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The positive random variable X is said to be a lognormal random variable with parameters / and o' if log(X ) is a normal random

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The positive random variable X is said to be a lognormal random variable with parameters / and o' if log(X ) is a normal random variable with mean / and variance o'. a) Use the normal moment generating function to find the mean and variance of a lognormal random variable. b) Given the density function fz(=) =1/2exp(-/z/} , -00

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