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4. Show that if X&Y are independent, then Cov(X, Y ) = 0 5. Use the previous problems to show that if X and

4. Show that if X&Y are independent, then Cov(X, Y ) = 0 5. Use the previous problems to show that if X and Y are independent, then Var(X + Y) = Var(X) + Var(Y)

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