41.设二维随机变量(X,Y)的联合概率密度为-|||-, lt xlt 2 lt ylt 2 ,-|||-f(x,y)= ) (x+y)/8 0, .-|||-其他,-|||-求E(X),E(Y ),cov(X,Y),ρxy·

8.设二维随机变量(X,Y)的概率密度为-|||-f(x,y)= ) (e)^-y,0lt xlt y 0 .-|||-求边缘概率密度.

8.设二维随机变量(X,Y)的概率密度为-|||-f(x,y)= ) (e)^-y,0lt xlt y 0, .-|||-求边缘概率密度.

设二维随机变量(X,Y)的概率密度为-|||-f(x,y)= { ,0lt ylt 2 0, .

[例1]设二维随机变量(X,Y)具有概率密度-|||-f(x,y)=-|||-^-2(x+y) lt xlt +infty lt ylt +infty -||

4.3 设二维随机变量(X,Y)的概率密度为-|||-f(x,y)= ) k,0lt (x)^2lt ylt xlt 1 0, ,

8.设二维随机变量(X,Y)的联合概率密度为-|||-f(x,y)= ) 6(1-y),0lt xlt ylt 1 0

求指导本题解题过程，谢谢您！三、设二维随机变量(X,Y)的概率密度为-|||-f(x,y)= ) (e)^-x,0lt ylt x 0, .-|||-求

求指导本题解题过程，谢谢您！2.设二维随机变量(X,Y)的概率密度为-|||-f(x,y)= ) (e)^-x, 0lt ylt x 0, .-|||-

设二维随机变量(X,Y)的概率密度为-|||-f(x,y)= { (x+y),0leqslant xleqslant 2,0leqslant yleqslan

[题目]设二维随机变量(X,Y)的概率密度为-|||-f(x,y)= ) 2-x-y,0lt xlt 1,0lt ylt 1 0 .-|||-(1)求 (