# moment generating function

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• May 13th 2010, 01:18 PM
dori1123
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?