_26 The Weibull density function is given by 'e-y™ /a¸ y>0, f(y) = { a | 0, elsewhere, where a and m are positive constants. This density function is often used as a model for th lengths of life of physical systems. Suppose Y has the Weibull density just given. Find a the density function of U = Y™. b E(Y*) for any positive integer k.

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