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May 13th 2010, 12:18 PM #1

dori1123

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Sep 2008

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166

moment generating function

The moment generating function of $X$ is $M_X(t)=\frac{5}{(1-t)^2}$ . Let $Y=3(\frac{5}{7})^X$ . Find $E(Y)$ .
I don't know how to find the moment generating function of $Y$ , some help please?

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