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Statistic problem, please answer clearly, thanks 4. (25pts) (a) Suppose the random variable X has pdf f(x) = 6x/(1 + x),x > 0. Find the

Statistic problem, please answer clearly, thanks

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4. (25pts) (a) Suppose the random variable X has pdf f(x) = 6x/(1 + x),x > 0. Find the pdf of Y = 1/(1 + X). (b) Let X1 and X2 ba a random sample of size 2 from the exponential distribution with pdf f(x) = de-Ax, x > 0. Find the pdf of U = X1/ X2

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