Let (X, Y ) be a pair of jointly continuous random variables with joint p.d.f. f(X,Y )(x, y) = cxy, 0 ≤ y ≤ x ≤ 1. (a) Find the constant c > 0 so that f(X,Y ) is indeed a joint p.d.f.. (b) Find the marginal p.d.f.’s fX(x) and fY (y) for X and Y , respectively. Are X and Y independent? Explain your answer. (c) Find E(XY )

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