Q4 The time it takes to repair a personal computer is a random variable whose density, in hours, is given by 0 < x < 2 f (x) = otherwise The cost of the repair depends on the time it takes and is equal to 40 + 30x when the time is x. Compute the expected cost to repair a personal computer.

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Q: Suppose that f (x) = 0.125x for 0 < x < 4 %3D Determine the mean and the variance of X.

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