设二维随机变量(X,Y)的概率密度为f(x,y)=2,0<=x<=1,0<=y<=x,f(x,y)=0,其他,求E(X+Y)
急需答案:设二维随机变量(X,Y)的概率密度为f(x,y)=2,0<=x<=1,0<=y<=x,f(x,y)=0,其他,求E(X+Y)...
急需答案:
设二维随机变量(X,Y)的概率密度为f(x,y)=2,0<=x<=1,0<=y<=x,f(x,y)=0,其他,求E(X+Y) 展开
设二维随机变量(X,Y)的概率密度为f(x,y)=2,0<=x<=1,0<=y<=x,f(x,y)=0,其他,求E(X+Y) 展开
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