If the moment generating function of X is ,

(a) Find E(X)

(b) Find Var(X)

(c) P(6.1<X<6.7)

Thank you!

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- May 15th 2009, 07:50 PMredpackmoment generating
If the moment generating function of X is ,

(a) Find E(X)

(b) Find Var(X)

(c) P(6.1<X<6.7)

Thank you! - May 15th 2009, 09:38 PMmatheagle
This has been posted already.

X is an EXP rv with parameter .

Hence the mean and variance is 3 and 9.

Finally part (c) is . - May 15th 2009, 10:01 PMredpack
So E(X) is basically the same thing as the mean? Did you just square the parameter / mean to get the variance. For part c, using your equation, I got 0.023727. Thank you for your help.

- May 15th 2009, 10:16 PMmatheagle
- May 16th 2009, 12:12 AMIsomorphism
- May 16th 2009, 04:01 AMmr fantastic
First asked here: http://www.mathhelpforum.com/math-he...-function.html

Thread closed.