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5. X1 and X2 are independent and identically distributed (iid) random variables with MGF MX (t) = 1_172 eat a. Find E(Xi). (4pt) b. Let

5. X1 and X2 are independent and identically distributed (iid) random variables with MGF MX (t) = 1_172 eat a. Find E(Xi). (4pt) b. Let Y = X1 - X2 . Find the MGF of Y. (4pt) c. Find E(Y). (4pt)

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