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2. The pmf of a random variable X is given as for x = -1; for x = 0; Px(X) = for x = 1;

2. The pmf of a random variable X is given as for x = -1; for x = 0; Px(X) = for x = 1; for x = 2; Determine the mean and variance of Y where Y = 2X + 1

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