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4.6.2 Let X ~ N(3, 5) and Y ~ N(-7, 2) be independent. (a) What is the distribution of Z = 4X - Y/3? (b)

4.6.2 Let X ~ N(3, 5) and Y ~ N(-7, 2) be independent. (a) What is the distribution of Z = 4X - Y/3? (b) What is the covariance of X and Z

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