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I'm trying to use moments to find the mean of a pdf.

Here is the pdf:

[tex]f(x|\theta) = 2 \theta^{-2}x^3 exp(\frac{-x^2}{\theta})[/tex]

I'm not really sure where to start. I can multiply the pdf by X and then integrate with respect to X, but it gives me the wrong answer.

Any ideas?

Thanks.

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# Integration to find moments

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