Write a program to find the variance of a list of $n$ numbers. First you have to take the value $n$ as input from the user, which is an integer. Then you have to take $n$ real numbers as input from the user. Then print out the variance $({}^2).$ Show $4$ digits after the decimal point. Recall that:

${}^2=\frac{{\displaystyle \underset{i=1}{\overset{n}{}}}(x_i-x_{\text{a}\text{v}\text{g}}{)}^2}{n}$

$($Hint: Expand the term inside the square...$)$

$20$