Getting the m.g.f requires using a definition. Do you know what that definition is? Where do you get stuck in using it?
Read http://www.mathhelpforum.com/math-he...stion-2-a.html for getting mean and variance.
Let f(x) = (1/6) x^3 e^(-x) for 0 < x < +infinity.
Find the m.g.f. M(t) , and the values of mu and sigma squared.
Getting the m.g.f requires using a definition. Do you know what that definition is? Where do you get stuck in using it?
Read http://www.mathhelpforum.com/math-he...stion-2-a.html for getting mean and variance.