Suppose that the diameter of a metal cylinder has a

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Suppose that the battery failure time, measure in hours, has probability density function given by: f(x) = 2 / (x +1)3 x?0.

What is the first quartile of X?

Suppose that the diameter of a metal cylinder has a probability density function given by: f(x) = 1.5 - 6( x - 50)2 for 49.5 ? x ? 50.5 mm

What is the variance of the diameter?

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