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Suppose that joint discrete random variables, X and Y, where E[X], E[Y], ox, and oy are all greater than zero. If X and Y are

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Suppose that joint discrete random variables, X and Y, where E[X], E[Y], ox, and oy are all greater than zero. If X and Y are independent, which of the following statements must be true? Select all that apply. D a. E[X].= E[Y] ( b. E[XY] = 0 O c. PXY = 0 D d. Cov(X,Y) = 0 De. ox = oy

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