Question: Suppose thatXis a random variable for which the m.g.f. is as follows: (t) = 1/4 (3et + et ) for < t < .

Suppose thatXis a random variable for which the m.g.f. is as follows:
ψ(t) = 1/4 (3et + e−t ) for −∞ < t < ∞.
Find the mean and the variance of X.

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