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5 The independent random variables X1 and X2 are distributed normally. The mean of X1 = 30 and variance of X1 = 9 The mean

5 The independent random variables X1 and X2 are distributed normally. The mean of X1 = 30 and variance of X1 = 9 The mean of X2 = 40 and variance of X2 = 16 Find the mean and variance of: a X1 + X2 b X1 - X2

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