Suppose that a random variable X has the F distribution with m and n degrees of freedom

Question:

Suppose that a random variable X has the F with m and n degrees of freedom (n > 2). Show that E(X) = n/(n − 2). Find the value of E(1/Z), where Z has the χ2 with n degrees of freedom.
Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...