Suppose X, Y are random variables with joint density

f(x,y) = A^(3)xe^(-Ay) for 0<x<y

= 0 otherwise

a) What is the density of Y? What is E(Y)?

b) What is E(X|Y=1)?

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thanks in advance for your help!

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- December 4th 2007, 12:25 AMhanahouprobability: conditioning and densities
Suppose X, Y are random variables with joint density

f(x,y) = A^(3)xe^(-Ay) for 0<x<y

= 0 otherwise

a) What is the density of Y? What is E(Y)?

b) What is E(X|Y=1)?

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thanks in advance for your help! - December 4th 2007, 06:01 AMcolby2152