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Suppose that X, Y and Z are discrete random variables, with the joint probability mass function (PMF) defined as ryz fxYz(x, y, z) 108 for

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Suppose that X, Y and Z are discrete random variables, with the joint probability mass function (PMF) defined as ryz fxYz(x, y, z) 108 for x = 1, 2, 3; y = 1, 2, 3; z = 1, 2 0 otherwise. (a) Find the marginal probability mass function (PMF) of Y. (b) Compute Cov(X, Y)

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