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1. Let X1, X2, X3, X4, and X5 be random variables with E(X;) = 6 and Var(X;) = 5. Let Y = _i=Xi a. Find

1. Let X1, X2, X3, X4, and X5 be random variables with E(X;) = 6 and Var(X;) = 5. Let Y = _i=Xi a. Find E(Y) and Var(Y) if the Xi are all independent. (4pt) b. Find E(Y) and Var(Y) if Cov(Xi ,X ) = 2 for i # j (4pt)

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