Chapter 12.4, Problem 18E

Find the expected values and the standard deviations (by inspection) of the normal random variables with the density functions given in Exercises 15–18.

$\frac{1}{5\sqrt{2\pi }}{e}^{-\left(\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.\right){\left[\raisebox{1ex}{$\left(x-3\right)$}\!\left/ \!\raisebox{-1ex}{$5$}\right.\right]}^2}$