- #1
roadworx
- 21
- 0
Hi,
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.
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.