Chapter 10.5, Problem 61E

To graph Problems 59-62, use a graphing calculator and refer to the normal probability distribution function with mean $\mu$ and standard deviation $\sigma :$

$f\left(x\right)=\frac{1}{\sigma \sqrt{2\pi }}{e}^{-\left(x-\mu \right)}{}^{{}^2/2{\sigma }^2}$

Graph equation (1) with $\mu =20$ and

(A) $\sigma =2$

(B) $\sigma =4$

Graph both in the same viewing window with

$\text{Xmin = 0, Xmax = 40, Ymin = 0, and Ymax = 0}\text{.2}\text{.}$