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In the proof of Theorem 6 6 we twice differentiated the

In the proof of Theorem 6.6 we twice differentiated the moment– generating function of the normal distribution with respect to t to show that E(X) = µ and var(X) = σ2. Differentiating twice more and using the formula of Exercise 4.25 on page 129, find expressions for µ3 and µ4.

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