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1. Let f (x, y) = 6(1 y), 0 S x S y S 1 be the joint probability density function (p.d.f.) of X and

1. Let f (x, y) = 6(1 y), 0 S x S y S 1 be the joint probability density function (p.d.f.) of X and Y. a) Find E(X|Y = y). (y/Z) b) Use the answer derived in part (a) to nd E(X). (0.25)

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