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3 - (15 pts) Let X and Y be two independent normally distributed random variables such that each has mean 1 and standart deviation 5.

3 - (15 pts) Let X and Y be two independent normally distributed random variables such that each has mean 1 and standart deviation 5. a. Find the mean E[X+2Y] and the variance Var[X+2Y]. b. Compute P(X+2Y

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