早教吧作业答案频道 -->其他-->
求概率论题解答题目如下,求大神LetX1andX2betwoindependentstandardnormaldistributedrandomvariables.LetUbeindependentofX1andX2andisuniformlydistributedon(0,1).DefineZ=UX1+(1−U)X2.Findthemeanandv
题目详情
求概率论题解答
题目如下,求大神 Let X1 and X2 be two independent standard normal distributed random variables.
Let U be independent of X1 and X2 and is uniformly distributed on (0, 1). Define
Z = UX1 + (1 − U)X2. Find the mean and variance of Z.
题目如下,求大神 Let X1 and X2 be two independent standard normal distributed random variables.
Let U be independent of X1 and X2 and is uniformly distributed on (0, 1). Define
Z = UX1 + (1 − U)X2. Find the mean and variance of Z.
▼优质解答
答案和解析
E(Z)=E( UX1 + (1 − U)X2)=E( U)E(X1) + E((1 − U))E(X2) = 0V(Z)=E(Z^2)-(E(Z)^2)=E(Z^2)=E(U^2 X1^2 + (1-U)^2(X2)^2 + 2U(1-U)X1X2)=E(U^2)*1+E((1-U)^2)*1+0=2E(U^2) =2 积分(0 到 1) x^2 dx = 2/3...
看了求概率论题解答题目如下,求大神...的网友还看了以下:
请求翻译乱码请高手翻译下什么意思啊?亅酰谎u知欋5??k(so?笿?(n?豃]?n#?k(so? 2020-04-06 …
已知函数f(x)=e^x-ln(x+1)(1)求函数f(x)的单调区间(2)证明e+e^1/2+e 2020-06-06 …
lim(x趋于0时)[(e^x+e^2x+e^3x+……e^nx)/n]^(1/x)的极限;我自己 2020-06-12 …
请问下面的经纬度数分别是哪些城市?107°E,6°S.96°E,17°N.90°E,23.5°N. 2020-07-03 …
求冥函数的半径E[(-1)^(n-1)*x^(2n)/2n](开头的符号不会打..反正就是那个,用 2020-07-14 …
求冥函数的收敛半径E[(-1)^(n-1)*x^(2n)/2n](开头的符号不会打..反正就是那个 2020-07-14 …
1.已知集合M={x|x=3n+1,n∈Z}.集合N={x|x=4n+3,n∈Z}.求M∩N2.设 2020-07-30 …
求助:X~N(0,1),如何求E(X^2),E(X^4),E(X^n)X~N(0,1),如何求E( 2020-08-02 …
已知(1+1/x)^x=e,e^x-1=x,limx→1(x+x^2+...+x^n-n)/(x-1 2020-10-31 …
LTI系统中,已知Y[n]=x[n]+2x[n-1]+x[n-2]求1)h[n](x[n]=δ[n] 2020-11-01 …