Let x and y be discrete random variables with joint pdf fx
Let X and Y be discrete random variables with joint pdf f(x, y) = 4/(5xy) if x = 1, 2 and y = 2, 3, and zero otherwise. Find:
(a) E(X).
(b) E(Y).
(c) E(XY).
(d) Cov(X, Y).
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