Suppose that X and Y are random variables such that E(X) = 4, E(Y) = 2 and var(X) = var(Y) = 4. Let Z=X+Y.Find E(Z) (1 dp)Assuming that X and Y are statistically independent find var(Z) (1 dp)Assuming that cov(X,Y) = 2 find var(Z) (1dp)
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