Question: 4. (Problem 9.18) Suppose that X is a normally distributed random variable, with mean 10 and variance 25. We take a simple random variable of

4. (Problem 9.18) Suppose that X is a normally distributed random variable, with mean 10 and variance 25. We take a simple random variable of size 4, that is, X1, .., X4. If W = 0.4X1 + 0.3X2 + 0.2X3 + 0.1X4, nd PI'(W > 12)

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