Create a function to numerically integrate the equation using the Rectangle Method $($mid point$),$

$I=\frac{2}{\sqrt[\phantom{2}]{}}{\displaystyle \underset{a}{\overset{b}{}}}x{e}^{-x^2}$

The input would be in the sequence, $a,b,$ and $n.$ Name the function "rectangle$\_$method $(a,b,n)".$ The $"n"$ is

the number of rectangles.

Note: Do not call the function at the end of the script. The function should only output one value; suppress

all other outputs.

Answer: $($penalty regime: $0\%)$

function $[I]=$ rectangle$\_$method $(a,b,n)$

$\%$ Write your code here

end