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3. If X, Y, Z are random variable having means 5, -2, and 4, variances 1, 2, and 3, and cov(X, Y) = -2, cov(Y,

3. If X, Y, Z are random variable having means 5, -2, and 4, variances 1, 2, and 3, and cov(X, Y) = -2, cov(Y, Z) = 1, cov(Z, X) = -1 for W = 2X - 3Y + 4Z, U =3X - 2Y + 5Z, (i) Find E(U) (ii) Find cov(W, U)

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