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Let X be a random variable with the following pdf: -x/4 fx (x ) = 4 0, elsewhere a) Find E(X) using the definitions of

Let X be a random variable with the following pdf: -x/4 fx (x ) = 4 0, elsewhere a) Find E(X) using the definitions of excepted value of a continuous random variable; b) Find E(X) and Var(X) using the moment generating function of X

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