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need help with stats, please

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sonpham
 
Reply Wed 5 Oct, 2011 09:14 pm
suppose X and Y are continuous random variables with joint pdf
f(x,y)=4(x-xy) if 0<x<1 , 0<y<1
and zero otherwise
a/ find E(X-Y)
b/ find Var(X-Y)
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