概率論與數(shù)理統(tǒng)計--第三章多維隨機(jī)變量及其分布習(xí)題課-資料下載頁
2024-10-16 12:15本頁面
【正文】 0yyxxy y?????????.0,0,0,e21 2yyy y,)()(),(,0 yfxfyxfyx YX ??????? 上由于在.不獨立與故 YX)(),()()3(yfyxfyxfYYX ?????? ??????.,0,0,22其他yxyx)(),()(xfyxfxyfXXY ???? ?????? ?.,0,0,e其他yxyx}21{)4( ?? YXP }2{ }2,1{ ? ??? YP YXP?? ????? ???21 2d)(dd),(yyfyxyxfY?? ????202102de21dedyyyxxyxy.e51e21e21221???????又由條件密度的性質(zhì)知,d)2(}21{ 1 xxfYXP YX? ?????????? ???.,0,20,2)2(其他而xxxf YX從而有 xxYXP d2}21{ 10???? .41?? ???? ?? ,d),()()5( xxzxfzf Z根據(jù),20,0,),(時即只有當(dāng)非零由于要被積函數(shù)zxxzxxzxf??????。0)(,0 ?? zfz Z時當(dāng),0 時當(dāng) ?z ? ??? 20 )( de)(zxzZ xxzf??? 20 deezxz xx。e)12(e 2zz z ?? ??? 因此 ????????????? ?????.0,0,0e12e)(2zzzzfzzZ? ????? 1 d)(}1{)6( zzfYXP Zzzzz d]e)12(e[102? ?? ??? .ee1 121 ?? ???
教學(xué)課件相關(guān)推薦
鄂ICP備17016276號-1