Option $3$: Write a program that will read in grades, the number of which is also input by the user. The program will find the sum of those grades and pass it$,$ along with the number of grades, to a function which has a $$pass by reference$$ parameter that will contain the numeric average of those grades as processed by the function. The main function will then deter$-$ mine the letter grade of that average based on a $10-$point scale.

$$

$90100$ A

$8089$ B

$7079$ C

$6069$ D

$059$ F

$$

Sample Run:

Enter the number of grades

$3$

Enter a numeric grade between $0-100$

$90$

Enter a numeric grade between $0-100$

$80$

Enter a numeric grade between $0-100$

$50$

The grade is C

$$in C$++$