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9. (10 points] Sum of geometric random variables Suppose that X1: - - - ,an are independent Geometric random variables, each of which have an)

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9. (10 points] Sum of geometric random variables Suppose that X1: - - - ,an are independent Geometric random variables, each of which have an) 2 i: (a) {2 points) Find the expected value and the variance of the sum of the 500 rmrlorn variables. (b) {4 points} Find a good approximation for PUSH

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