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From: "Nasser Abbasi" <nma@12000.org>
Newsgroups: comp.soft-sys.matlab
References: <fo26im$q2g$1@fred.mathworks.com>
Subject: Re: statistics
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Xref: news.mathworks.com comp.soft-sys.matlab:448959



"Hesham " <heltaher.nospam@mathworks.com> wrote in message 
news:fo26im$q2g$1@fred.mathworks.com...
> Hi all,
> I am looking for an approximation a formula for calculating
> the mean and variance of x , x^2 , x^3 , x^4 , when x is a
> random variable with normal distribution with ux & varx.
> If someone can help, please do.
> Thanks
> Hesham

In additions to the references mentioned, I have a table of functions of X 
for different distributions below. This was generated using Mathematica. 
(middle of the page). It contains the formula for E(f(x)) and Var( f(X)) 
(no approximation needed, these are exact formulas)

http://12000.org/my_notes/math_502_material/chart_of_distributions/HTML/chart_of_distributions.html

I have few other related statistics material on this page
http://12000.org/my_notes/math_502_material/index.htm

hth
Nasser