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Practice Exams and Their Solutions Based on

4 Probability 9. Let W 1 and W 2 be independent discrete random variables, each having the probability function given by f(0) = 1 2, f(1) = 1 3, and f(2) = 1 6. Set Y = W 1 +W 2. (a) Determine the mean, variance, and standard deviation of Y.

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