alpha_1 > 0<\/script>\u548c<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"6.798ex\" height=\"2.227ex\" viewBox=\"0 -755.9 2927.1 958.9\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.472ex;\"><defs><path stroke-width=\"0\" id=\"E782-MJMATHI-3B1\" d=\"M34 156Q34 270 120 356T309 442Q379 442 421 402T478 304Q484 275 485 237V208Q534 282 560 374Q564 388 566 390T582 393Q603 393 603 385Q603 376 594 346T558 261T497 161L486 147L487 123Q489 67 495 47T514 26Q528 28 540 37T557 60Q559 67 562 68T577 70Q597 70 597 62Q597 56 591 43Q579 19 556 5T512 -10H505Q438 -10 414 62L411 69L400 61Q390 53 370 41T325 18T267 -2T203 -11Q124 -11 79 39T34 156ZM208 26Q257 26 306 47T379 90L403 112Q401 255 396 290Q382 405 304 405Q235 405 183 332Q156 292 139 224T121 120Q121 71 146 49T208 26Z\"><\/path><path stroke-width=\"0\" id=\"E782-MJMAIN-32\" d=\"M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z\"><\/path><path stroke-width=\"0\" id=\"E782-MJMAIN-3E\" d=\"M84 520Q84 528 88 533T96 539L99 540Q106 540 253 471T544 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type=\"math\/tex\">\\alpha_2 > 0<\/script>\uff0c\u82e5\u968f\u673a\u53d8\u91cf<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"1.979ex\" height=\"1.877ex\" viewBox=\"0 -755.9 852 808.1\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.121ex;\"><defs><path stroke-width=\"0\" id=\"E812-MJMATHI-58\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 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y=\"-213\"><\/use><\/g><use xlink:href=\"#E788-MJMAIN-29\" x=\"5965\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">X \\sim B(\\alpha_1, \\alpha_2)<\/script>\u3002<\/p>\n<p><strong>\u5b9a\u7406 0.2<\/strong> \u82e5\u968f\u673a\u53d8\u91cf<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"14.758ex\" height=\"2.577ex\" viewBox=\"0 -806.1 6354.3 1109.7\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E788-MJMATHI-58\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 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md-end-block md-math-block md-rawblock\" id=\"mathjax-n91\" cid=\"n91\" mdtype=\"math_block\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><div class=\"MathJax_SVG_Display\"><span class=\"MathJax_SVG\" id=\"MathJax-Element-554-Frame\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"78.56ex\" height=\"5.145ex\" viewBox=\"0 -1359 33824.5 2215.4\" role=\"img\" focusable=\"false\" style=\"vertical-align: -1.989ex; max-width: 100%;\" class=\"in-text-selection\"><defs><path stroke-width=\"0\" id=\"E705-MJMAIN-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path stroke-width=\"0\" id=\"E705-MJMAIN-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 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y=\"0\"><\/use><g transform=\"translate(2704,0)\"><use xlink:href=\"#E705-MJMATHI-3B1\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E705-MJMAIN-32\" x=\"905\" y=\"-213\"><\/use><\/g><g transform=\"translate(3798,0)\"><use xlink:href=\"#E705-MJMAIN-29\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E705-MJMAIN-32\" x=\"550\" y=\"408\"><\/use><\/g><use xlink:href=\"#E705-MJMAIN-28\" x=\"4641\" y=\"0\"><\/use><g transform=\"translate(5030,0)\"><use xlink:href=\"#E705-MJMATHI-3B1\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E705-MJMAIN-31\" x=\"905\" y=\"-213\"><\/use><\/g><use xlink:href=\"#E705-MJMAIN-2B\" x=\"6345\" y=\"0\"><\/use><g transform=\"translate(7346,0)\"><use xlink:href=\"#E705-MJMATHI-3B1\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E705-MJMAIN-32\" x=\"905\" y=\"-213\"><\/use><\/g><use xlink:href=\"#E705-MJMAIN-2B\" x=\"8661\" y=\"0\"><\/use><use xlink:href=\"#E705-MJMAIN-31\" x=\"9662\" y=\"0\"><\/use><use xlink:href=\"#E705-MJMAIN-29\" x=\"10162\" y=\"0\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/span><\/div><script type=\"math\/tex; mode=display\" id=\"MathJax-Element-554\">E[X] = \\frac{\\alpha_1}{\\alpha_1+\\alpha_2}, \\quad VAR(X) = \\frac{\\alpha_1\\alpha_2}{(\\alpha_1+\\alpha_2)^2(\\alpha_1+\\alpha_2+1)}<\/script><\/div><\/div>\n<blockquote><p><mark>\u8bc1\u660e<\/mark><\/p>\n<\/blockquote>\n<h3>2. Dirichlet \u5206\u5e03<\/h3>\n<p><strong>\u5b9a\u4e49 0.9<\/strong> \u7ed9\u5b9a<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"21.259ex\" height=\"2.577ex\" viewBox=\"0 -806.1 9153.2 1109.7\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E789-MJMATHI-3B1\" d=\"M34 156Q34 270 120 356T309 442Q379 442 421 402T478 304Q484 275 485 237V208Q534 282 560 374Q564 388 566 390T582 393Q603 393 603 385Q603 376 594 346T558 261T497 161L486 147L487 123Q489 67 495 47T514 26Q528 28 540 37T557 60Q559 67 562 68T577 70Q597 70 597 62Q597 56 591 43Q579 19 556 5T512 -10H505Q438 -10 414 62L411 69L400 61Q390 53 370 41T325 18T267 -2T203 -11Q124 -11 79 39T34 156ZM208 26Q257 26 306 47T379 90L403 112Q401 255 396 290Q382 405 304 405Q235 405 183 332Q156 292 139 224T121 120Q121 71 146 49T208 26Z\"><\/path><path stroke-width=\"0\" id=\"E789-MJMAIN-31\" 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x_i=1 \u4e14 x_i>0 \\\\ 0, & \u5176\u4ed6 \\end{cases}<\/script><\/div><\/div>\n<p>\u79f0<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"1.979ex\" height=\"1.877ex\" viewBox=\"0 -755.9 852 808.1\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.121ex;\"><defs><path stroke-width=\"0\" id=\"E812-MJMATHI-58\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 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d=\"M34 156Q34 270 120 356T309 442Q379 442 421 402T478 304Q484 275 485 237V208Q534 282 560 374Q564 388 566 390T582 393Q603 393 603 385Q603 376 594 346T558 261T497 161L486 147L487 123Q489 67 495 47T514 26Q528 28 540 37T557 60Q559 67 562 68T577 70Q597 70 597 62Q597 56 591 43Q579 19 556 5T512 -10H505Q438 -10 414 62L411 69L400 61Q390 53 370 41T325 18T267 -2T203 -11Q124 -11 79 39T34 156ZM208 26Q257 26 306 47T379 90L403 112Q401 255 396 290Q382 405 304 405Q235 405 183 332Q156 292 139 224T121 120Q121 71 146 49T208 26Z\"><\/path><path stroke-width=\"0\" id=\"E792-MJMAIN-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path stroke-width=\"0\" id=\"E792-MJMAIN-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 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130Q455 -11 378 -11Q333 -11 305 15T277 90Q277 108 280 121T283 145Q283 167 269 183T234 206T200 217T182 220H180Q168 178 159 139T145 81T136 44T129 20T122 7T111 -2Q98 -11 83 -11Q66 -11 57 -1T48 16Q48 26 85 176T158 471L195 616Q196 629 188 632T149 637H144Q134 637 131 637T124 640T121 647Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E792-MJMATHI-3B1\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E792-MJMAIN-31\" x=\"905\" y=\"-213\"><\/use><use xlink:href=\"#E792-MJMAIN-2C\" x=\"1093\" y=\"0\"><\/use><use xlink:href=\"#E792-MJMAIN-2026\" x=\"1538\" y=\"0\"><\/use><use xlink:href=\"#E792-MJMAIN-2C\" x=\"2876\" y=\"0\"><\/use><g transform=\"translate(3321,0)\"><use xlink:href=\"#E792-MJMATHI-3B1\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E792-MJMATHI-6B\" x=\"905\" y=\"-213\"><\/use><\/g><\/g><\/svg><\/span><script type=\"math\/tex\">\\alpha_1 , \\dots, \\alpha_k<\/script>\u7684 <strong>Dirichlet \u5206\u5e03<\/strong>\uff0c\u8bb0\u4e3a<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"20.944ex\" height=\"2.577ex\" viewBox=\"0 -806.1 9017.5 1109.7\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E793-MJMATHI-58\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path stroke-width=\"0\" id=\"E793-MJMAIN-223C\" d=\"M55 166Q55 241 101 304T222 367Q260 367 296 349T362 304T421 252T484 208T554 189Q616 189 655 236T694 338Q694 350 698 358T708 367Q722 367 722 334Q722 260 677 197T562 134H554Q517 134 481 152T414 196T355 248T292 293T223 311Q179 311 145 286Q109 257 96 218T80 156T69 133Q55 133 55 166Z\"><\/path><path stroke-width=\"0\" id=\"E793-MJMATHI-44\" d=\"M287 628Q287 635 230 637Q207 637 200 638T193 647Q193 655 197 667T204 682Q206 683 403 683Q570 682 590 682T630 676Q702 659 752 597T803 431Q803 275 696 151T444 3L430 1L236 0H125H72Q48 0 41 2T33 11Q33 13 36 25Q40 41 44 43T67 46Q94 46 127 49Q141 52 146 61Q149 65 218 339T287 628ZM703 469Q703 507 692 537T666 584T629 613T590 629T555 636Q553 636 541 636T512 636T479 637H436Q392 637 386 627Q384 623 313 339T242 52Q242 48 253 48T330 47Q335 47 349 47T373 46Q499 46 581 128Q617 164 640 212T683 339T703 469Z\"><\/path><path stroke-width=\"0\" id=\"E793-MJMATHI-69\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path stroke-width=\"0\" id=\"E793-MJMATHI-72\" d=\"M21 287Q22 290 23 295T28 317T38 348T53 381T73 411T99 433T132 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70Q597 70 597 62Q597 56 591 43Q579 19 556 5T512 -10H505Q438 -10 414 62L411 69L400 61Q390 53 370 41T325 18T267 -2T203 -11Q124 -11 79 39T34 156ZM208 26Q257 26 306 47T379 90L403 112Q401 255 396 290Q382 405 304 405Q235 405 183 332Q156 292 139 224T121 120Q121 71 146 49T208 26Z\"><\/path><path stroke-width=\"0\" id=\"E793-MJMAIN-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path stroke-width=\"0\" id=\"E793-MJMAIN-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path stroke-width=\"0\" id=\"E793-MJMAIN-2026\" d=\"M78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60ZM525 60Q525 84 542 102T585 120Q609 120 627 104T646 61Q646 36 629 18T586 0T543 17T525 60ZM972 60Q972 84 989 102T1032 120Q1056 120 1074 104T1093 61Q1093 36 1076 18T1033 0T990 17T972 60Z\"><\/path><path stroke-width=\"0\" id=\"E793-MJMATHI-6B\" d=\"M121 647Q121 657 125 670T137 683Q138 683 209 688T282 694Q294 694 294 686Q294 679 244 477Q194 279 194 272Q213 282 223 291Q247 309 292 354T362 415Q402 442 438 442Q468 442 485 423T503 369Q503 344 496 327T477 302T456 291T438 288Q418 288 406 299T394 328Q394 353 410 369T442 390L458 393Q446 405 434 405H430Q398 402 367 380T294 316T228 255Q230 254 243 252T267 246T293 238T320 224T342 206T359 180T365 147Q365 130 360 106T354 66Q354 26 381 26Q429 26 459 145Q461 153 479 153H483Q499 153 499 144Q499 139 496 130Q455 -11 378 -11Q333 -11 305 15T277 90Q277 108 280 121T283 145Q283 167 269 183T234 206T200 217T182 220H180Q168 178 159 139T145 81T136 44T129 20T122 7T111 -2Q98 -11 83 -11Q66 -11 57 -1T48 16Q48 26 85 176T158 471L195 616Q196 629 188 632T149 637H144Q134 637 131 637T124 640T121 647Z\"><\/path><path stroke-width=\"0\" id=\"E793-MJMAIN-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E793-MJMATHI-58\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E793-MJMAIN-223C\" x=\"1129\" y=\"0\"><\/use><use xlink:href=\"#E793-MJMATHI-44\" x=\"2185\" y=\"0\"><\/use><use xlink:href=\"#E793-MJMATHI-69\" x=\"3013\" y=\"0\"><\/use><use xlink:href=\"#E793-MJMATHI-72\" x=\"3358\" y=\"0\"><\/use><use xlink:href=\"#E793-MJMAIN-28\" x=\"3809\" y=\"0\"><\/use><g transform=\"translate(4198,0)\"><use xlink:href=\"#E793-MJMATHI-3B1\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E793-MJMAIN-31\" x=\"905\" y=\"-213\"><\/use><\/g><use xlink:href=\"#E793-MJMAIN-2C\" x=\"5292\" y=\"0\"><\/use><use xlink:href=\"#E793-MJMAIN-2026\" x=\"5736\" y=\"0\"><\/use><use xlink:href=\"#E793-MJMAIN-2C\" x=\"7075\" y=\"0\"><\/use><g transform=\"translate(7520,0)\"><use xlink:href=\"#E793-MJMATHI-3B1\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E793-MJMATHI-6B\" x=\"905\" y=\"-213\"><\/use><\/g><use xlink:href=\"#E793-MJMAIN-29\" x=\"8628\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">X \\sim Dir(\\alpha_1, \\dots , \\alpha_k)<\/script>.<\/p>\n<blockquote><p>Dirichlet \u5206\u5e03\u662f Beta\u5206\u5e03\u7684\u4e00\u79cd\u9ad8\u7ef4\u63a8\u5e7f\u3002\u5f53<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"5.469ex\" height=\"1.994ex\" viewBox=\"0 -755.9 2354.6 858.4\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.238ex;\"><defs><path stroke-width=\"0\" id=\"E794-MJMATHI-6B\" d=\"M121 647Q121 657 125 670T137 683Q138 683 209 688T282 694Q294 694 294 686Q294 679 244 477Q194 279 194 272Q213 282 223 291Q247 309 292 354T362 415Q402 442 438 442Q468 442 485 423T503 369Q503 344 496 327T477 302T456 291T438 288Q418 288 406 299T394 328Q394 353 410 369T442 390L458 393Q446 405 434 405H430Q398 402 367 380T294 316T228 255Q230 254 243 252T267 246T293 238T320 224T342 206T359 180T365 147Q365 130 360 106T354 66Q354 26 381 26Q429 26 459 145Q461 153 479 153H483Q499 153 499 144Q499 139 496 130Q455 -11 378 -11Q333 -11 305 15T277 90Q277 108 280 121T283 145Q283 167 269 183T234 206T200 217T182 220H180Q168 178 159 139T145 81T136 44T129 20T122 7T111 -2Q98 -11 83 -11Q66 -11 57 -1T48 16Q48 26 85 176T158 471L195 616Q196 629 188 632T149 637H144Q134 637 131 637T124 640T121 647Z\"><\/path><path stroke-width=\"0\" id=\"E794-MJMAIN-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path stroke-width=\"0\" id=\"E794-MJMAIN-32\" d=\"M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E794-MJMATHI-6B\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E794-MJMAIN-3D\" x=\"798\" y=\"0\"><\/use><use xlink:href=\"#E794-MJMAIN-32\" x=\"1854\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">k = 2<\/script>\u65f6\uff0cDirichlet \u5206\u5e03\u9000\u5316\u4e3abeta \u5206\u5e03\u3002<\/p>\n<p><mark>\u8bc1\u660e<\/mark><\/p>\n<\/blockquote>\n<p><strong>\u5b9a\u7406 0.3<\/strong> \u82e5\u968f\u673a\u53d8\u91cf<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"24.517ex\" height=\"2.577ex\" viewBox=\"0 -806.1 10555.7 1109.7\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E795-MJMATHI-58\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 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xlink:href=\"#E707-MJMAIN-2C\" x=\"2563\" y=\"0\"><\/use><\/g><\/g><g transform=\"translate(4468,0)\"><g transform=\"translate(0,764)\"><use xlink:href=\"#E707-MJMATHI-69\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E707-MJMAIN-3D\" x=\"622\" y=\"0\"><\/use><use xlink:href=\"#E707-MJMATHI-6A\" x=\"1678\" y=\"0\"><\/use><\/g><g transform=\"translate(0,-943)\"><use xlink:href=\"#E707-MJMATHI-69\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E707-MJMAIN-2260\" x=\"622\" y=\"0\"><\/use><use xlink:href=\"#E707-MJMATHI-6A\" x=\"1678\" y=\"0\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/span><\/div><script type=\"math\/tex; mode=display\" id=\"MathJax-Element-556\">E[X_i] = \\tilde{\\alpha}_i, \\quad COV(X_i, X_j) = \n\\begin{cases}\n\\frac{\\tilde{\\alpha}_i(1-\\tilde{\\alpha}_i)}{\\tilde{\\alpha}+1}, & i = j\\\\\n-\\frac{\\tilde{\\alpha}_i\\tilde{\\alpha}_j}{\\tilde{\\alpha}+1}, & i \\neq j\n\\end{cases}<\/script><\/div><\/div>\n<blockquote><p><mark>\u8bc1\u660e<\/mark><\/p>\n<\/blockquote>\n<h3>3. Gamma \u5206\u5e03<\/h3>\n<p><strong>\u5b9a\u4e49 0.10<\/strong> \uff08<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"1.452ex\" height=\"1.877ex\" viewBox=\"0 -755.9 625 808.1\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.121ex;\"><defs><path stroke-width=\"0\" id=\"E809-MJMAIN-393\" d=\"M128 619Q121 626 117 628T101 631T58 634H25V680H554V676Q556 670 568 560T582 444V440H542V444Q542 445 538 478T523 545T492 598Q454 634 349 634H334Q264 634 249 633T233 621Q232 618 232 339L233 61Q240 54 245 52T270 48T333 46H360V0H348Q324 3 182 3Q51 3 36 0H25V46H58Q100 47 109 49T128 61V619Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E809-MJMAIN-393\" x=\"0\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">\\Gamma<\/script> 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xlink:href=\"#E709-MJMAIN-30\" x=\"1905\" y=\"0\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/span><\/div><script type=\"math\/tex; mode=display\" id=\"MathJax-Element-558\">f(x) = \\begin{cases} \\frac{\\lambda^\\alpha}{\\Gamma(\\alpha)} x^{\\alpha-1} e^{-\\lambda x}, & x>0 \\\\ 0, & x \\leq 0 \\end{cases}<\/script><\/div><\/div>\n<p>\u5176\u4e2d<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"12.39ex\" height=\"2.344ex\" viewBox=\"0 -755.9 5334.8 1009.2\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.588ex;\"><defs><path stroke-width=\"0\" id=\"E802-MJMATHI-3B1\" d=\"M34 156Q34 270 120 356T309 442Q379 442 421 402T478 304Q484 275 485 237V208Q534 282 560 374Q564 388 566 390T582 393Q603 393 603 385Q603 376 594 346T558 261T497 161L486 147L487 123Q489 67 495 47T514 26Q528 28 540 37T557 60Q559 67 562 68T577 70Q597 70 597 62Q597 56 591 43Q579 19 556 5T512 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xlink:href=\"#E802-MJMATHI-3BB\" x=\"2918\" y=\"0\"><\/use><use xlink:href=\"#E802-MJMAIN-3E\" x=\"3779\" y=\"0\"><\/use><use xlink:href=\"#E802-MJMAIN-30\" x=\"4834\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">\\alpha>0,\\lambda>0<\/script>\uff0c\u79f0<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"1.979ex\" height=\"1.877ex\" viewBox=\"0 -755.9 852 808.1\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.121ex;\"><defs><path stroke-width=\"0\" id=\"E812-MJMATHI-58\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 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width=\"1.486ex\" height=\"1.41ex\" viewBox=\"0 -504.6 640 607.1\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.238ex;\"><defs><path stroke-width=\"0\" id=\"E804-MJMATHI-3B1\" d=\"M34 156Q34 270 120 356T309 442Q379 442 421 402T478 304Q484 275 485 237V208Q534 282 560 374Q564 388 566 390T582 393Q603 393 603 385Q603 376 594 346T558 261T497 161L486 147L487 123Q489 67 495 47T514 26Q528 28 540 37T557 60Q559 67 562 68T577 70Q597 70 597 62Q597 56 591 43Q579 19 556 5T512 -10H505Q438 -10 414 62L411 69L400 61Q390 53 370 41T325 18T267 -2T203 -11Q124 -11 79 39T34 156ZM208 26Q257 26 306 47T379 90L403 112Q401 255 396 290Q382 405 304 405Q235 405 183 332Q156 292 139 224T121 120Q121 71 146 49T208 26Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E804-MJMATHI-3B1\" x=\"0\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">\\alpha<\/script>\u548c<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"1.354ex\" height=\"1.994ex\" viewBox=\"0 -755.9 583 858.4\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.238ex;\"><defs><path stroke-width=\"0\" id=\"E805-MJMATHI-3BB\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 673Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E805-MJMATHI-3BB\" x=\"0\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">\\lambda<\/script>\u7684<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"1.452ex\" height=\"1.877ex\" viewBox=\"0 -755.9 625 808.1\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.121ex;\"><defs><path stroke-width=\"0\" id=\"E809-MJMAIN-393\" d=\"M128 619Q121 626 117 628T101 631T58 634H25V680H554V676Q556 670 568 560T582 444V440H542V444Q542 445 538 478T523 545T492 598Q454 634 349 634H334Q264 634 249 633T233 621Q232 618 232 339L233 61Q240 54 245 52T270 48T333 46H360V0H348Q324 3 182 3Q51 3 36 0H25V46H58Q100 47 109 49T128 61V619Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E809-MJMAIN-393\" x=\"0\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">\\Gamma<\/script>\u5206\u5e03\uff0c\u8bb0\u4e3a<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"12.208ex\" height=\"2.577ex\" viewBox=\"0 -806.1 5256.2 1109.7\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E808-MJMATHI-58\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 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720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path stroke-width=\"0\" id=\"E808-MJMATHI-3B1\" d=\"M34 156Q34 270 120 356T309 442Q379 442 421 402T478 304Q484 275 485 237V208Q534 282 560 374Q564 388 566 390T582 393Q603 393 603 385Q603 376 594 346T558 261T497 161L486 147L487 123Q489 67 495 47T514 26Q528 28 540 37T557 60Q559 67 562 68T577 70Q597 70 597 62Q597 56 591 43Q579 19 556 5T512 -10H505Q438 -10 414 62L411 69L400 61Q390 53 370 41T325 18T267 -2T203 -11Q124 -11 79 39T34 156ZM208 26Q257 26 306 47T379 90L403 112Q401 255 396 290Q382 405 304 405Q235 405 183 332Q156 292 139 224T121 120Q121 71 146 49T208 26Z\"><\/path><path stroke-width=\"0\" id=\"E808-MJMAIN-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path stroke-width=\"0\" id=\"E808-MJMATHI-3BB\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 673Z\"><\/path><path stroke-width=\"0\" id=\"E808-MJMAIN-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E808-MJMATHI-58\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E808-MJMAIN-223C\" x=\"1129\" y=\"0\"><\/use><use xlink:href=\"#E808-MJMAIN-393\" x=\"2185\" y=\"0\"><\/use><use xlink:href=\"#E808-MJMAIN-28\" x=\"2810\" y=\"0\"><\/use><use xlink:href=\"#E808-MJMATHI-3B1\" x=\"3199\" y=\"0\"><\/use><use xlink:href=\"#E808-MJMAIN-2C\" x=\"3839\" y=\"0\"><\/use><use xlink:href=\"#E808-MJMATHI-3BB\" x=\"4284\" y=\"0\"><\/use><use xlink:href=\"#E808-MJMAIN-29\" x=\"4867\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">X \\sim \\Gamma(\\alpha, \\lambda)<\/script>.<\/p>\n<blockquote><p><mark>\u8bc1\u660e<\/mark><\/p>\n<\/blockquote>\n<p><strong>\u5b9a\u7406 0.4<\/strong> \u82e5\u968f\u673a\u53d8\u91cf<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"12.208ex\" height=\"2.577ex\" viewBox=\"0 -806.1 5256.2 1109.7\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E808-MJMATHI-58\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 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367Q260 367 296 349T362 304T421 252T484 208T554 189Q616 189 655 236T694 338Q694 350 698 358T708 367Q722 367 722 334Q722 260 677 197T562 134H554Q517 134 481 152T414 196T355 248T292 293T223 311Q179 311 145 286Q109 257 96 218T80 156T69 133Q55 133 55 166Z\"><\/path><path stroke-width=\"0\" id=\"E808-MJMAIN-393\" d=\"M128 619Q121 626 117 628T101 631T58 634H25V680H554V676Q556 670 568 560T582 444V440H542V444Q542 445 538 478T523 545T492 598Q454 634 349 634H334Q264 634 249 633T233 621Q232 618 232 339L233 61Q240 54 245 52T270 48T333 46H360V0H348Q324 3 182 3Q51 3 36 0H25V46H58Q100 47 109 49T128 61V619Z\"><\/path><path stroke-width=\"0\" id=\"E808-MJMAIN-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path stroke-width=\"0\" id=\"E808-MJMATHI-3B1\" d=\"M34 156Q34 270 120 356T309 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293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 673Z\"><\/path><path stroke-width=\"0\" id=\"E808-MJMAIN-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E808-MJMATHI-58\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E808-MJMAIN-223C\" x=\"1129\" y=\"0\"><\/use><use xlink:href=\"#E808-MJMAIN-393\" x=\"2185\" y=\"0\"><\/use><use xlink:href=\"#E808-MJMAIN-28\" x=\"2810\" y=\"0\"><\/use><use xlink:href=\"#E808-MJMATHI-3B1\" x=\"3199\" y=\"0\"><\/use><use xlink:href=\"#E808-MJMAIN-2C\" x=\"3839\" y=\"0\"><\/use><use xlink:href=\"#E808-MJMATHI-3BB\" x=\"4284\" y=\"0\"><\/use><use xlink:href=\"#E808-MJMAIN-29\" x=\"4867\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">X \\sim \\Gamma(\\alpha, \\lambda)<\/script>\uff0c\u5219\u6709<\/p>\n<div contenteditable=\"true\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n115\" cid=\"n115\" mdtype=\"math_block\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><div class=\"MathJax_SVG_Display\"><span class=\"MathJax_SVG\" id=\"MathJax-Element-559-Frame\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"78.56ex\" height=\"3.044ex\" viewBox=\"0 -906.7 33824.5 1310.7\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.938ex; max-width: 100%;\" class=\"in-text-selection\"><defs><path stroke-width=\"0\" id=\"E710-MJMAIN-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 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19 556 5T512 -10H505Q438 -10 414 62L411 69L400 61Q390 53 370 41T325 18T267 -2T203 -11Q124 -11 79 39T34 156ZM208 26Q257 26 306 47T379 90L403 112Q401 255 396 290Q382 405 304 405Q235 405 183 332Q156 292 139 224T121 120Q121 71 146 49T208 26Z\"><\/path><path stroke-width=\"0\" id=\"E710-MJMAIN-2F\" d=\"M423 750Q432 750 438 744T444 730Q444 725 271 248T92 -240Q85 -250 75 -250Q68 -250 62 -245T56 -231Q56 -221 230 257T407 740Q411 750 423 750Z\"><\/path><path stroke-width=\"0\" id=\"E710-MJMATHI-3BB\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 673Z\"><\/path><path stroke-width=\"0\" id=\"E710-MJMAIN-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 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46 61 46H67Q94 46 127 49Q141 52 146 61Q149 65 218 339T287 628Q287 635 230 637ZM630 554Q630 586 609 608T523 636Q521 636 500 636T462 637H440Q393 637 386 627Q385 624 352 494T319 361Q319 360 388 360Q466 361 492 367Q556 377 592 426Q608 449 619 486T630 554Z\"><\/path><path stroke-width=\"0\" id=\"E710-MJMAIN-32\" d=\"M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><g transform=\"translate(32046,0)\"><g id=\"mjx-eqn-15\" transform=\"translate(0,-67)\"><use xlink:href=\"#E710-MJMAIN-28\"><\/use><use xlink:href=\"#E710-MJMAIN-31\" x=\"389\" y=\"0\"><\/use><use xlink:href=\"#E710-MJMAIN-35\" x=\"889\" y=\"0\"><\/use><use xlink:href=\"#E710-MJMAIN-29\" x=\"1389\" y=\"0\"><\/use><\/g><\/g><g transform=\"translate(10041,0)\"><g transform=\"translate(-15,0)\"><g transform=\"translate(0,-67)\"><use xlink:href=\"#E710-MJMATHI-45\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E710-MJMAIN-5B\" x=\"764\" y=\"0\"><\/use><use xlink:href=\"#E710-MJMATHI-58\" x=\"1042\" y=\"0\"><\/use><use xlink:href=\"#E710-MJMAIN-5D\" x=\"1894\" y=\"0\"><\/use><use xlink:href=\"#E710-MJMAIN-3D\" x=\"2449\" y=\"0\"><\/use><use xlink:href=\"#E710-MJMATHI-3B1\" x=\"3505\" y=\"0\"><\/use><use xlink:href=\"#E710-MJMAIN-2F\" x=\"4145\" y=\"0\"><\/use><use xlink:href=\"#E710-MJMATHI-3BB\" x=\"4645\" y=\"0\"><\/use><use xlink:href=\"#E710-MJMAIN-2C\" x=\"5228\" y=\"0\"><\/use><use xlink:href=\"#E710-MJMATHI-56\" x=\"6673\" y=\"0\"><\/use><use xlink:href=\"#E710-MJMATHI-41\" x=\"7442\" y=\"0\"><\/use><use xlink:href=\"#E710-MJMATHI-52\" x=\"8192\" y=\"0\"><\/use><use xlink:href=\"#E710-MJMAIN-28\" x=\"8951\" y=\"0\"><\/use><use xlink:href=\"#E710-MJMATHI-58\" x=\"9340\" y=\"0\"><\/use><use xlink:href=\"#E710-MJMAIN-29\" x=\"10192\" y=\"0\"><\/use><use xlink:href=\"#E710-MJMAIN-3D\" x=\"10859\" y=\"0\"><\/use><use xlink:href=\"#E710-MJMATHI-3B1\" x=\"11914\" y=\"0\"><\/use><use xlink:href=\"#E710-MJMAIN-2F\" x=\"12554\" y=\"0\"><\/use><g transform=\"translate(13054,0)\"><use xlink:href=\"#E710-MJMATHI-3BB\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E710-MJMAIN-32\" x=\"824\" y=\"583\"><\/use><\/g><\/g><\/g><\/g><\/g><\/svg><\/span><\/div><script type=\"math\/tex; mode=display\" id=\"MathJax-Element-559\">E[X] = \\alpha\/\\lambda, \\quad VAR(X) = \\alpha\/\\lambda^2<\/script><\/div><\/div>\n<blockquote><p><mark>\u8bc1\u660e<\/mark><\/p>\n<\/blockquote>\n<p><strong>\u5b9a\u7406 0.5<\/strong> (<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"1.452ex\" height=\"1.877ex\" viewBox=\"0 -755.9 625 808.1\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.121ex;\"><defs><path stroke-width=\"0\" id=\"E809-MJMAIN-393\" d=\"M128 619Q121 626 117 628T101 631T58 634H25V680H554V676Q556 670 568 560T582 444V440H542V444Q542 445 538 478T523 545T492 598Q454 634 349 634H334Q264 634 249 633T233 621Q232 618 232 339L233 61Q240 54 245 52T270 48T333 46H360V0H348Q324 3 182 3Q51 3 36 0H25V46H58Q100 47 109 49T128 61V619Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E809-MJMAIN-393\" x=\"0\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">\\Gamma<\/script>\u5206\u5e03\u7684\u53ef\u52a0\u6027) \u82e5\u968f\u673a\u53d8\u91cf<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: 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y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">Y \\sim \\Gamma(\\alpha_2, \\lambda)<\/script>\uff0c\u4e14<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"1.979ex\" height=\"1.877ex\" viewBox=\"0 -755.9 852 808.1\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.121ex;\"><defs><path stroke-width=\"0\" id=\"E812-MJMATHI-58\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 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y=\"0\"><\/use><use xlink:href=\"#E814-MJMATHI-3BB\" x=\"9039\" y=\"0\"><\/use><use xlink:href=\"#E814-MJMAIN-29\" x=\"9622\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">X + Y \\sim \\Gamma(\\alpha_1 + \\alpha_2, \\lambda)<\/script>.<\/p>\n<p>\u53e6\u5916\uff0c\u5bf9\u6bd4\u6307\u6570\u5206\u5e03\u548c\u4f3d\u9a6c\u5206\u5e03\u7684\u5bc6\u5ea6\u51fd\u6570\u5f62\u5f0f\uff0c\u6613\u77e5<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"14.147ex\" height=\"2.577ex\" viewBox=\"0 -806.1 6091.2 1109.7\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E815-MJMAIN-393\" d=\"M128 619Q121 626 117 628T101 631T58 634H25V680H554V676Q556 670 568 560T582 444V440H542V444Q542 445 538 478T523 545T492 598Q454 634 349 634H334Q264 634 249 633T233 621Q232 618 232 339L233 61Q240 54 245 52T270 48T333 46H360V0H348Q324 3 182 3Q51 3 36 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d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 673Z\"><\/path><path stroke-width=\"0\" id=\"E815-MJMAIN-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path stroke-width=\"0\" id=\"E815-MJMAIN-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path stroke-width=\"0\" id=\"E815-MJMATHI-65\" d=\"M39 168Q39 225 58 272T107 350T174 402T244 433T307 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xlink:href=\"#E815-MJMAIN-28\" x=\"4730\" y=\"0\"><\/use><use xlink:href=\"#E815-MJMATHI-3BB\" x=\"5119\" y=\"0\"><\/use><use xlink:href=\"#E815-MJMAIN-29\" x=\"5702\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">\\Gamma(1, \\lambda) = e(\\lambda)<\/script><\/p>\n<h3>4. \u4e09\u5927\u62bd\u6837\u5206\u5e03<\/h3>\n<h4>\uff081\uff09<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"2.507ex\" height=\"2.811ex\" viewBox=\"0 -906.7 1079.6 1210.2\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E872-MJMATHI-3C7\" d=\"M576 -125Q576 -147 547 -175T487 -204H476Q394 -204 363 -157Q334 -114 293 26L284 59Q283 58 248 19T170 -66T92 -151T53 -191Q49 -194 43 -194Q36 -194 31 -189T25 -177T38 -154T151 -30L272 102L265 131Q189 405 135 405Q104 405 87 358Q86 351 68 351Q48 351 48 361Q48 369 56 386T89 423T148 442Q224 442 258 400Q276 375 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x=\"885\" y=\"513\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">\\chi^2<\/script> \u5206\u5e03<\/h4>\n<p><strong>\u5b9a\u4e49 0.12<\/strong> \u82e5<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"15.301ex\" height=\"2.344ex\" viewBox=\"0 -755.9 6588 1009.2\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.588ex;\"><defs><path stroke-width=\"0\" id=\"E817-MJMATHI-58\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 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xlink:href=\"#E817-MJMAIN-32\" x=\"1170\" y=\"-213\"><\/use><\/g><use xlink:href=\"#E817-MJMAIN-2C\" x=\"3007\" y=\"0\"><\/use><use xlink:href=\"#E817-MJMAIN-2026\" x=\"3452\" y=\"0\"><\/use><use xlink:href=\"#E817-MJMAIN-2C\" x=\"4791\" y=\"0\"><\/use><g transform=\"translate(5235,0)\"><use xlink:href=\"#E817-MJMATHI-58\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E817-MJMATHI-6E\" x=\"1170\" y=\"-213\"><\/use><\/g><\/g><\/svg><\/span><script type=\"math\/tex\">X_1, X_2, \\dots, X_n<\/script>\u662f\u6765\u81ea\u603b\u4f53<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"12.512ex\" height=\"2.694ex\" viewBox=\"0 -856.4 5387.2 1160\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E831-MJMATHI-58\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 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666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path stroke-width=\"0\" id=\"E831-MJMAIN-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E831-MJMATHI-58\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E831-MJMAIN-223C\" x=\"1129\" y=\"0\"><\/use><use xlink:href=\"#E831-MJCAL-4E\" x=\"2185\" y=\"0\"><\/use><use xlink:href=\"#E831-MJMAIN-28\" x=\"3164\" y=\"0\"><\/use><use xlink:href=\"#E831-MJMAIN-30\" x=\"3553\" y=\"0\"><\/use><use xlink:href=\"#E831-MJMAIN-2C\" x=\"4053\" y=\"0\"><\/use><use xlink:href=\"#E831-MJMAIN-31\" x=\"4498\" y=\"0\"><\/use><use xlink:href=\"#E831-MJMAIN-29\" x=\"4998\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">X \\sim \\mathcal{N}(0, 1)<\/script>\u7684\u4e00\u4e2a\u6837\u672c\uff0c\u79f0<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"13.656ex\" height=\"3.044ex\" viewBox=\"0 -906.7 5879.7 1310.7\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.938ex;\"><defs><path stroke-width=\"0\" id=\"E819-MJMATHI-59\" d=\"M66 637Q54 637 49 637T39 638T32 641T30 647T33 664T42 682Q44 683 56 683Q104 680 165 680Q288 680 306 683H316Q322 677 322 674T320 656Q316 643 310 637H298Q242 637 242 624Q242 619 292 477T343 333L346 336Q350 340 358 349T379 373T411 410T454 461Q546 568 561 587T577 618Q577 634 545 637Q528 637 528 647Q528 649 530 661Q533 676 535 679T549 683Q551 683 578 682T657 680Q684 680 713 681T746 682Q763 682 763 673Q763 669 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357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path stroke-width=\"0\" id=\"E819-MJMAIN-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path stroke-width=\"0\" id=\"E819-MJMATHI-58\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path stroke-width=\"0\" id=\"E819-MJMAIN-32\" d=\"M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E819-MJMATHI-59\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E819-MJMAIN-3D\" x=\"1040\" y=\"0\"><\/use><g transform=\"translate(2096,0)\"><use xlink:href=\"#E819-MJSZ1-2211\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E819-MJMATHI-6E\" x=\"1493\" y=\"674\"><\/use><g transform=\"translate(1056,-286)\"><use transform=\"scale(0.707)\" xlink:href=\"#E819-MJMATHI-69\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E819-MJMAIN-3D\" x=\"345\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E819-MJMAIN-31\" x=\"1123\" y=\"0\"><\/use><\/g><\/g><g transform=\"translate(4566,0)\"><use xlink:href=\"#E819-MJMATHI-58\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E819-MJMAIN-32\" x=\"1215\" y=\"487\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E819-MJMATHI-69\" x=\"1170\" y=\"-429\"><\/use><\/g><\/g><\/svg><\/span><script type=\"math\/tex\">Y = \\sum_{i=1}^n X_i^2<\/script>\u4e3a\u670d\u4ece\u81ea\u7531\u5ea6\u4e3a<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"1.394ex\" height=\"1.41ex\" viewBox=\"0 -504.6 600 607.1\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.238ex;\"><defs><path stroke-width=\"0\" id=\"E839-MJMATHI-6E\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E839-MJMATHI-6E\" x=\"0\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">n<\/script>\u7684<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"2.507ex\" height=\"2.811ex\" viewBox=\"0 -906.7 1079.6 1210.2\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E872-MJMATHI-3C7\" d=\"M576 -125Q576 -147 547 -175T487 -204H476Q394 -204 363 -157Q334 -114 293 26L284 59Q283 58 248 19T170 -66T92 -151T53 -191Q49 -194 43 -194Q36 -194 31 -189T25 -177T38 -154T151 -30L272 102L265 131Q189 405 135 405Q104 405 87 358Q86 351 68 351Q48 351 48 361Q48 369 56 386T89 423T148 442Q224 442 258 400Q276 375 297 320T330 222L341 180Q344 180 455 303T573 429Q579 431 582 431Q600 431 600 414Q600 407 587 392T477 270Q356 138 353 134L362 102Q392 -10 428 -89T490 -168Q504 -168 517 -156T536 -126Q539 -116 543 -115T557 -114T571 -115Q576 -118 576 -125Z\"><\/path><path stroke-width=\"0\" id=\"E872-MJMAIN-32\" d=\"M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E872-MJMATHI-3C7\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E872-MJMAIN-32\" x=\"885\" y=\"513\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">\\chi^2<\/script>\u5206\u5e03\uff0c\u8bb0\u4e3a<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"10.577ex\" height=\"2.811ex\" viewBox=\"0 -906.7 4554.1 1210.2\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E847-MJMATHI-59\" d=\"M66 637Q54 637 49 637T39 638T32 641T30 647T33 664T42 682Q44 683 56 683Q104 680 165 680Q288 680 306 683H316Q322 677 322 674T320 656Q316 643 310 637H298Q242 637 242 624Q242 619 292 477T343 333L346 336Q350 340 358 349T379 373T411 410T454 461Q546 568 561 587T577 618Q577 634 545 637Q528 637 528 647Q528 649 530 661Q533 676 535 679T549 683Q551 683 578 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-194 43 -194Q36 -194 31 -189T25 -177T38 -154T151 -30L272 102L265 131Q189 405 135 405Q104 405 87 358Q86 351 68 351Q48 351 48 361Q48 369 56 386T89 423T148 442Q224 442 258 400Q276 375 297 320T330 222L341 180Q344 180 455 303T573 429Q579 431 582 431Q600 431 600 414Q600 407 587 392T477 270Q356 138 353 134L362 102Q392 -10 428 -89T490 -168Q504 -168 517 -156T536 -126Q539 -116 543 -115T557 -114T571 -115Q576 -118 576 -125Z\"><\/path><path stroke-width=\"0\" id=\"E847-MJMAIN-32\" d=\"M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z\"><\/path><path stroke-width=\"0\" id=\"E847-MJMAIN-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path stroke-width=\"0\" id=\"E847-MJMATHI-6E\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path stroke-width=\"0\" id=\"E847-MJMAIN-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E847-MJMATHI-59\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E847-MJMAIN-223C\" x=\"1040\" y=\"0\"><\/use><g transform=\"translate(2096,0)\"><use xlink:href=\"#E847-MJMATHI-3C7\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E847-MJMAIN-32\" x=\"885\" y=\"513\"><\/use><\/g><use xlink:href=\"#E847-MJMAIN-28\" x=\"3176\" y=\"0\"><\/use><use xlink:href=\"#E847-MJMATHI-6E\" x=\"3565\" y=\"0\"><\/use><use xlink:href=\"#E847-MJMAIN-29\" x=\"4165\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">Y \\sim \\chi^2(n)<\/script>.<\/p>\n<p>\u968f\u673a\u53d8\u91cf<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"1.772ex\" height=\"1.877ex\" viewBox=\"0 -755.9 763 808.1\" role=\"img\" focusable=\"false\" style=\"vertical-align: 0.002ex; margin-bottom: -0.124ex;\"><defs><path stroke-width=\"0\" id=\"E823-MJMATHI-59\" d=\"M66 637Q54 637 49 637T39 638T32 641T30 647T33 664T42 682Q44 683 56 683Q104 680 165 680Q288 680 306 683H316Q322 677 322 674T320 656Q316 643 310 637H298Q242 637 242 624Q242 619 292 477T343 333L346 336Q350 340 358 349T379 373T411 410T454 461Q546 568 561 587T577 618Q577 634 545 637Q528 637 528 647Q528 649 530 661Q533 676 535 679T549 683Q551 683 578 682T657 680Q684 680 713 681T746 682Q763 682 763 673Q763 669 760 657T755 643Q753 637 734 637Q662 632 617 587Q608 578 477 424L348 273L322 169Q295 62 295 57Q295 46 363 46Q379 46 384 45T390 35Q390 33 388 23Q384 6 382 4T366 1Q361 1 324 1T232 2Q170 2 138 2T102 1Q84 1 84 9Q84 14 87 24Q88 27 89 30T90 35T91 39T93 42T96 44T101 45T107 45T116 46T129 46Q168 47 180 50T198 63Q201 68 227 171L252 274L129 623Q128 624 127 625T125 627T122 629T118 631T113 633T105 634T96 635T83 636T66 637Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E823-MJMATHI-59\" x=\"0\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">Y<\/script>\u7684\u6982\u7387\u5bc6\u5ea6\u51fd\u6570\u4e3a\uff1a<\/p>\n<div contenteditable=\"true\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n124\" cid=\"n124\" mdtype=\"math_block\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><div class=\"MathJax_SVG_Display\"><span class=\"MathJax_SVG\" id=\"MathJax-Element-560-Frame\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"78.56ex\" height=\"8.414ex\" viewBox=\"0 -2062.6 33824.5 3622.7\" role=\"img\" focusable=\"false\" style=\"vertical-align: -3.623ex; max-width: 100%;\" class=\"in-text-selection\"><defs><path stroke-width=\"0\" id=\"E711-MJMAIN-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path stroke-width=\"0\" id=\"E711-MJMAIN-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path stroke-width=\"0\" id=\"E711-MJMAIN-36\" d=\"M42 313Q42 476 123 571T303 666Q372 666 402 630T432 550Q432 525 418 510T379 495Q356 495 341 509T326 548Q326 592 373 601Q351 623 311 626Q240 626 194 566Q147 500 147 364L148 360Q153 366 156 373Q197 433 263 433H267Q313 433 348 414Q372 400 396 374T435 317Q456 268 456 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transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E824-MJMATHI-58\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E824-MJMAIN-223C\" x=\"1129\" y=\"0\"><\/use><g transform=\"translate(2185,0)\"><use xlink:href=\"#E824-MJMATHI-3C7\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E824-MJMAIN-32\" x=\"885\" y=\"513\"><\/use><\/g><use xlink:href=\"#E824-MJMAIN-28\" x=\"3265\" y=\"0\"><\/use><use xlink:href=\"#E824-MJMATHI-6E\" x=\"3654\" y=\"0\"><\/use><use xlink:href=\"#E824-MJMAIN-29\" x=\"4254\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">X \\sim \\chi^2(n)<\/script>\uff0c\u5219<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"9.31ex\" height=\"2.577ex\" viewBox=\"0 -806.1 4008.6 1109.7\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E825-MJAMS-45\" d=\"M12 666Q12 675 24 683H582Q590 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21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E825-MJAMS-45\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E825-MJMAIN-5B\" x=\"667\" y=\"0\"><\/use><use xlink:href=\"#E825-MJMATHI-58\" x=\"945\" y=\"0\"><\/use><use xlink:href=\"#E825-MJMAIN-5D\" x=\"1797\" y=\"0\"><\/use><use xlink:href=\"#E825-MJMAIN-3D\" x=\"2352\" y=\"0\"><\/use><use xlink:href=\"#E825-MJMATHI-6E\" x=\"3408\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">\\mathbb{E}[X] = n<\/script>\u548c<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"13.818ex\" height=\"2.577ex\" viewBox=\"0 -806.1 5949.6 1109.7\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E826-MJAMS-56\" d=\"M316 683Q327 676 327 666Q327 648 302 648Q272 642 258 628Q249 621 249 608Q252 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151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E826-MJAMS-56\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E826-MJAMS-41\" x=\"722\" y=\"0\"><\/use><use xlink:href=\"#E826-MJAMS-52\" x=\"1444\" y=\"0\"><\/use><use xlink:href=\"#E826-MJMAIN-28\" x=\"2166\" y=\"0\"><\/use><use xlink:href=\"#E826-MJMATHI-78\" x=\"2555\" y=\"0\"><\/use><use xlink:href=\"#E826-MJMAIN-29\" x=\"3127\" y=\"0\"><\/use><use xlink:href=\"#E826-MJMAIN-3D\" x=\"3793\" y=\"0\"><\/use><use xlink:href=\"#E826-MJMAIN-32\" x=\"4849\" y=\"0\"><\/use><use xlink:href=\"#E826-MJMATHI-6E\" x=\"5349\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">\\mathbb{VAR}(x) = 2n<\/script><\/p>\n<\/li>\n<li><p>\u82e5\u968f\u673a\u53d8\u91cf<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"11.43ex\" height=\"2.811ex\" viewBox=\"0 -906.7 4921.1 1210.2\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E846-MJMATHI-58\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path stroke-width=\"0\" id=\"E846-MJMAIN-223C\" d=\"M55 166Q55 241 101 304T222 367Q260 367 296 349T362 304T421 252T484 208T554 189Q616 189 655 236T694 338Q694 350 698 358T708 367Q722 367 722 334Q722 260 677 197T562 134H554Q517 134 481 152T414 196T355 248T292 293T223 311Q179 311 145 286Q109 257 96 218T80 156T69 133Q55 133 55 166Z\"><\/path><path stroke-width=\"0\" id=\"E846-MJMATHI-3C7\" d=\"M576 -125Q576 -147 547 -175T487 -204H476Q394 -204 363 -157Q334 -114 293 26L284 59Q283 58 248 19T170 -66T92 -151T53 -191Q49 -194 43 -194Q36 -194 31 -189T25 -177T38 -154T151 -30L272 102L265 131Q189 405 135 405Q104 405 87 358Q86 351 68 351Q48 351 48 361Q48 369 56 386T89 423T148 442Q224 442 258 400Q276 375 297 320T330 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d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E846-MJMATHI-58\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E846-MJMAIN-223C\" x=\"1129\" y=\"0\"><\/use><g transform=\"translate(2185,0)\"><use xlink:href=\"#E846-MJMATHI-3C7\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E846-MJMAIN-32\" x=\"885\" y=\"513\"><\/use><\/g><use xlink:href=\"#E846-MJMAIN-28\" x=\"3265\" y=\"0\"><\/use><use xlink:href=\"#E846-MJMATHI-6D\" x=\"3654\" y=\"0\"><\/use><use xlink:href=\"#E846-MJMAIN-29\" x=\"4532\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">X \\sim \\chi^2(m)<\/script>\u548c<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"10.577ex\" height=\"2.811ex\" viewBox=\"0 -906.7 4554.1 1210.2\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E828-MJMATHI-59\" d=\"M66 637Q54 637 49 637T39 638T32 641T30 647T33 664T42 682Q44 683 56 683Q104 680 165 680Q288 680 306 683H316Q322 677 322 674T320 656Q316 643 310 637H298Q242 637 242 624Q242 619 292 477T343 333L346 336Q350 340 358 349T379 373T411 410T454 461Q546 568 561 587T577 618Q577 634 545 637Q528 637 528 647Q528 649 530 661Q533 676 535 679T549 683Q551 683 578 682T657 680Q684 680 713 681T746 682Q763 682 763 673Q763 669 760 657T755 643Q753 637 734 637Q662 632 617 587Q608 578 477 424L348 273L322 169Q295 62 295 57Q295 46 363 46Q379 46 384 45T390 35Q390 33 388 23Q384 6 382 4T366 1Q361 1 324 1T232 2Q170 2 138 2T102 1Q84 1 84 9Q84 14 87 24Q88 27 89 30T90 35T91 39T93 42T96 44T101 45T107 45T116 46T129 46Q168 47 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y=\"0\"><\/use><use xlink:href=\"#E828-MJMAIN-223C\" x=\"1040\" y=\"0\"><\/use><g transform=\"translate(2096,0)\"><use xlink:href=\"#E828-MJMATHI-3C7\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E828-MJMAIN-32\" x=\"885\" y=\"513\"><\/use><\/g><use xlink:href=\"#E828-MJMAIN-28\" x=\"3176\" y=\"0\"><\/use><use xlink:href=\"#E828-MJMATHI-6E\" x=\"3565\" y=\"0\"><\/use><use xlink:href=\"#E828-MJMAIN-29\" x=\"4165\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">Y\\sim \\chi^2(n)<\/script>\u76f8\u4e92\u72ec\u7acb\uff0c\u5219<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"20.274ex\" height=\"2.811ex\" viewBox=\"0 -906.7 8729 1210.2\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E829-MJMATHI-58\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 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130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path stroke-width=\"0\" id=\"E829-MJMAIN-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E829-MJMATHI-58\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E829-MJMAIN-2B\" x=\"1074\" y=\"0\"><\/use><use xlink:href=\"#E829-MJMATHI-59\" x=\"2074\" y=\"0\"><\/use><use xlink:href=\"#E829-MJMAIN-223C\" x=\"3115\" y=\"0\"><\/use><g transform=\"translate(4171,0)\"><use xlink:href=\"#E829-MJMATHI-3C7\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E829-MJMAIN-32\" x=\"885\" y=\"513\"><\/use><\/g><use xlink:href=\"#E829-MJMAIN-28\" x=\"5250\" y=\"0\"><\/use><use xlink:href=\"#E829-MJMATHI-6D\" x=\"5639\" y=\"0\"><\/use><use xlink:href=\"#E829-MJMAIN-2B\" x=\"6739\" y=\"0\"><\/use><use xlink:href=\"#E829-MJMATHI-6E\" x=\"7739\" y=\"0\"><\/use><use xlink:href=\"#E829-MJMAIN-29\" x=\"8339\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">X + Y \\sim \\chi^2(m + n)<\/script><\/p>\n<\/li>\n<li><p>\u63a8\u5e7f\u547d\u9898\uff1a\u82e5\u968f\u673a\u53d8\u91cf<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"12.512ex\" height=\"2.694ex\" viewBox=\"0 -856.4 5387.2 1160\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E831-MJMATHI-58\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path stroke-width=\"0\" id=\"E831-MJMAIN-223C\" d=\"M55 166Q55 241 101 304T222 367Q260 367 296 349T362 304T421 252T484 208T554 189Q616 189 655 236T694 338Q694 350 698 358T708 367Q722 367 722 334Q722 260 677 197T562 134H554Q517 134 481 152T414 196T355 248T292 293T223 311Q179 311 145 286Q109 257 96 218T80 156T69 133Q55 133 55 166Z\"><\/path><path stroke-width=\"0\" id=\"E831-MJCAL-4E\" d=\"M343 705Q358 705 358 698Q360 696 370 658T411 524T484 319Q536 174 590 82L595 73L615 152Q646 274 683 407Q729 571 752 637T799 727Q852 780 937 788Q939 788 947 788T958 789H962Q979 789 979 765Q979 722 951 692Q942 683 924 683Q888 681 859 672T818 654T803 639Q784 608 708 322T631 15Q631 14 630 15Q630 17 629 15Q628 14 628 12Q621 -4 601 -17T560 -31Q550 -31 546 -28T530 -7Q484 67 458 123T398 272Q352 392 314 514L306 535V534Q306 533 296 488T272 379T234 239T185 100T127 -7T61 -50Q34 -50 4 -34T-27 8Q-27 33 -12 61T18 90Q21 90 36 77T87 57H92Q109 57 123 78T162 173Q206 299 232 417T265 599T276 667Q284 681 304 693T343 705Z\"><\/path><path stroke-width=\"0\" id=\"E831-MJMAIN-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path stroke-width=\"0\" id=\"E831-MJMAIN-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path stroke-width=\"0\" id=\"E831-MJMAIN-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path stroke-width=\"0\" id=\"E831-MJMAIN-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path stroke-width=\"0\" id=\"E831-MJMAIN-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E831-MJMATHI-58\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E831-MJMAIN-223C\" x=\"1129\" y=\"0\"><\/use><use xlink:href=\"#E831-MJCAL-4E\" x=\"2185\" y=\"0\"><\/use><use xlink:href=\"#E831-MJMAIN-28\" x=\"3164\" y=\"0\"><\/use><use xlink:href=\"#E831-MJMAIN-30\" x=\"3553\" y=\"0\"><\/use><use xlink:href=\"#E831-MJMAIN-2C\" x=\"4053\" y=\"0\"><\/use><use xlink:href=\"#E831-MJMAIN-31\" x=\"4498\" y=\"0\"><\/use><use xlink:href=\"#E831-MJMAIN-29\" x=\"4998\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">X \\sim \\mathcal{N}(0, 1)<\/script>\uff0c\u5219<\/p>\n<div contenteditable=\"true\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n135\" cid=\"n135\" mdtype=\"math_block\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><div class=\"MathJax_SVG_Display\"><span class=\"MathJax_SVG\" id=\"MathJax-Element-561-Frame\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"75.058ex\" height=\"5.846ex\" viewBox=\"0 -1509.8 32316.7 2517\" role=\"img\" focusable=\"false\" style=\"vertical-align: -2.339ex; max-width: 100%;\" class=\"in-text-selection\"><defs><path 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xlink:href=\"#E712-MJMATHI-6B\" x=\"1215\" y=\"583\"><\/use><\/g><use xlink:href=\"#E712-MJMAIN-5D\" x=\"2272\" y=\"0\"><\/use><use xlink:href=\"#E712-MJMAIN-3D\" x=\"2828\" y=\"0\"><\/use><g transform=\"translate(3884,0)\"><use xlink:href=\"#E712-MJSZ3-7B\"><\/use><g transform=\"translate(917,0)\"><g transform=\"translate(-15,0)\"><g transform=\"translate(0,575)\"><use xlink:href=\"#E712-MJMAIN-28\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E712-MJMATHI-6B\" x=\"389\" y=\"0\"><\/use><use xlink:href=\"#E712-MJMAIN-2212\" x=\"1132\" y=\"0\"><\/use><use xlink:href=\"#E712-MJMAIN-31\" x=\"2132\" y=\"0\"><\/use><use xlink:href=\"#E712-MJMAIN-29\" x=\"2632\" y=\"0\"><\/use><use xlink:href=\"#E712-MJMAIN-21\" x=\"3021\" y=\"0\"><\/use><use xlink:href=\"#E712-MJMAIN-21\" x=\"3299\" y=\"0\"><\/use><use xlink:href=\"#E712-MJMAIN-2C\" x=\"3577\" y=\"0\"><\/use><\/g><g transform=\"translate(0,-675)\"><use xlink:href=\"#E712-MJMAIN-30\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E712-MJMAIN-2C\" x=\"500\" y=\"0\"><\/use><\/g><\/g><g transform=\"translate(4840,0)\"><g transform=\"translate(0,575)\"><use xlink:href=\"#E712-MJMATHI-6B\" x=\"0\" y=\"0\"><\/use><g transform=\"translate(521,0)\"><text font-family=\"STIXGeneral, 'PingFang SC', serif\" stroke=\"none\" transform=\"scale(50.259) matrix(1 0 0 -1 0 0)\">\u4e3a<\/text><g transform=\"translate(804,0)\"><text font-family=\"STIXGeneral, 'PingFang SC', serif\" stroke=\"none\" transform=\"scale(50.259) matrix(1 0 0 -1 0 0)\">\u5076<\/text><\/g><g transform=\"translate(1608,0)\"><text font-family=\"STIXGeneral, 'PingFang SC', serif\" stroke=\"none\" transform=\"scale(50.259) matrix(1 0 0 -1 0 0)\">\u6570<\/text><\/g><\/g><\/g><g transform=\"translate(0,-675)\"><use xlink:href=\"#E712-MJMATHI-6B\" x=\"0\" y=\"0\"><\/use><g transform=\"translate(521,0)\"><text font-family=\"STIXGeneral, 'PingFang SC', serif\" stroke=\"none\" transform=\"scale(50.259) matrix(1 0 0 -1 0 0)\">\u4e3a<\/text><g transform=\"translate(804,0)\"><text font-family=\"STIXGeneral, 'PingFang SC', serif\" stroke=\"none\" transform=\"scale(50.259) matrix(1 0 0 -1 0 0)\">\u5947<\/text><\/g><g transform=\"translate(1608,0)\"><text font-family=\"STIXGeneral, 'PingFang SC', serif\" stroke=\"none\" transform=\"scale(50.259) matrix(1 0 0 -1 0 0)\">\u6570<\/text><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/span><\/div><script type=\"math\/tex; mode=display\" id=\"MathJax-Element-561\">\\mathbb{E}[X^k] =\n\\begin{cases}\n(k - 1)!!, & k \\text{\u4e3a\u5076\u6570}\\\\\n0, & k \\text{\u4e3a\u5947\u6570}\n\\end{cases}<\/script><\/div><\/div>\n<\/li>\n\n<\/ul>\n<h4>\uff082\uff09t \u5206\u5e03<\/h4>\n<p><strong>\u5b9a\u4e49 0.13<\/strong> \u968f\u673a\u53d8\u91cf<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"12.512ex\" height=\"2.694ex\" viewBox=\"0 -856.4 5387.2 1160\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E831-MJMATHI-58\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 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599T276 667Q284 681 304 693T343 705Z\"><\/path><path stroke-width=\"0\" id=\"E831-MJMAIN-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path stroke-width=\"0\" id=\"E831-MJMAIN-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><path stroke-width=\"0\" id=\"E831-MJMAIN-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path stroke-width=\"0\" id=\"E831-MJMAIN-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path stroke-width=\"0\" id=\"E831-MJMAIN-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E831-MJMATHI-58\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E831-MJMAIN-223C\" x=\"1129\" y=\"0\"><\/use><use xlink:href=\"#E831-MJCAL-4E\" x=\"2185\" y=\"0\"><\/use><use xlink:href=\"#E831-MJMAIN-28\" x=\"3164\" y=\"0\"><\/use><use xlink:href=\"#E831-MJMAIN-30\" x=\"3553\" y=\"0\"><\/use><use xlink:href=\"#E831-MJMAIN-2C\" x=\"4053\" y=\"0\"><\/use><use xlink:href=\"#E831-MJMAIN-31\" x=\"4498\" y=\"0\"><\/use><use xlink:href=\"#E831-MJMAIN-29\" x=\"4998\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">X \\sim \\mathcal{N}(0, 1)<\/script>\u548c<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"10.577ex\" height=\"2.811ex\" viewBox=\"0 -906.7 4554.1 1210.2\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E847-MJMATHI-59\" d=\"M66 637Q54 637 49 637T39 638T32 641T30 647T33 664T42 682Q44 683 56 683Q104 680 165 680Q288 680 306 683H316Q322 677 322 674T320 656Q316 643 310 637H298Q242 637 242 624Q242 619 292 477T343 333L346 336Q350 340 358 349T379 373T411 410T454 461Q546 568 561 587T577 618Q577 634 545 637Q528 637 528 647Q528 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stroke-width=\"0\" id=\"E847-MJMAIN-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path stroke-width=\"0\" id=\"E847-MJMATHI-6E\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path stroke-width=\"0\" id=\"E847-MJMAIN-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E847-MJMATHI-59\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E847-MJMAIN-223C\" x=\"1040\" y=\"0\"><\/use><g transform=\"translate(2096,0)\"><use xlink:href=\"#E847-MJMATHI-3C7\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E847-MJMAIN-32\" x=\"885\" y=\"513\"><\/use><\/g><use xlink:href=\"#E847-MJMAIN-28\" x=\"3176\" y=\"0\"><\/use><use xlink:href=\"#E847-MJMATHI-6E\" x=\"3565\" y=\"0\"><\/use><use xlink:href=\"#E847-MJMAIN-29\" x=\"4165\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">Y \\sim \\chi^2(n)<\/script>\u76f8\u4e92\u72ec\u7acb\uff0c\u5219\u968f\u673a\u53d8\u91cf<\/p>\n<div 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54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path stroke-width=\"0\" id=\"E713-MJMATHI-59\" d=\"M66 637Q54 637 49 637T39 638T32 641T30 647T33 664T42 682Q44 683 56 683Q104 680 165 680Q288 680 306 683H316Q322 677 322 674T320 656Q316 643 310 637H298Q242 637 242 624Q242 619 292 477T343 333L346 336Q350 340 358 349T379 373T411 410T454 461Q546 568 561 587T577 618Q577 634 545 637Q528 637 528 647Q528 649 530 661Q533 676 535 679T549 683Q551 683 578 682T657 680Q684 680 713 681T746 682Q763 682 763 673Q763 669 760 657T755 643Q753 637 734 637Q662 632 617 587Q608 578 477 424L348 273L322 169Q295 62 295 57Q295 46 363 46Q379 46 384 45T390 35Q390 33 388 23Q384 6 382 4T366 1Q361 1 324 1T232 2Q170 2 138 2T102 1Q84 1 84 9Q84 14 87 24Q88 27 89 30T90 35T91 39T93 42T96 44T101 45T107 45T116 46T129 46Q168 47 180 50T198 63Q201 68 227 171L252 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width=\"2983\" height=\"60\" x=\"0\" y=\"220\"><\/rect><use xlink:href=\"#E713-MJMATHI-58\" x=\"1065\" y=\"676\"><\/use><g transform=\"translate(60,-898)\"><use xlink:href=\"#E713-MJSZ1-221A\" x=\"0\" y=\"22\"><\/use><rect stroke=\"none\" width=\"1863\" height=\"60\" x=\"1000\" y=\"812\"><\/rect><g transform=\"translate(1000,0)\"><use xlink:href=\"#E713-MJMATHI-59\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E713-MJMAIN-2F\" x=\"763\" y=\"0\"><\/use><use xlink:href=\"#E713-MJMATHI-6E\" x=\"1263\" y=\"0\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/span><\/div><script type=\"math\/tex; mode=display\" id=\"MathJax-Element-562\">T = \\frac{X}{\\sqrt{Y \/ n}}<\/script><\/div><\/div>\n<p>\u670d\u4ece\u81ea\u7531\u5ea6\u4e3a<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"1.394ex\" height=\"1.41ex\" viewBox=\"0 -504.6 600 607.1\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.238ex;\"><defs><path stroke-width=\"0\" id=\"E839-MJMATHI-6E\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E839-MJMATHI-6E\" x=\"0\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">n<\/script>\u7684<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"0.838ex\" height=\"1.877ex\" viewBox=\"0 -705.6 361 808.1\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.238ex;\"><defs><path stroke-width=\"0\" id=\"E834-MJMATHI-74\" d=\"M26 385Q19 392 19 395Q19 399 22 411T27 425Q29 430 36 430T87 431H140L159 511Q162 522 166 540T173 566T179 586T187 603T197 615T211 624T229 626Q247 625 254 615T261 596Q261 589 252 549T232 470L222 433Q222 431 272 431H323Q330 424 330 420Q330 398 317 385H210L174 240Q135 80 135 68Q135 26 162 26Q197 26 230 60T283 144Q285 150 288 151T303 153H307Q322 153 322 145Q322 142 319 133Q314 117 301 95T267 48T216 6T155 -11Q125 -11 98 4T59 56Q57 64 57 83V101L92 241Q127 382 128 383Q128 385 77 385H26Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E834-MJMATHI-74\" x=\"0\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">t<\/script>\u5206\u5e03\uff0c\u8bb0<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"8.771ex\" height=\"2.577ex\" viewBox=\"0 -806.1 3776.6 1109.7\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E838-MJMATHI-54\" d=\"M40 437Q21 437 21 445Q21 450 37 501T71 602L88 651Q93 669 101 677H569H659Q691 677 697 676T704 667Q704 661 687 553T668 444Q668 437 649 437Q640 437 637 437T631 442L629 445Q629 451 635 490T641 551Q641 586 628 604T573 629Q568 630 515 631Q469 631 457 630T439 622Q438 621 368 343T298 60Q298 48 386 46Q418 46 427 45T436 36Q436 31 433 22Q429 4 424 1L422 0Q419 0 415 0Q410 0 363 1T228 2Q99 2 64 0H49Q43 6 43 9T45 27Q49 40 55 46H83H94Q174 46 189 55Q190 56 191 56Q196 59 201 76T241 233Q258 301 269 344Q339 619 339 625Q339 630 310 630H279Q212 630 191 624Q146 614 121 583T67 467Q60 445 57 441T43 437H40Z\"><\/path><path stroke-width=\"0\" id=\"E838-MJMAIN-223C\" d=\"M55 166Q55 241 101 304T222 367Q260 367 296 349T362 304T421 252T484 208T554 189Q616 189 655 236T694 338Q694 350 698 358T708 367Q722 367 722 334Q722 260 677 197T562 134H554Q517 134 481 152T414 196T355 248T292 293T223 311Q179 311 145 286Q109 257 96 218T80 156T69 133Q55 133 55 166Z\"><\/path><path stroke-width=\"0\" id=\"E838-MJMATHI-74\" d=\"M26 385Q19 392 19 395Q19 399 22 411T27 425Q29 430 36 430T87 431H140L159 511Q162 522 166 540T173 566T179 586T187 603T197 615T211 624T229 626Q247 625 254 615T261 596Q261 589 252 549T232 470L222 433Q222 431 272 431H323Q330 424 330 420Q330 398 317 385H210L174 240Q135 80 135 68Q135 26 162 26Q197 26 230 60T283 144Q285 150 288 151T303 153H307Q322 153 322 145Q322 142 319 133Q314 117 301 95T267 48T216 6T155 -11Q125 -11 98 4T59 56Q57 64 57 83V101L92 241Q127 382 128 383Q128 385 77 385H26Z\"><\/path><path stroke-width=\"0\" id=\"E838-MJMAIN-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path stroke-width=\"0\" id=\"E838-MJMATHI-6E\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path stroke-width=\"0\" id=\"E838-MJMAIN-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E838-MJMATHI-54\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E838-MJMAIN-223C\" x=\"981\" y=\"0\"><\/use><use xlink:href=\"#E838-MJMATHI-74\" x=\"2037\" y=\"0\"><\/use><use xlink:href=\"#E838-MJMAIN-28\" x=\"2398\" y=\"0\"><\/use><use xlink:href=\"#E838-MJMATHI-6E\" x=\"2787\" y=\"0\"><\/use><use xlink:href=\"#E838-MJMAIN-29\" x=\"3387\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">T \\sim t(n)<\/script>.<\/p>\n<p>\u968f\u673a\u53d8\u91cf<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"8.771ex\" height=\"2.577ex\" viewBox=\"0 -806.1 3776.6 1109.7\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E838-MJMATHI-54\" d=\"M40 437Q21 437 21 445Q21 450 37 501T71 602L88 651Q93 669 101 677H569H659Q691 677 697 676T704 667Q704 661 687 553T668 444Q668 437 649 437Q640 437 637 437T631 442L629 445Q629 451 635 490T641 551Q641 586 628 604T573 629Q568 630 515 631Q469 631 457 630T439 622Q438 621 368 343T298 60Q298 48 386 46Q418 46 427 45T436 36Q436 31 433 22Q429 4 424 1L422 0Q419 0 415 0Q410 0 363 1T228 2Q99 2 64 0H49Q43 6 43 9T45 27Q49 40 55 46H83H94Q174 46 189 55Q190 56 191 56Q196 59 201 76T241 233Q258 301 269 344Q339 619 339 625Q339 630 310 630H279Q212 630 191 624Q146 614 121 583T67 467Q60 445 57 441T43 437H40Z\"><\/path><path stroke-width=\"0\" id=\"E838-MJMAIN-223C\" d=\"M55 166Q55 241 101 304T222 367Q260 367 296 349T362 304T421 252T484 208T554 189Q616 189 655 236T694 338Q694 350 698 358T708 367Q722 367 722 334Q722 260 677 197T562 134H554Q517 134 481 152T414 196T355 248T292 293T223 311Q179 311 145 286Q109 257 96 218T80 156T69 133Q55 133 55 166Z\"><\/path><path stroke-width=\"0\" id=\"E838-MJMATHI-74\" d=\"M26 385Q19 392 19 395Q19 399 22 411T27 425Q29 430 36 430T87 431H140L159 511Q162 522 166 540T173 566T179 586T187 603T197 615T211 624T229 626Q247 625 254 615T261 596Q261 589 252 549T232 470L222 433Q222 431 272 431H323Q330 424 330 420Q330 398 317 385H210L174 240Q135 80 135 68Q135 26 162 26Q197 26 230 60T283 144Q285 150 288 151T303 153H307Q322 153 322 145Q322 142 319 133Q314 117 301 95T267 48T216 6T155 -11Q125 -11 98 4T59 56Q57 64 57 83V101L92 241Q127 382 128 383Q128 385 77 385H26Z\"><\/path><path stroke-width=\"0\" id=\"E838-MJMAIN-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path stroke-width=\"0\" id=\"E838-MJMATHI-6E\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path stroke-width=\"0\" id=\"E838-MJMAIN-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E838-MJMATHI-54\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E838-MJMAIN-223C\" x=\"981\" y=\"0\"><\/use><use xlink:href=\"#E838-MJMATHI-74\" x=\"2037\" y=\"0\"><\/use><use xlink:href=\"#E838-MJMAIN-28\" x=\"2398\" y=\"0\"><\/use><use xlink:href=\"#E838-MJMATHI-6E\" x=\"2787\" y=\"0\"><\/use><use xlink:href=\"#E838-MJMAIN-29\" x=\"3387\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">T \\sim t(n)<\/script>\u7684\u6982\u7387\u5bc6\u5ea6\u4e3a \uff08\u5177\u6709\u5bf9\u79f0\u6027\uff09<\/p>\n<div contenteditable=\"true\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n141\" cid=\"n141\" mdtype=\"math_block\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><div class=\"MathJax_SVG_Display\"><span class=\"MathJax_SVG\" id=\"MathJax-Element-563-Frame\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"78.56ex\" height=\"7.48ex\" viewBox=\"0 -1861.6 33824.5 3220.6\" role=\"img\" focusable=\"false\" style=\"vertical-align: -3.156ex; 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transform=\"translate(2236,0)\"><g transform=\"translate(342,0)\"><rect stroke=\"none\" width=\"1145\" height=\"60\" x=\"0\" y=\"220\"><\/rect><g transform=\"translate(60,676)\"><use xlink:href=\"#E714-MJMATHI-78\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E714-MJMAIN-32\" x=\"808\" y=\"513\"><\/use><\/g><use xlink:href=\"#E714-MJMATHI-6E\" x=\"272\" y=\"-686\"><\/use><\/g><\/g><use xlink:href=\"#E714-MJSZ3-29\" x=\"3843\" y=\"-1\"><\/use><g transform=\"translate(4579,1237)\"><use transform=\"scale(0.707)\" xlink:href=\"#E714-MJMAIN-2212\" x=\"0\" y=\"0\"><\/use><g transform=\"translate(550,0)\"><g transform=\"translate(120,0)\"><rect stroke=\"none\" width=\"1059\" height=\"60\" x=\"0\" y=\"146\"><\/rect><g transform=\"translate(60,372)\"><use transform=\"scale(0.5)\" xlink:href=\"#E714-MJMATHI-6E\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.5)\" xlink:href=\"#E714-MJMAIN-2B\" x=\"600\" y=\"0\"><\/use><use transform=\"scale(0.5)\" xlink:href=\"#E714-MJMAIN-31\" x=\"1378\" y=\"0\"><\/use><\/g><use transform=\"scale(0.5)\" xlink:href=\"#E714-MJMAIN-32\" x=\"809\" y=\"-621\"><\/use><\/g><\/g><\/g><\/g><use xlink:href=\"#E714-MJMAIN-2C\" x=\"14315\" y=\"0\"><\/use><use xlink:href=\"#E714-MJMATHI-78\" x=\"15760\" y=\"0\"><\/use><use xlink:href=\"#E714-MJMAIN-2208\" x=\"16610\" y=\"0\"><\/use><use xlink:href=\"#E714-MJMAIN-28\" x=\"17555\" y=\"0\"><\/use><use xlink:href=\"#E714-MJMAIN-2212\" x=\"17944\" y=\"0\"><\/use><use xlink:href=\"#E714-MJMAIN-221E\" x=\"18722\" y=\"0\"><\/use><use xlink:href=\"#E714-MJMAIN-2C\" x=\"19722\" y=\"0\"><\/use><use xlink:href=\"#E714-MJMAIN-2B\" x=\"20166\" y=\"0\"><\/use><use xlink:href=\"#E714-MJMAIN-221E\" x=\"20944\" y=\"0\"><\/use><use xlink:href=\"#E714-MJMAIN-29\" x=\"21944\" y=\"0\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/span><\/div><script type=\"math\/tex; mode=display\" id=\"MathJax-Element-563\">f(x) = \\frac{\\Gamma(\\frac{n+1}{2})}{\\Gamma(\\frac{n}{2})\\sqrt{n\\pi}} \\left(1+\\frac{x^2}{n}\\right)^{-\\frac{n+1}{2}}, \\quad x \\in (-\\infty, +\\infty)<\/script><\/div><\/div>\n<p>\u5f53<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"7.329ex\" height=\"1.644ex\" viewBox=\"0 -605.1 3155.6 707.6\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.238ex;\"><defs><path stroke-width=\"0\" id=\"E837-MJMATHI-6E\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 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style=\"vertical-align: -0.238ex;\"><defs><path stroke-width=\"0\" id=\"E842-MJMATHI-6E\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path stroke-width=\"0\" id=\"E842-MJMAIN-3E\" d=\"M84 520Q84 528 88 533T96 539L99 540Q106 540 253 471T544 334L687 265Q694 260 694 250T687 235Q685 233 395 96L107 -40H101Q83 -38 83 -20Q83 -19 83 -17Q82 -10 98 -1Q117 9 248 71Q326 108 378 132L626 250L378 368Q90 504 86 509Q84 513 84 520Z\"><\/path><path stroke-width=\"0\" id=\"E842-MJMAIN-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E842-MJMATHI-6E\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E842-MJMAIN-3E\" x=\"877\" y=\"0\"><\/use><use xlink:href=\"#E842-MJMAIN-31\" x=\"1933\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">n>1<\/script> \u65f6\uff0c <span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"7.185ex\" height=\"2.577ex\" viewBox=\"0 -806.1 3093.6 1109.7\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E843-MJMAIN-5B\" d=\"M118 -250V750H255V710H158V-210H255V-250H118Z\"><\/path><path stroke-width=\"0\" id=\"E843-MJMATHI-54\" d=\"M40 437Q21 437 21 445Q21 450 37 501T71 602L88 651Q93 669 101 677H569H659Q691 677 697 676T704 667Q704 661 687 553T668 444Q668 437 649 437Q640 437 637 437T631 442L629 445Q629 451 635 490T641 551Q641 586 628 604T573 629Q568 630 515 631Q469 631 457 630T439 622Q438 621 368 343T298 60Q298 48 386 46Q418 46 427 45T436 36Q436 31 433 22Q429 4 424 1L422 0Q419 0 415 0Q410 0 363 1T228 2Q99 2 64 0H49Q43 6 43 9T45 27Q49 40 55 46H83H94Q174 46 189 55Q190 56 191 56Q196 59 201 76T241 233Q258 301 269 344Q339 619 339 625Q339 630 310 630H279Q212 630 191 624Q146 614 121 583T67 467Q60 445 57 441T43 437H40Z\"><\/path><path stroke-width=\"0\" id=\"E843-MJMAIN-5D\" d=\"M22 710V750H159V-250H22V-210H119V710H22Z\"><\/path><path stroke-width=\"0\" id=\"E843-MJMAIN-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path stroke-width=\"0\" id=\"E843-MJMAIN-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E843-MJMAIN-5B\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E843-MJMATHI-54\" x=\"278\" y=\"0\"><\/use><use xlink:href=\"#E843-MJMAIN-5D\" x=\"982\" y=\"0\"><\/use><use xlink:href=\"#E843-MJMAIN-3D\" x=\"1537\" y=\"0\"><\/use><use xlink:href=\"#E843-MJMAIN-30\" x=\"2593\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">\\mathbb{}[T] = 0<\/script>\uff1b<\/li>\n<li>\u5f53<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"5.652ex\" height=\"1.994ex\" viewBox=\"0 -755.9 2433.6 858.4\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.238ex;\"><defs><path stroke-width=\"0\" id=\"E844-MJMATHI-6E\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path stroke-width=\"0\" id=\"E844-MJMAIN-3E\" d=\"M84 520Q84 528 88 533T96 539L99 540Q106 540 253 471T544 334L687 265Q694 260 694 250T687 235Q685 233 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type=\"math\/tex\">n>2<\/script> \u65f6\uff0c <span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"15.491ex\" height=\"3.044ex\" viewBox=\"0 -806.1 6669.5 1310.7\" role=\"img\" focusable=\"false\" style=\"vertical-align: -1.172ex;\"><defs><path stroke-width=\"0\" id=\"E845-MJAMS-56\" d=\"M316 683Q327 676 327 666Q327 648 302 648Q272 642 258 628Q249 621 249 608Q252 589 263 556T289 485T322 406T357 325T388 256T411 205L420 185Q423 185 473 317Q547 497 547 590Q547 621 541 632T516 648Q501 648 498 654Q488 664 498 679L504 683H607H660Q695 683 707 680T719 667Q719 660 714 654T700 648Q678 648 658 628L642 614L513 301Q484 231 449 148T397 25T380 -15Q373 -20 368 -20Q361 -20 358 -15Q354 -13 287 135T149 438T67 610Q45 648 18 648Q11 648 6 653T0 666Q0 677 9 680T59 683H164H316ZM216 614Q216 620 216 622T216 628T216 633T217 635T218 638T219 640T221 644T224 648H84L96 632Q118 592 236 330L367 43L387 88L404 132L380 185Q250 468 222 568Q216 590 216 614ZM576 645Q584 628 584 597L587 568L598 597Q609 624 618 637L624 648H600Q576 648 576 645Z\"><\/path><path stroke-width=\"0\" id=\"E845-MJAMS-41\" d=\"M130 -1H63Q34 -1 26 2T17 17Q17 24 22 29T35 35Q49 35 64 44T88 66Q101 93 210 383Q331 693 335 697T346 701T357 697Q358 696 493 399Q621 104 633 83Q656 35 686 35Q693 35 698 30T703 17Q703 5 693 2T643 -1H541Q388 -1 386 1Q378 6 378 16Q378 24 383 29T397 35Q412 35 434 45T456 65Q456 93 428 170L419 197H197L195 179Q184 134 184 97Q184 82 186 71T190 55T198 45T205 39T214 36L219 35Q241 31 241 17Q241 5 233 2T196 -1H130ZM493 68Q493 51 481 35H619Q604 56 515 256Q486 321 468 361L348 637Q347 637 330 592T313 543Q313 538 358 436T448 219T493 68ZM404 235Q404 239 355 355T295 488L275 430Q241 348 208 232H306Q404 232 404 235ZM155 48Q151 55 148 88V117L135 86Q118 47 117 46L110 37L135 35H159Q157 41 155 48Z\"><\/path><path stroke-width=\"0\" id=\"E845-MJAMS-52\" d=\"M17 665Q17 672 28 683H221Q415 681 439 677Q461 673 481 667T516 654T544 639T566 623T584 607T597 592T607 578T614 565T618 554L621 548Q626 530 626 497Q626 447 613 419Q578 348 473 326L455 321Q462 310 473 292T517 226T578 141T637 72T686 35Q705 30 705 16Q705 7 693 -1H510Q503 6 404 159L306 310H268V183Q270 67 271 59Q274 42 291 38Q295 37 319 35Q344 35 353 28Q362 17 353 3L346 -1H28Q16 5 16 16Q16 35 55 35Q96 38 101 52Q106 60 106 341T101 632Q95 645 55 648Q17 648 17 665ZM241 35Q238 42 237 45T235 78T233 163T233 337V621L237 635L244 648H133Q136 641 137 638T139 603T141 517T141 341Q141 131 140 89T134 37Q133 36 133 35H241ZM457 496Q457 540 449 570T425 615T400 634T377 643Q374 643 339 648Q300 648 281 635Q271 628 270 610T268 481V346H284Q327 346 375 352Q421 364 439 392T457 496ZM492 537T492 496T488 427T478 389T469 371T464 361Q464 360 465 360Q469 360 497 370Q593 400 593 495Q593 592 477 630L457 637L461 626Q474 611 488 561Q492 537 492 496ZM464 243Q411 317 410 317Q404 317 401 315Q384 315 370 312H346L526 35H619L606 50Q553 109 464 243Z\"><\/path><path stroke-width=\"0\" id=\"E845-MJMAIN-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path stroke-width=\"0\" id=\"E845-MJMATHI-54\" d=\"M40 437Q21 437 21 445Q21 450 37 501T71 602L88 651Q93 669 101 677H569H659Q691 677 697 676T704 667Q704 661 687 553T668 444Q668 437 649 437Q640 437 637 437T631 442L629 445Q629 451 635 490T641 551Q641 586 628 604T573 629Q568 630 515 631Q469 631 457 630T439 622Q438 621 368 343T298 60Q298 48 386 46Q418 46 427 45T436 36Q436 31 433 22Q429 4 424 1L422 0Q419 0 415 0Q410 0 363 1T228 2Q99 2 64 0H49Q43 6 43 9T45 27Q49 40 55 46H83H94Q174 46 189 55Q190 56 191 56Q196 59 201 76T241 233Q258 301 269 344Q339 619 339 625Q339 630 310 630H279Q212 630 191 624Q146 614 121 583T67 467Q60 445 57 441T43 437H40Z\"><\/path><path stroke-width=\"0\" id=\"E845-MJMAIN-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 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y=\"0\"><\/use><use xlink:href=\"#E845-MJMAIN-28\" x=\"2166\" y=\"0\"><\/use><use xlink:href=\"#E845-MJMATHI-54\" x=\"2555\" y=\"0\"><\/use><use xlink:href=\"#E845-MJMAIN-29\" x=\"3259\" y=\"0\"><\/use><use xlink:href=\"#E845-MJMAIN-3D\" x=\"3925\" y=\"0\"><\/use><g transform=\"translate(4703,0)\"><g transform=\"translate(397,0)\"><rect stroke=\"none\" width=\"1447\" height=\"60\" x=\"0\" y=\"220\"><\/rect><use transform=\"scale(0.707)\" xlink:href=\"#E845-MJMATHI-6E\" x=\"723\" y=\"582\"><\/use><g transform=\"translate(60,-376)\"><use transform=\"scale(0.707)\" xlink:href=\"#E845-MJMATHI-6E\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E845-MJMAIN-2212\" x=\"600\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E845-MJMAIN-32\" x=\"1378\" y=\"0\"><\/use><\/g><\/g><\/g><\/g><\/svg><\/span><script type=\"math\/tex\">\\mathbb{VAR}(T) = \\frac{n}{n-2}<\/script>.<\/li>\n\n<\/ul>\n<h4>\uff083\uff09F \u5206\u5e03<\/h4>\n<p><strong>\u5b9a\u4e49 0.14<\/strong> \u968f\u673a\u53d8\u91cf<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"11.43ex\" height=\"2.811ex\" viewBox=\"0 -906.7 4921.1 1210.2\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E846-MJMATHI-58\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path stroke-width=\"0\" id=\"E846-MJMAIN-223C\" d=\"M55 166Q55 241 101 304T222 367Q260 367 296 349T362 304T421 252T484 208T554 189Q616 189 655 236T694 338Q694 350 698 358T708 367Q722 367 722 334Q722 260 677 197T562 134H554Q517 134 481 152T414 196T355 248T292 293T223 311Q179 311 145 286Q109 257 96 218T80 156T69 133Q55 133 55 166Z\"><\/path><path stroke-width=\"0\" id=\"E846-MJMATHI-3C7\" d=\"M576 -125Q576 -147 547 -175T487 -204H476Q394 -204 363 -157Q334 -114 293 26L284 59Q283 58 248 19T170 -66T92 -151T53 -191Q49 -194 43 -194Q36 -194 31 -189T25 -177T38 -154T151 -30L272 102L265 131Q189 405 135 405Q104 405 87 358Q86 351 68 351Q48 351 48 361Q48 369 56 386T89 423T148 442Q224 442 258 400Q276 375 297 320T330 222L341 180Q344 180 455 303T573 429Q579 431 582 431Q600 431 600 414Q600 407 587 392T477 270Q356 138 353 134L362 102Q392 -10 428 -89T490 -168Q504 -168 517 -156T536 -126Q539 -116 543 -115T557 -114T571 -115Q576 -118 576 -125Z\"><\/path><path stroke-width=\"0\" id=\"E846-MJMAIN-32\" d=\"M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z\"><\/path><path stroke-width=\"0\" id=\"E846-MJMAIN-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path stroke-width=\"0\" id=\"E846-MJMATHI-6D\" d=\"M21 287Q22 293 24 303T36 341T56 388T88 425T132 442T175 435T205 417T221 395T229 376L231 369Q231 367 232 367L243 378Q303 442 384 442Q401 442 415 440T441 433T460 423T475 411T485 398T493 385T497 373T500 364T502 357L510 367Q573 442 659 442Q713 442 746 415T780 336Q780 285 742 178T704 50Q705 36 709 31T724 26Q752 26 776 56T815 138Q818 149 821 151T837 153Q857 153 857 145Q857 144 853 130Q845 101 831 73T785 17T716 -10Q669 -10 648 17T627 73Q627 92 663 193T700 345Q700 404 656 404H651Q565 404 506 303L499 291L466 157Q433 26 428 16Q415 -11 385 -11Q372 -11 364 -4T353 8T350 18Q350 29 384 161L420 307Q423 322 423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 181Q151 335 151 342Q154 357 154 369Q154 405 129 405Q107 405 92 377T69 316T57 280Q55 278 41 278H27Q21 284 21 287Z\"><\/path><path stroke-width=\"0\" id=\"E846-MJMAIN-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E846-MJMATHI-58\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E846-MJMAIN-223C\" x=\"1129\" y=\"0\"><\/use><g transform=\"translate(2185,0)\"><use xlink:href=\"#E846-MJMATHI-3C7\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E846-MJMAIN-32\" x=\"885\" y=\"513\"><\/use><\/g><use xlink:href=\"#E846-MJMAIN-28\" x=\"3265\" y=\"0\"><\/use><use xlink:href=\"#E846-MJMATHI-6D\" x=\"3654\" y=\"0\"><\/use><use xlink:href=\"#E846-MJMAIN-29\" x=\"4532\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">X \\sim \\chi^2(m)<\/script>\u548c<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"10.577ex\" height=\"2.811ex\" viewBox=\"0 -906.7 4554.1 1210.2\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E847-MJMATHI-59\" d=\"M66 637Q54 637 49 637T39 638T32 641T30 647T33 664T42 682Q44 683 56 683Q104 680 165 680Q288 680 306 683H316Q322 677 322 674T320 656Q316 643 310 637H298Q242 637 242 624Q242 619 292 477T343 333L346 336Q350 340 358 349T379 373T411 410T454 461Q546 568 561 587T577 618Q577 634 545 637Q528 637 528 647Q528 649 530 661Q533 676 535 679T549 683Q551 683 578 682T657 680Q684 680 713 681T746 682Q763 682 763 673Q763 669 760 657T755 643Q753 637 734 637Q662 632 617 587Q608 578 477 424L348 273L322 169Q295 62 295 57Q295 46 363 46Q379 46 384 45T390 35Q390 33 388 23Q384 6 382 4T366 1Q361 1 324 1T232 2Q170 2 138 2T102 1Q84 1 84 9Q84 14 87 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0 -1 0 0)\"><use xlink:href=\"#E847-MJMATHI-59\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E847-MJMAIN-223C\" x=\"1040\" y=\"0\"><\/use><g transform=\"translate(2096,0)\"><use xlink:href=\"#E847-MJMATHI-3C7\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E847-MJMAIN-32\" x=\"885\" y=\"513\"><\/use><\/g><use xlink:href=\"#E847-MJMAIN-28\" x=\"3176\" y=\"0\"><\/use><use xlink:href=\"#E847-MJMATHI-6E\" x=\"3565\" y=\"0\"><\/use><use xlink:href=\"#E847-MJMAIN-29\" x=\"4165\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">Y \\sim \\chi^2(n)<\/script>\u76f8\u4e92\u72ec\u7acb\uff0c\u5219\u968f\u673a\u53d8\u91cf<\/p>\n<div contenteditable=\"true\" spellcheck=\"false\" class=\"mathjax-block md-end-block md-math-block md-rawblock\" id=\"mathjax-n153\" cid=\"n153\" mdtype=\"math_block\"><div class=\"md-rawblock-container md-math-container\" tabindex=\"-1\"><div class=\"MathJax_SVG_Display\"><span class=\"MathJax_SVG\" id=\"MathJax-Element-565-Frame\" 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343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><g transform=\"translate(32046,0)\"><g id=\"mjx-eqn-21\"><use xlink:href=\"#E716-MJMAIN-28\"><\/use><use xlink:href=\"#E716-MJMAIN-32\" x=\"389\" y=\"0\"><\/use><use xlink:href=\"#E716-MJMAIN-31\" x=\"889\" y=\"0\"><\/use><use xlink:href=\"#E716-MJMAIN-29\" x=\"1389\" y=\"0\"><\/use><\/g><\/g><g transform=\"translate(14763,0)\"><g transform=\"translate(-15,0)\"><use xlink:href=\"#E716-MJMATHI-5A\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E716-MJMAIN-3D\" x=\"1000\" y=\"0\"><\/use><g transform=\"translate(1778,0)\"><g transform=\"translate(397,0)\"><rect stroke=\"none\" width=\"2350\" height=\"60\" x=\"0\" y=\"220\"><\/rect><g transform=\"translate(60,715)\"><use xlink:href=\"#E716-MJMATHI-58\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E716-MJMAIN-2F\" x=\"852\" y=\"0\"><\/use><use xlink:href=\"#E716-MJMATHI-6D\" x=\"1352\" y=\"0\"><\/use><\/g><g transform=\"translate(243,-716)\"><use xlink:href=\"#E716-MJMATHI-59\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E716-MJMAIN-2F\" x=\"763\" y=\"0\"><\/use><use xlink:href=\"#E716-MJMATHI-6E\" x=\"1263\" y=\"0\"><\/use><\/g><\/g><\/g><\/g><\/g><\/g><\/svg><\/span><\/div><script type=\"math\/tex; mode=display\" id=\"MathJax-Element-565\">Z = \\frac{X\/m}{Y\/n}<\/script><\/div><\/div>\n<p>\u670d\u4ece\u81ea\u7531\u5ea6\u4e3a<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"6.273ex\" height=\"2.577ex\" viewBox=\"0 -806.1 2700.7 1109.7\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E848-MJMAIN-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 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287Z\"><\/path><path stroke-width=\"0\" id=\"E848-MJMAIN-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path stroke-width=\"0\" id=\"E848-MJMATHI-6E\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path stroke-width=\"0\" id=\"E848-MJMAIN-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 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-0.121ex;\"><defs><path stroke-width=\"0\" id=\"E849-MJMATHI-46\" d=\"M48 1Q31 1 31 11Q31 13 34 25Q38 41 42 43T65 46Q92 46 125 49Q139 52 144 61Q146 66 215 342T285 622Q285 629 281 629Q273 632 228 634H197Q191 640 191 642T193 659Q197 676 203 680H742Q749 676 749 669Q749 664 736 557T722 447Q720 440 702 440H690Q683 445 683 453Q683 454 686 477T689 530Q689 560 682 579T663 610T626 626T575 633T503 634H480Q398 633 393 631Q388 629 386 623Q385 622 352 492L320 363H375Q378 363 398 363T426 364T448 367T472 374T489 386Q502 398 511 419T524 457T529 475Q532 480 548 480H560Q567 475 567 470Q567 467 536 339T502 207Q500 200 482 200H470Q463 206 463 212Q463 215 468 234T473 274Q473 303 453 310T364 317H309L277 190Q245 66 245 60Q245 46 334 46H359Q365 40 365 39T363 19Q359 6 353 0H336Q295 2 185 2Q120 2 86 2T48 1Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E849-MJMATHI-46\" x=\"0\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">F<\/script>\u5206\u5e03\uff0c\u8bb0<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"12.789ex\" height=\"2.577ex\" viewBox=\"0 -806.1 5506.2 1109.7\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E852-MJMATHI-5A\" d=\"M58 8Q58 23 64 35Q64 36 329 334T596 635L586 637Q575 637 512 637H500H476Q442 637 420 635T365 624T311 598T266 548T228 469Q227 466 226 463T224 458T223 453T222 450L221 448Q218 443 202 443Q185 443 182 453L214 561Q228 606 241 651Q249 679 253 681Q256 683 487 683H718Q723 678 723 675Q723 673 717 649Q189 54 188 52L185 49H274Q369 50 377 51Q452 60 500 100T579 247Q587 272 590 277T603 282H607Q628 282 628 271Q547 5 541 2Q538 0 300 0H124Q58 0 58 8Z\"><\/path><path stroke-width=\"0\" id=\"E852-MJMAIN-223C\" d=\"M55 166Q55 241 101 304T222 367Q260 367 296 349T362 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xlink:href=\"#E852-MJMAIN-29\" x=\"5117\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">Z \\sim F(m, n)<\/script>.<\/p>\n<p>\u968f\u673a\u53d8\u91cf<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"12.789ex\" height=\"2.577ex\" viewBox=\"0 -806.1 5506.2 1109.7\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E852-MJMATHI-5A\" d=\"M58 8Q58 23 64 35Q64 36 329 334T596 635L586 637Q575 637 512 637H500H476Q442 637 420 635T365 624T311 598T266 548T228 469Q227 466 226 463T224 458T223 453T222 450L221 448Q218 443 202 443Q185 443 182 453L214 561Q228 606 241 651Q249 679 253 681Q256 683 487 683H718Q723 678 723 675Q723 673 717 649Q189 54 188 52L185 49H274Q369 50 377 51Q452 60 500 100T579 247Q587 272 590 277T603 282H607Q628 282 628 271Q547 5 541 2Q538 0 300 0H124Q58 0 58 8Z\"><\/path><path stroke-width=\"0\" 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mode=display\" id=\"MathJax-Element-566\">f(z) = \\begin{cases} \\frac{\\Gamma(\\frac{m+n}{2})(\\frac{m}{n})^{\\frac{m}{2}} z^{\\frac{m}{2}-1}}{\\Gamma(\\frac{m}{2})\\Gamma(\\frac{n}{2})(1+\\frac{mz}{n})^{\\frac{m+n}{2}}}, & z>0 \\\\ 0, & z \\leq 0 \\end{cases}<\/script><\/div><\/div>\n<p>\u82e5\u968f\u673a\u53d8\u91cf<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"12.789ex\" height=\"2.577ex\" viewBox=\"0 -806.1 5506.2 1109.7\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E852-MJMATHI-5A\" d=\"M58 8Q58 23 64 35Q64 36 329 334T596 635L586 637Q575 637 512 637H500H476Q442 637 420 635T365 624T311 598T266 548T228 469Q227 466 226 463T224 458T223 453T222 450L221 448Q218 443 202 443Q185 443 182 453L214 561Q228 606 241 651Q249 679 253 681Q256 683 487 683H718Q723 678 723 675Q723 673 717 649Q189 54 188 52L185 49H274Q369 50 377 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831 73T785 17T716 -10Q669 -10 648 17T627 73Q627 92 663 193T700 345Q700 404 656 404H651Q565 404 506 303L499 291L466 157Q433 26 428 16Q415 -11 385 -11Q372 -11 364 -4T353 8T350 18Q350 29 384 161L420 307Q423 322 423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 181Q151 335 151 342Q154 357 154 369Q154 405 129 405Q107 405 92 377T69 316T57 280Q55 278 41 278H27Q21 284 21 287Z\"><\/path><path stroke-width=\"0\" id=\"E852-MJMAIN-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path stroke-width=\"0\" id=\"E852-MJMATHI-6E\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 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x=\"2805\" y=\"0\"><\/use><use xlink:href=\"#E852-MJMATHI-6D\" x=\"3194\" y=\"0\"><\/use><use xlink:href=\"#E852-MJMAIN-2C\" x=\"4072\" y=\"0\"><\/use><use xlink:href=\"#E852-MJMATHI-6E\" x=\"4517\" y=\"0\"><\/use><use xlink:href=\"#E852-MJMAIN-29\" x=\"5117\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">Z \\sim F(m, n)<\/script>\uff0c\u5219<span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"13.133ex\" height=\"3.278ex\" viewBox=\"0 -956.9 5654.5 1411.3\" role=\"img\" focusable=\"false\" style=\"vertical-align: -1.055ex;\"><defs><path stroke-width=\"0\" id=\"E853-MJMAIN-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path stroke-width=\"0\" 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442 415 440T441 433T460 423T475 411T485 398T493 385T497 373T500 364T502 357L510 367Q573 442 659 442Q713 442 746 415T780 336Q780 285 742 178T704 50Q705 36 709 31T724 26Q752 26 776 56T815 138Q818 149 821 151T837 153Q857 153 857 145Q857 144 853 130Q845 101 831 73T785 17T716 -10Q669 -10 648 17T627 73Q627 92 663 193T700 345Q700 404 656 404H651Q565 404 506 303L499 291L466 157Q433 26 428 16Q415 -11 385 -11Q372 -11 364 -4T353 8T350 18Q350 29 384 161L420 307Q423 322 423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 181Q151 335 151 342Q154 357 154 369Q154 405 129 405Q107 405 92 377T69 316T57 280Q55 278 41 278H27Q21 284 21 287Z\"><\/path><path stroke-width=\"0\" id=\"E853-MJMAIN-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><g transform=\"translate(120,0)\"><rect stroke=\"none\" width=\"631\" height=\"60\" x=\"0\" y=\"220\"><\/rect><use transform=\"scale(0.707)\" xlink:href=\"#E853-MJMAIN-31\" x=\"196\" y=\"571\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E853-MJMATHI-5A\" x=\"84\" y=\"-548\"><\/use><\/g><use xlink:href=\"#E853-MJMAIN-223C\" x=\"1149\" y=\"0\"><\/use><use xlink:href=\"#E853-MJMATHI-46\" x=\"2204\" y=\"0\"><\/use><use xlink:href=\"#E853-MJMAIN-28\" x=\"2953\" y=\"0\"><\/use><use xlink:href=\"#E853-MJMATHI-6E\" x=\"3342\" y=\"0\"><\/use><use xlink:href=\"#E853-MJMAIN-2C\" x=\"3942\" y=\"0\"><\/use><use xlink:href=\"#E853-MJMATHI-6D\" x=\"4387\" y=\"0\"><\/use><use xlink:href=\"#E853-MJMAIN-29\" x=\"5265\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">\\frac{1}{Z} \\sim F(n, m)<\/script>.<\/p>\n<h2>\u56db\u3001\u5173\u952e\u5b9a\u7406\u4e0e\u6027\u8d28<\/h2>\n<h3>1. \u65e0\u504f\u65b9\u5dee\u4fee\u6b63\u539f\u7406<\/h3>\n<ul>\n<li>\u6837\u672c\u65b9\u5dee <span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"2.641ex\" height=\"2.694ex\" viewBox=\"0 -906.7 1137.3 1160\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.588ex;\"><defs><path stroke-width=\"0\" id=\"E854-MJMATHI-53\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path stroke-width=\"0\" id=\"E854-MJMAIN-32\" d=\"M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z\"><\/path><path stroke-width=\"0\" id=\"E854-MJMATHI-6E\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E854-MJMATHI-53\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E854-MJMAIN-32\" x=\"925\" y=\"487\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E854-MJMATHI-6E\" x=\"866\" y=\"-211\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">S_n^2<\/script> \u7684\u671f\u671b <span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"15.108ex\" height=\"3.395ex\" viewBox=\"0 -1007.2 6504.7 1461.5\" role=\"img\" focusable=\"false\" style=\"vertical-align: -1.055ex;\"><defs><path stroke-width=\"0\" id=\"E855-MJMATHI-45\" d=\"M492 213Q472 213 472 226Q472 230 477 250T482 285Q482 316 461 323T364 330H312Q311 328 277 192T243 52Q243 48 254 48T334 46Q428 46 458 48T518 61Q567 77 599 117T670 248Q680 270 683 272Q690 274 698 274Q718 274 718 261Q613 7 608 2Q605 0 322 0H133Q31 0 31 11Q31 13 34 25Q38 41 42 43T65 46Q92 46 125 49Q139 52 144 61Q146 66 215 342T285 622Q285 629 281 629Q273 632 228 634H197Q191 640 191 642T193 659Q197 676 203 680H757Q764 676 764 669Q764 664 751 557T737 447Q735 440 717 440H705Q698 445 698 453L701 476Q704 500 704 528Q704 558 697 578T678 609T643 625T596 632T532 634H485Q397 633 392 631Q388 629 386 622Q385 619 355 499T324 377Q347 376 372 376H398Q464 376 489 391T534 472Q538 488 540 490T557 493Q562 493 565 493T570 492T572 491T574 487T577 483L544 351Q511 218 508 216Q505 213 492 213Z\"><\/path><path stroke-width=\"0\" id=\"E855-MJMAIN-5B\" d=\"M118 -250V750H255V710H158V-210H255V-250H118Z\"><\/path><path stroke-width=\"0\" id=\"E855-MJMATHI-53\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path stroke-width=\"0\" id=\"E855-MJMAIN-32\" d=\"M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z\"><\/path><path stroke-width=\"0\" id=\"E855-MJMATHI-6E\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path stroke-width=\"0\" id=\"E855-MJMAIN-5D\" d=\"M22 710V750H159V-250H22V-210H119V710H22Z\"><\/path><path stroke-width=\"0\" id=\"E855-MJMAIN-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path stroke-width=\"0\" id=\"E855-MJMAIN-2212\" d=\"M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z\"><\/path><path stroke-width=\"0\" id=\"E855-MJMAIN-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path stroke-width=\"0\" id=\"E855-MJMATHI-3C3\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E855-MJMATHI-45\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E855-MJMAIN-5B\" x=\"764\" y=\"0\"><\/use><g transform=\"translate(1042,0)\"><use xlink:href=\"#E855-MJMATHI-53\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E855-MJMAIN-32\" x=\"925\" y=\"487\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E855-MJMATHI-6E\" x=\"866\" y=\"-211\"><\/use><\/g><use xlink:href=\"#E855-MJMAIN-5D\" x=\"2179\" y=\"0\"><\/use><use xlink:href=\"#E855-MJMAIN-3D\" x=\"2735\" y=\"0\"><\/use><g transform=\"translate(3513,0)\"><g transform=\"translate(397,0)\"><rect stroke=\"none\" width=\"1447\" height=\"60\" x=\"0\" y=\"220\"><\/rect><g transform=\"translate(60,462)\"><use transform=\"scale(0.707)\" xlink:href=\"#E855-MJMATHI-6E\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E855-MJMAIN-2212\" x=\"600\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E855-MJMAIN-31\" x=\"1378\" y=\"0\"><\/use><\/g><use transform=\"scale(0.707)\" xlink:href=\"#E855-MJMATHI-6E\" x=\"723\" y=\"-488\"><\/use><\/g><\/g><g transform=\"translate(5478,0)\"><use xlink:href=\"#E855-MJMATHI-3C3\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E855-MJMAIN-32\" x=\"809\" y=\"513\"><\/use><\/g><\/g><\/svg><\/span><script type=\"math\/tex\">E[S_n^2] = \\frac{n-1}{n}\\sigma^2<\/script>\uff0c\u5b58\u5728\u7cfb\u7edf\u6027\u4f4e\u4f30\u3002<\/li>\n<li>\u4fee\u6b63\u903b\u8f91\uff1a\u504f\u5dee\u6ee1\u8db3 <span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"19.107ex\" height=\"3.395ex\" viewBox=\"0 -1107.7 8226.7 1461.5\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.822ex;\"><defs><path stroke-width=\"0\" id=\"E856-MJSZ1-2211\" d=\"M61 748Q64 750 489 750H913L954 640Q965 609 976 579T993 533T999 516H979L959 517Q936 579 886 621T777 682Q724 700 655 705T436 710H319Q183 710 183 709Q186 706 348 484T511 259Q517 250 513 244L490 216Q466 188 420 134T330 27L149 -187Q149 -188 362 -188Q388 -188 436 -188T506 -189Q679 -189 778 -162T936 -43Q946 -27 959 6H999L913 -249L489 -250Q65 -250 62 -248Q56 -246 56 -239Q56 -234 118 -161Q186 -81 245 -11L428 206Q428 207 242 462L57 717L56 728Q56 744 61 748Z\"><\/path><path stroke-width=\"0\" id=\"E856-MJMATHI-6E\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path stroke-width=\"0\" id=\"E856-MJMATHI-69\" d=\"M184 600Q184 624 203 642T247 661Q265 661 277 649T290 619Q290 596 270 577T226 557Q211 557 198 567T184 600ZM21 287Q21 295 30 318T54 369T98 420T158 442Q197 442 223 419T250 357Q250 340 236 301T196 196T154 83Q149 61 149 51Q149 26 166 26Q175 26 185 29T208 43T235 78T260 137Q263 149 265 151T282 153Q302 153 302 143Q302 135 293 112T268 61T223 11T161 -11Q129 -11 102 10T74 74Q74 91 79 106T122 220Q160 321 166 341T173 380Q173 404 156 404H154Q124 404 99 371T61 287Q60 286 59 284T58 281T56 279T53 278T49 278T41 278H27Q21 284 21 287Z\"><\/path><path stroke-width=\"0\" id=\"E856-MJMAIN-3D\" d=\"M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z\"><\/path><path stroke-width=\"0\" id=\"E856-MJMAIN-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path stroke-width=\"0\" id=\"E856-MJMAIN-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path stroke-width=\"0\" id=\"E856-MJMATHI-58\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 23Q728 7 725 4T711 1Q708 1 678 1T589 2Q528 2 496 2T461 1Q444 1 444 10Q444 11 446 25Q448 35 450 39T455 44T464 46T480 47T506 54Q523 62 523 64Q522 64 476 181L429 299Q241 95 236 84Q232 76 232 72Q232 53 261 47Q262 47 267 47T273 46Q276 46 277 46T280 45T283 42T284 35Q284 26 282 19Q279 6 276 4T261 1Q258 1 243 1T201 2T142 2Q64 2 42 0Z\"><\/path><path stroke-width=\"0\" id=\"E856-MJMAIN-2212\" d=\"M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z\"><\/path><path stroke-width=\"0\" id=\"E856-MJMAIN-AF\" d=\"M69 544V590H430V544H69Z\"><\/path><path stroke-width=\"0\" id=\"E856-MJMAIN-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><path stroke-width=\"0\" id=\"E856-MJMAIN-30\" d=\"M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E856-MJSZ1-2211\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E856-MJMATHI-6E\" x=\"1493\" y=\"674\"><\/use><g transform=\"translate(1056,-286)\"><use transform=\"scale(0.707)\" xlink:href=\"#E856-MJMATHI-69\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E856-MJMAIN-3D\" x=\"345\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E856-MJMAIN-31\" x=\"1123\" y=\"0\"><\/use><\/g><use xlink:href=\"#E856-MJMAIN-28\" x=\"2303\" y=\"0\"><\/use><g transform=\"translate(2692,0)\"><use xlink:href=\"#E856-MJMATHI-58\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E856-MJMATHI-69\" x=\"1170\" y=\"-213\"><\/use><\/g><use xlink:href=\"#E856-MJMAIN-2212\" x=\"4086\" y=\"0\"><\/use><g transform=\"translate(5087,0)\"><use xlink:href=\"#E856-MJMATHI-58\" x=\"24\" y=\"0\"><\/use><g transform=\"translate(15,498)\"><use transform=\"scale(0.707)\" xlink:href=\"#E856-MJMAIN-AF\" x=\"-69\" y=\"0\"><\/use><g transform=\"translate(189.99863838272435,0) scale(1.337700706764202,1)\"><use transform=\"scale(0.707)\" xlink:href=\"#E856-MJMAIN-AF\"><\/use><\/g><use transform=\"scale(0.707)\" xlink:href=\"#E856-MJMAIN-AF\" x=\"774\" y=\"0\"><\/use><\/g><\/g><use xlink:href=\"#E856-MJMAIN-29\" x=\"6004\" y=\"0\"><\/use><use xlink:href=\"#E856-MJMAIN-3D\" x=\"6670\" y=\"0\"><\/use><use xlink:href=\"#E856-MJMAIN-30\" x=\"7726\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">\\sum_{i=1}^n (X_i - \\overline{X}) = 0<\/script>\uff0c\u6709\u6548\u81ea\u7531\u5ea6\u4e3a <span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"5.394ex\" height=\"2.11ex\" viewBox=\"0 -755.9 2322.4 908.7\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.355ex;\"><defs><path stroke-width=\"0\" id=\"E858-MJMATHI-6E\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path stroke-width=\"0\" id=\"E858-MJMAIN-2212\" d=\"M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z\"><\/path><path stroke-width=\"0\" id=\"E858-MJMAIN-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E858-MJMATHI-6E\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E858-MJMAIN-2212\" x=\"822\" y=\"0\"><\/use><use xlink:href=\"#E858-MJMAIN-31\" x=\"1822\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">n-1<\/script>\uff0c\u6545\u9664\u4ee5 <span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"5.394ex\" height=\"2.11ex\" viewBox=\"0 -755.9 2322.4 908.7\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.355ex;\"><defs><path stroke-width=\"0\" id=\"E858-MJMATHI-6E\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z\"><\/path><path stroke-width=\"0\" id=\"E858-MJMAIN-2212\" d=\"M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z\"><\/path><path stroke-width=\"0\" id=\"E858-MJMAIN-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E858-MJMATHI-6E\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E858-MJMAIN-2212\" x=\"822\" y=\"0\"><\/use><use xlink:href=\"#E858-MJMAIN-31\" x=\"1822\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">n-1<\/script> \u5f97\u5230\u65e0\u504f\u65b9\u5dee <span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"2.574ex\" height=\"2.344ex\" viewBox=\"0 -906.7 1108.2 1009.2\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.238ex;\"><defs><path stroke-width=\"0\" id=\"E859-MJMATHI-53\" d=\"M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z\"><\/path><path stroke-width=\"0\" id=\"E859-MJMAIN-32\" d=\"M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E859-MJMATHI-53\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E859-MJMAIN-32\" x=\"925\" y=\"513\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">S^2<\/script>\u3002<\/li>\n\n<\/ul>\n<h3>2. \u5206\u5e03\u53ef\u52a0\u6027\u6c47\u603b<\/h3>\n<ul>\n<li>\u6b63\u6001\u5206\u5e03\uff1a\u72ec\u7acb\u7684 <span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"9.739ex\" height=\"3.044ex\" viewBox=\"0 -906.7 4193.1 1310.7\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.938ex;\"><defs><path stroke-width=\"0\" id=\"E860-MJMATHI-4E\" d=\"M234 637Q231 637 226 637Q201 637 196 638T191 649Q191 676 202 682Q204 683 299 683Q376 683 387 683T401 677Q612 181 616 168L670 381Q723 592 723 606Q723 633 659 637Q635 637 635 648Q635 650 637 660Q641 676 643 679T653 683Q656 683 684 682T767 680Q817 680 843 681T873 682Q888 682 888 672Q888 650 880 642Q878 637 858 637Q787 633 769 597L620 7Q618 0 599 0Q585 0 582 2Q579 5 453 305L326 604L261 344Q196 88 196 79Q201 46 268 46H278Q284 41 284 38T282 19Q278 6 272 0H259Q228 2 151 2Q123 2 100 2T63 2T46 1Q31 1 31 10Q31 14 34 26T39 40Q41 46 62 46Q130 49 150 85Q154 91 221 362L289 634Q287 635 234 637Z\"><\/path><path stroke-width=\"0\" id=\"E860-MJMAIN-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 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666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path stroke-width=\"0\" id=\"E860-MJMAIN-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path stroke-width=\"0\" id=\"E860-MJMATHI-3C3\" d=\"M184 -11Q116 -11 74 34T31 147Q31 247 104 333T274 430Q275 431 414 431H552Q553 430 555 429T559 427T562 425T565 422T567 420T569 416T570 412T571 407T572 401Q572 357 507 357Q500 357 490 357T476 358H416L421 348Q439 310 439 263Q439 153 359 71T184 -11ZM361 278Q361 358 276 358Q152 358 115 184Q114 180 114 178Q106 141 106 117Q106 67 131 47T188 26Q242 26 287 73Q316 103 334 153T356 233T361 278Z\"><\/path><path stroke-width=\"0\" id=\"E860-MJMAIN-32\" d=\"M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z\"><\/path><path stroke-width=\"0\" id=\"E860-MJMAIN-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E860-MJMATHI-4E\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E860-MJMAIN-28\" x=\"888\" y=\"0\"><\/use><g transform=\"translate(1277,0)\"><use xlink:href=\"#E860-MJMATHI-3BC\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E860-MJMAIN-31\" x=\"852\" y=\"-213\"><\/use><\/g><use xlink:href=\"#E860-MJMAIN-2C\" x=\"2333\" y=\"0\"><\/use><g transform=\"translate(2778,0)\"><use xlink:href=\"#E860-MJMATHI-3C3\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E860-MJMAIN-32\" x=\"809\" y=\"487\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E860-MJMAIN-31\" x=\"807\" y=\"-434\"><\/use><\/g><use xlink:href=\"#E860-MJMAIN-29\" x=\"3804\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">N(\\mu_1,\\sigma_1^2)<\/script> \u4e0e <span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"9.739ex\" height=\"3.044ex\" viewBox=\"0 -906.7 4193.1 1310.7\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.938ex;\"><defs><path stroke-width=\"0\" id=\"E861-MJMATHI-4E\" d=\"M234 637Q231 637 226 637Q201 637 196 638T191 649Q191 676 202 682Q204 683 299 683Q376 683 387 683T401 677Q612 181 616 168L670 381Q723 592 723 606Q723 633 659 637Q635 637 635 648Q635 650 637 660Q641 676 643 679T653 683Q656 683 684 682T767 680Q817 680 843 681T873 682Q888 682 888 672Q888 650 880 642Q878 637 858 637Q787 633 769 597L620 7Q618 0 599 0Q585 0 582 2Q579 5 453 305L326 604L261 344Q196 88 196 79Q201 46 268 46H278Q284 41 284 38T282 19Q278 6 272 0H259Q228 2 151 2Q123 2 100 2T63 2T46 1Q31 1 31 10Q31 14 34 26T39 40Q41 46 62 46Q130 49 150 85Q154 91 221 362L289 634Q287 635 234 637Z\"><\/path><path stroke-width=\"0\" id=\"E861-MJMAIN-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path stroke-width=\"0\" id=\"E861-MJMATHI-3BC\" d=\"M58 -216Q44 -216 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xlink:href=\"#E861-MJMAIN-29\" x=\"3804\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">N(\\mu_2,\\sigma_2^2)<\/script> \u4e4b\u548c \/ \u5dee\u670d\u4ece <span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"20.254ex\" height=\"3.044ex\" viewBox=\"0 -906.7 8720.5 1310.7\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.938ex;\"><defs><path stroke-width=\"0\" id=\"E862-MJMATHI-4E\" d=\"M234 637Q231 637 226 637Q201 637 196 638T191 649Q191 676 202 682Q204 683 299 683Q376 683 387 683T401 677Q612 181 616 168L670 381Q723 592 723 606Q723 633 659 637Q635 637 635 648Q635 650 637 660Q641 676 643 679T653 683Q656 683 684 682T767 680Q817 680 843 681T873 682Q888 682 888 672Q888 650 880 642Q878 637 858 637Q787 633 769 597L620 7Q618 0 599 0Q585 0 582 2Q579 5 453 305L326 604L261 344Q196 88 196 79Q201 46 268 46H278Q284 41 284 38T282 19Q278 6 272 0H259Q228 2 151 2Q123 2 100 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y=\"0\"><\/use><g transform=\"translate(3555,0)\"><use xlink:href=\"#E862-MJMATHI-3BC\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E862-MJMAIN-32\" x=\"852\" y=\"-213\"><\/use><\/g><use xlink:href=\"#E862-MJMAIN-2C\" x=\"4612\" y=\"0\"><\/use><g transform=\"translate(5057,0)\"><use xlink:href=\"#E862-MJMATHI-3C3\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E862-MJMAIN-32\" x=\"809\" y=\"487\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E862-MJMAIN-31\" x=\"807\" y=\"-434\"><\/use><\/g><use xlink:href=\"#E862-MJMAIN-2B\" x=\"6305\" y=\"0\"><\/use><g transform=\"translate(7305,0)\"><use xlink:href=\"#E862-MJMATHI-3C3\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E862-MJMAIN-32\" x=\"809\" y=\"487\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E862-MJMAIN-32\" x=\"807\" y=\"-434\"><\/use><\/g><use xlink:href=\"#E862-MJMAIN-29\" x=\"8331\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">N(\\mu_1\\pm\\mu_2, \\sigma_1^2+\\sigma_2^2)<\/script>\u3002<\/li>\n<li>\u4e8c\u9879\u5206\u5e03\uff1a\u72ec\u7acb\u7684 <span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"8.218ex\" height=\"2.577ex\" viewBox=\"0 -806.1 3538.2 1109.7\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E863-MJMATHI-42\" d=\"M231 637Q204 637 199 638T194 649Q194 676 205 682Q206 683 335 683Q594 683 608 681Q671 671 713 636T756 544Q756 480 698 429T565 360L555 357Q619 348 660 311T702 219Q702 146 630 78T453 1Q446 0 242 0Q42 0 39 2Q35 5 35 10Q35 17 37 24Q42 43 47 45Q51 46 62 46H68Q95 46 128 49Q142 52 147 61Q150 65 219 339T288 628Q288 635 231 637ZM649 544Q649 574 634 600T585 634Q578 636 493 637Q473 637 451 637T416 636H403Q388 635 384 626Q382 622 352 506Q352 503 351 500L320 374H401Q482 374 494 376Q554 386 601 434T649 544ZM595 229Q595 273 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-187 185 -190T172 -194Q170 -194 161 -194T127 -193T65 -192Q-5 -192 -24 -194H-32Q-39 -187 -39 -183Q-37 -156 -26 -148H-6Q28 -147 33 -136Q36 -130 94 103T155 350Q156 355 156 364Q156 405 131 405Q109 405 94 377T71 316T59 280Q57 278 43 278H29Q23 284 23 287ZM178 102Q200 26 252 26Q282 26 310 49T356 107Q374 141 392 215T411 325V331Q411 405 350 405Q339 405 328 402T306 393T286 380T269 365T254 350T243 336T235 326L232 322Q232 321 229 308T218 264T204 212Q178 106 178 102Z\"><\/path><path stroke-width=\"0\" id=\"E863-MJMAIN-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E863-MJMATHI-42\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E863-MJMAIN-28\" x=\"759\" y=\"0\"><\/use><g transform=\"translate(1148,0)\"><use xlink:href=\"#E863-MJMATHI-6E\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E863-MJMAIN-31\" x=\"848\" y=\"-213\"><\/use><\/g><use xlink:href=\"#E863-MJMAIN-2C\" x=\"2201\" y=\"0\"><\/use><use xlink:href=\"#E863-MJMATHI-70\" x=\"2646\" y=\"0\"><\/use><use xlink:href=\"#E863-MJMAIN-29\" x=\"3149\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">B(n_1,p)<\/script> \u4e0e <span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"8.218ex\" height=\"2.577ex\" viewBox=\"0 -806.1 3538.2 1109.7\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E864-MJMATHI-42\" d=\"M231 637Q204 637 199 638T194 649Q194 676 205 682Q206 683 335 683Q594 683 608 681Q671 671 713 636T756 544Q756 480 698 429T565 360L555 357Q619 348 660 311T702 219Q702 146 630 78T453 1Q446 0 242 0Q42 0 39 2Q35 5 35 10Q35 17 37 24Q42 43 47 45Q51 46 62 46H68Q95 46 128 49Q142 52 147 61Q150 65 219 339T288 628Q288 635 231 637ZM649 544Q649 574 634 600T585 634Q578 636 493 637Q473 637 451 637T416 636H403Q388 635 384 626Q382 622 352 506Q352 503 351 500L320 374H401Q482 374 494 376Q554 386 601 434T649 544ZM595 229Q595 273 572 302T512 336Q506 337 429 337Q311 337 310 336Q310 334 293 263T258 122L240 52Q240 48 252 48T333 46Q422 46 429 47Q491 54 543 105T595 229Z\"><\/path><path stroke-width=\"0\" id=\"E864-MJMAIN-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path stroke-width=\"0\" id=\"E864-MJMATHI-6E\" d=\"M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 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stroke-width=\"0\" id=\"E864-MJMAIN-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E864-MJMATHI-42\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E864-MJMAIN-28\" x=\"759\" y=\"0\"><\/use><g transform=\"translate(1148,0)\"><use xlink:href=\"#E864-MJMATHI-6E\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E864-MJMAIN-32\" x=\"848\" y=\"-213\"><\/use><\/g><use xlink:href=\"#E864-MJMAIN-2C\" x=\"2201\" y=\"0\"><\/use><use xlink:href=\"#E864-MJMATHI-70\" x=\"2646\" y=\"0\"><\/use><use xlink:href=\"#E864-MJMAIN-29\" x=\"3149\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">B(n_2,p)<\/script> \u4e4b\u548c\u670d\u4ece <span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"13.504ex\" height=\"2.577ex\" viewBox=\"0 -806.1 5814.2 1109.7\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E865-MJMATHI-42\" d=\"M231 637Q204 637 199 638T194 649Q194 676 205 682Q206 683 335 683Q594 683 608 681Q671 671 713 636T756 544Q756 480 698 429T565 360L555 357Q619 348 660 311T702 219Q702 146 630 78T453 1Q446 0 242 0Q42 0 39 2Q35 5 35 10Q35 17 37 24Q42 43 47 45Q51 46 62 46H68Q95 46 128 49Q142 52 147 61Q150 65 219 339T288 628Q288 635 231 637ZM649 544Q649 574 634 600T585 634Q578 636 493 637Q473 637 451 637T416 636H403Q388 635 384 626Q382 622 352 506Q352 503 351 500L320 374H401Q482 374 494 376Q554 386 601 434T649 544ZM595 229Q595 273 572 302T512 336Q506 337 429 337Q311 337 310 336Q310 334 293 263T258 122L240 52Q240 48 252 48T333 46Q422 46 429 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id=\"E865-MJMAIN-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path stroke-width=\"0\" id=\"E865-MJMAIN-2B\" d=\"M56 237T56 250T70 270H369V420L370 570Q380 583 389 583Q402 583 409 568V270H707Q722 262 722 250T707 230H409V-68Q401 -82 391 -82H389H387Q375 -82 369 -68V230H70Q56 237 56 250Z\"><\/path><path stroke-width=\"0\" id=\"E865-MJMAIN-32\" d=\"M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 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y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E865-MJMAIN-32\" x=\"848\" y=\"-213\"><\/use><\/g><use xlink:href=\"#E865-MJMAIN-2C\" x=\"4477\" y=\"0\"><\/use><use xlink:href=\"#E865-MJMATHI-70\" x=\"4922\" y=\"0\"><\/use><use xlink:href=\"#E865-MJMAIN-29\" x=\"5425\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">B(n_1+n_2,p)<\/script>\u3002<\/li>\n<li>\u6cca\u677e\u5206\u5e03\uff1a\u72ec\u7acb\u7684 <span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"5.959ex\" height=\"2.577ex\" viewBox=\"0 -806.1 2565.6 1109.7\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E866-MJMATHI-50\" d=\"M287 628Q287 635 230 637Q206 637 199 638T192 648Q192 649 194 659Q200 679 203 681T397 683Q587 682 600 680Q664 669 707 631T751 530Q751 453 685 389Q616 321 507 303Q500 302 402 301H307L277 182Q247 66 247 59Q247 55 248 54T255 50T272 48T305 46H336Q342 37 342 35Q342 19 335 5Q330 0 319 0Q316 0 282 1T182 2Q120 2 87 2T51 1Q33 1 33 11Q33 13 36 25Q40 41 44 43T67 46Q94 46 127 49Q141 52 146 61Q149 65 218 339T287 628ZM645 554Q645 567 643 575T634 597T609 619T560 635Q553 636 480 637Q463 637 445 637T416 636T404 636Q391 635 386 627Q384 621 367 550T332 412T314 344Q314 342 395 342H407H430Q542 342 590 392Q617 419 631 471T645 554Z\"><\/path><path stroke-width=\"0\" id=\"E866-MJMAIN-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path stroke-width=\"0\" id=\"E866-MJMATHI-3BB\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 673Z\"><\/path><path stroke-width=\"0\" id=\"E866-MJMAIN-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path stroke-width=\"0\" id=\"E866-MJMAIN-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E866-MJMATHI-50\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E866-MJMAIN-28\" x=\"751\" y=\"0\"><\/use><g transform=\"translate(1140,0)\"><use xlink:href=\"#E866-MJMATHI-3BB\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E866-MJMAIN-31\" x=\"824\" y=\"-213\"><\/use><\/g><use xlink:href=\"#E866-MJMAIN-29\" x=\"2176\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">P(\\lambda_1)<\/script> \u4e0e <span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"5.959ex\" height=\"2.577ex\" viewBox=\"0 -806.1 2565.6 1109.7\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E867-MJMATHI-50\" d=\"M287 628Q287 635 230 637Q206 637 199 638T192 648Q192 649 194 659Q200 679 203 681T397 683Q587 682 600 680Q664 669 707 631T751 530Q751 453 685 389Q616 321 507 303Q500 302 402 301H307L277 182Q247 66 247 59Q247 55 248 54T255 50T272 48T305 46H336Q342 37 342 35Q342 19 335 5Q330 0 319 0Q316 0 282 1T182 2Q120 2 87 2T51 1Q33 1 33 11Q33 13 36 25Q40 41 44 43T67 46Q94 46 127 49Q141 52 146 61Q149 65 218 339T287 628ZM645 554Q645 567 643 575T634 597T609 619T560 635Q553 636 480 637Q463 637 445 637T416 636T404 636Q391 635 386 627Q384 621 367 550T332 412T314 344Q314 342 395 342H407H430Q542 342 590 392Q617 419 631 471T645 554Z\"><\/path><path stroke-width=\"0\" id=\"E867-MJMAIN-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path stroke-width=\"0\" id=\"E867-MJMATHI-3BB\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 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y=\"0\"><\/use><use xlink:href=\"#E867-MJMAIN-28\" x=\"751\" y=\"0\"><\/use><g transform=\"translate(1140,0)\"><use xlink:href=\"#E867-MJMATHI-3BB\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E867-MJMAIN-32\" x=\"824\" y=\"-213\"><\/use><\/g><use xlink:href=\"#E867-MJMAIN-29\" x=\"2176\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">P(\\lambda_2)<\/script> \u4e4b\u548c\u670d\u4ece <span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"11.205ex\" height=\"2.577ex\" viewBox=\"0 -806.1 4824.6 1109.7\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E868-MJMATHI-50\" d=\"M287 628Q287 635 230 637Q206 637 199 638T192 648Q192 649 194 659Q200 679 203 681T397 683Q587 682 600 680Q664 669 707 631T751 530Q751 453 685 389Q616 321 507 303Q500 302 402 301H307L277 182Q247 66 247 59Q247 55 248 54T255 50T272 48T305 46H336Q342 37 342 35Q342 19 335 5Q330 0 319 0Q316 0 282 1T182 2Q120 2 87 2T51 1Q33 1 33 11Q33 13 36 25Q40 41 44 43T67 46Q94 46 127 49Q141 52 146 61Q149 65 218 339T287 628ZM645 554Q645 567 643 575T634 597T609 619T560 635Q553 636 480 637Q463 637 445 637T416 636T404 636Q391 635 386 627Q384 621 367 550T332 412T314 344Q314 342 395 342H407H430Q542 342 590 392Q617 419 631 471T645 554Z\"><\/path><path stroke-width=\"0\" id=\"E868-MJMAIN-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path stroke-width=\"0\" id=\"E868-MJMATHI-3BB\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 673Z\"><\/path><path stroke-width=\"0\" id=\"E868-MJMAIN-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path stroke-width=\"0\" id=\"E868-MJMAIN-2B\" d=\"M56 237T56 250T70 270H369V420L370 570Q380 583 389 583Q402 583 409 568V270H707Q722 262 722 250T707 230H409V-68Q401 -82 391 -82H389H387Q375 -82 369 -68V230H70Q56 237 56 250Z\"><\/path><path stroke-width=\"0\" id=\"E868-MJMAIN-32\" d=\"M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z\"><\/path><path stroke-width=\"0\" id=\"E868-MJMAIN-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E868-MJMATHI-50\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E868-MJMAIN-28\" x=\"751\" y=\"0\"><\/use><g transform=\"translate(1140,0)\"><use xlink:href=\"#E868-MJMATHI-3BB\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E868-MJMAIN-31\" x=\"824\" y=\"-213\"><\/use><\/g><use xlink:href=\"#E868-MJMAIN-2B\" x=\"2398\" y=\"0\"><\/use><g transform=\"translate(3398,0)\"><use xlink:href=\"#E868-MJMATHI-3BB\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E868-MJMAIN-32\" x=\"824\" y=\"-213\"><\/use><\/g><use xlink:href=\"#E868-MJMAIN-29\" x=\"4435\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">P(\\lambda_1+\\lambda_2)<\/script>\u3002<\/li>\n<li>Gamma \u5206\u5e03\uff1a\u72ec\u7acb\u4e14\u540c\u5c3a\u5ea6\u53c2\u6570\u7684 <span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"8.185ex\" height=\"2.577ex\" viewBox=\"0 -806.1 3524.2 1109.7\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E869-MJMAIN-393\" d=\"M128 619Q121 626 117 628T101 631T58 634H25V680H554V676Q556 670 568 560T582 444V440H542V444Q542 445 538 478T523 545T492 598Q454 634 349 634H334Q264 634 249 633T233 621Q232 618 232 339L233 61Q240 54 245 52T270 48T333 46H360V0H348Q324 3 182 3Q51 3 36 0H25V46H58Q100 47 109 49T128 61V619Z\"><\/path><path stroke-width=\"0\" id=\"E869-MJMAIN-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path stroke-width=\"0\" id=\"E869-MJMATHI-3B1\" d=\"M34 156Q34 270 120 356T309 442Q379 442 421 402T478 304Q484 275 485 237V208Q534 282 560 374Q564 388 566 390T582 393Q603 393 603 385Q603 376 594 346T558 261T497 161L486 147L487 123Q489 67 495 47T514 26Q528 28 540 37T557 60Q559 67 562 68T577 70Q597 70 597 62Q597 56 591 43Q579 19 556 5T512 -10H505Q438 -10 414 62L411 69L400 61Q390 53 370 41T325 18T267 -2T203 -11Q124 -11 79 39T34 156ZM208 26Q257 26 306 47T379 90L403 112Q401 255 396 290Q382 405 304 405Q235 405 183 332Q156 292 139 224T121 120Q121 71 146 49T208 26Z\"><\/path><path stroke-width=\"0\" id=\"E869-MJMAIN-31\" d=\"M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z\"><\/path><path stroke-width=\"0\" id=\"E869-MJMAIN-2C\" d=\"M78 35T78 60T94 103T137 121Q165 121 187 96T210 8Q210 -27 201 -60T180 -117T154 -158T130 -185T117 -194Q113 -194 104 -185T95 -172Q95 -168 106 -156T131 -126T157 -76T173 -3V9L172 8Q170 7 167 6T161 3T152 1T140 0Q113 0 96 17Z\"><\/path><path stroke-width=\"0\" id=\"E869-MJMATHI-3BB\" d=\"M166 673Q166 685 183 694H202Q292 691 316 644Q322 629 373 486T474 207T524 67Q531 47 537 34T546 15T551 6T555 2T556 -2T550 -11H482Q457 3 450 18T399 152L354 277L340 262Q327 246 293 207T236 141Q211 112 174 69Q123 9 111 -1T83 -12Q47 -12 47 20Q47 37 61 52T199 187Q229 216 266 252T321 306L338 322Q338 323 288 462T234 612Q214 657 183 657Q166 657 166 673Z\"><\/path><path stroke-width=\"0\" id=\"E869-MJMAIN-29\" d=\"M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E869-MJMAIN-393\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E869-MJMAIN-28\" x=\"625\" y=\"0\"><\/use><g transform=\"translate(1014,0)\"><use xlink:href=\"#E869-MJMATHI-3B1\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E869-MJMAIN-31\" x=\"905\" y=\"-213\"><\/use><\/g><use xlink:href=\"#E869-MJMAIN-2C\" x=\"2107\" y=\"0\"><\/use><use xlink:href=\"#E869-MJMATHI-3BB\" x=\"2552\" y=\"0\"><\/use><use xlink:href=\"#E869-MJMAIN-29\" x=\"3135\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">\\Gamma(\\alpha_1,\\lambda)<\/script> \u4e0e <span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"8.185ex\" height=\"2.577ex\" viewBox=\"0 -806.1 3524.2 1109.7\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E870-MJMAIN-393\" d=\"M128 619Q121 626 117 628T101 631T58 634H25V680H554V676Q556 670 568 560T582 444V440H542V444Q542 445 538 478T523 545T492 598Q454 634 349 634H334Q264 634 249 633T233 621Q232 618 232 339L233 61Q240 54 245 52T270 48T333 46H360V0H348Q324 3 182 3Q51 3 36 0H25V46H58Q100 47 109 49T128 61V619Z\"><\/path><path stroke-width=\"0\" id=\"E870-MJMAIN-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path stroke-width=\"0\" id=\"E870-MJMATHI-3B1\" d=\"M34 156Q34 270 120 356T309 442Q379 442 421 402T478 304Q484 275 485 237V208Q534 282 560 374Q564 388 566 390T582 393Q603 393 603 385Q603 376 594 346T558 261T497 161L486 147L487 123Q489 67 495 47T514 26Q528 28 540 37T557 60Q559 67 562 68T577 70Q597 70 597 62Q597 56 591 43Q579 19 556 5T512 -10H505Q438 -10 414 62L411 69L400 61Q390 53 370 41T325 18T267 -2T203 -11Q124 -11 79 39T34 156ZM208 26Q257 26 306 47T379 90L403 112Q401 255 396 290Q382 405 304 405Q235 405 183 332Q156 292 139 224T121 120Q121 71 146 49T208 26Z\"><\/path><path stroke-width=\"0\" id=\"E870-MJMAIN-32\" d=\"M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 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-225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z\"><\/path><\/defs><g stroke=\"currentColor\" fill=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><use xlink:href=\"#E870-MJMAIN-393\" x=\"0\" y=\"0\"><\/use><use xlink:href=\"#E870-MJMAIN-28\" x=\"625\" y=\"0\"><\/use><g transform=\"translate(1014,0)\"><use xlink:href=\"#E870-MJMATHI-3B1\" x=\"0\" y=\"0\"><\/use><use transform=\"scale(0.707)\" xlink:href=\"#E870-MJMAIN-32\" x=\"905\" y=\"-213\"><\/use><\/g><use xlink:href=\"#E870-MJMAIN-2C\" x=\"2107\" y=\"0\"><\/use><use xlink:href=\"#E870-MJMATHI-3BB\" x=\"2552\" y=\"0\"><\/use><use xlink:href=\"#E870-MJMAIN-29\" x=\"3135\" y=\"0\"><\/use><\/g><\/svg><\/span><script type=\"math\/tex\">\\Gamma(\\alpha_2,\\lambda)<\/script> \u4e4b\u548c\u670d\u4ece <span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"13.564ex\" height=\"2.577ex\" viewBox=\"0 -806.1 5840.2 1109.7\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E871-MJMAIN-393\" d=\"M128 619Q121 626 117 628T101 631T58 634H25V680H554V676Q556 670 568 560T582 444V440H542V444Q542 445 538 478T523 545T492 598Q454 634 349 634H334Q264 634 249 633T233 621Q232 618 232 339L233 61Q240 54 245 52T270 48T333 46H360V0H348Q324 3 182 3Q51 3 36 0H25V46H58Q100 47 109 49T128 61V619Z\"><\/path><path stroke-width=\"0\" id=\"E871-MJMAIN-28\" d=\"M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z\"><\/path><path stroke-width=\"0\" id=\"E871-MJMATHI-3B1\" d=\"M34 156Q34 270 120 356T309 442Q379 442 421 402T478 304Q484 275 485 237V208Q534 282 560 374Q564 388 566 390T582 393Q603 393 603 385Q603 376 594 346T558 261T497 161L486 147L487 123Q489 67 495 47T514 26Q528 28 540 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N(0,1)<\/script>\uff0c\u5219 <span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"17.406ex\" height=\"2.811ex\" viewBox=\"0 -906.7 7494 1210.2\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E877-MJMATHI-58\" d=\"M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 408 681T453 682T473 682Q490 682 490 671Q490 670 488 658Q484 643 481 640T465 637Q434 634 411 620L488 426L541 485Q646 598 646 610Q646 628 622 635Q617 635 609 637Q594 637 594 648Q594 650 596 664Q600 677 606 683H618Q619 683 643 683T697 681T738 680Q828 680 837 683H845Q852 676 852 672Q850 647 840 637H824Q790 636 763 628T722 611T698 593L687 584Q687 585 592 480L505 384Q505 383 536 304T601 142T638 56Q648 47 699 46Q734 46 734 37Q734 35 732 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1\/2)<\/script>\uff08\u5373 <span class=\"MathJax_SVG\" tabindex=\"-1\" style=\"font-size: 100%; display: inline-block;\"><svg xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"5.476ex\" height=\"2.811ex\" viewBox=\"0 -906.7 2357.6 1210.2\" role=\"img\" focusable=\"false\" style=\"vertical-align: -0.705ex;\"><defs><path stroke-width=\"0\" id=\"E878-MJMATHI-3C7\" d=\"M576 -125Q576 -147 547 -175T487 -204H476Q394 -204 363 -157Q334 -114 293 26L284 59Q283 58 248 19T170 -66T92 -151T53 -191Q49 -194 43 -194Q36 -194 31 -189T25 -177T38 -154T151 -30L272 102L265 131Q189 405 135 405Q104 405 87 358Q86 351 68 351Q48 351 48 361Q48 369 56 386T89 423T148 442Q224 442 258 400Q276 375 297 320T330 222L341 180Q344 180 455 303T573 429Q579 431 582 431Q600 431 600 414Q600 407 587 392T477 270Q356 138 353 134L362 102Q392 -10 428 -89T490 -168Q504 -168 517 -156T536 -126Q539 -116 543 -115T557 -114T571 -115Q576 -118 576 -125Z\"><\/path><path stroke-width=\"0\" id=\"E878-MJMAIN-32\" d=\"M109 429Q82 429 66 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