Suppose thatXis a random variable for which the m.g.f. is as follows: (t) = 1/4 (3et +
Question:
ψ(t) = 1/4 (3et + e−t ) for −∞ < t < ∞.
Find the mean and the variance of X.
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Related Book For 
Probability And Statistics
ISBN: 9780321500465
4th Edition
Authors: Morris H. DeGroot, Mark J. Schervish
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