$(25$ points$)$ Write a MATLAB program to:

$-$ Prompt the user to enter numeric grades $($one at a time$)$ within a while loop. Any number of grades can be entered. The user should enter a negative number to indicate that there are no more grades.

$-$ Determine the number of grades in each grade range using a standard $10$ point scale: A $(90$ or higher$),\backslash (\backslash$mathrm$\{$B$\}(80-90),\backslash$mathrm$\{$C$\}(70-80),\backslash$mathrm$\{$D$\}(60-70)\backslash ),$ and $\backslash (\backslash$mathrm$\{$F$\}(0-60)\backslash ).$

$-$ Determine the maximum, minimum, and average grade.

$-$ Display the results including the number of grades, maximum grade, minimum grade, and the number of grades in each grade range.

$-$ Test the program for cases including $4$ grades, $10$ grades, and $20$ grades with the grades reasonably distributed between the grade ranges.