Let $X$ be a random variable that is normally distribted with mean $\mu$ and variance $\sigma^2$. Compute
- $E(X^2)$
- $E(X^4)$
- $Var(X^2)$
They also hint that for a standard normally distributed random variable $Z$ it follows that $E(Z^4)=3$.
I don't see how to use the hint given