13. For n 1, let Xn be a continuous random variable with the probability density function...

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13. For n ≥ 1, let Xn be a continuous random variable with the probability density function fn(x) =    cn xn+1 if x ≥ cn 0 otherwise. Xn’s are called Pareto random variables and are used to study income distributions.

(a) Calculate cn, n ≥ 1.

(b) Find E(Xn), n ≥ 1.

(c) Determine the density function of Zn = ln Xn, n ≥ 1.

(d) For what values of m does E(Xm+1 n ) exist?

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