Chapter 6, Problem 12PE

Write a program that takes as input five numbers and outputs the mean (average) and standard deviation of the numbers. If the numbers are $x_1,x_2,x_3,x_4\text{, and }{x}_5$, then the mean is $x=(x_1+x_2+x_3+x_4+x_5)/5$ and the standard deviation is:

$s=\sqrt{\frac{{(x_1-x)}^2+{(x_2-x)}^2+{(x_3-x)}^2+(x_4-x^2)+(x_5-x^2)}{5}}$

Your program must contain at least the following functions: a function that calculates and returns the mean and a function that calculates the standard deviation.