Can someone explain to me how this problem works?
Given the moment generating function Mx(t)=e^(3t+8t^2), find the moment generating function of the random variable Z=1/4(X-3) and use it to determine the mean and the variance of Z.
I don't understand why its asking you to find another mgf if one is given to you already. Thanks!
In fact, it's the same result that I refered you to in my first reply. Did you in fact bother to click on the link and look at it?