I need Someone to help me or show me what I need to do for the average to print out correctly

output is:
Connie has an average grade of 85.33 You will receive a B in this class.
James has an average grade of 92.00 You will receive a A in this class.
Susan has an average grade of 52.33 You will receive a F in this class.
Jake has an average grade of 66.33 You will receive a D in this class.
Karen has an average grade of 77.33 You will receive a C in this class.
Bill has an average grade of 99.00 You will receive a A in this class.
Fred has an average grade of 85.33 You will receive a B in this class.
Cheryl has an average grade of 75.00 You will receive a C in this class.
Pam has an average grade of 65.00 You will receive a D in this class.
Steve has an average grade of 45.00 You will receive a F in this class.
John has an average grade of 86.33 You will receive a B in this class.
David has an average grade of 81.67 You will receive a B in this class.
Corina has an average grade of 91.67 You will receive a A in this class.
Delia has an average grade of 74.00 You will receive a C in this class.
Evan has an average grade of 99.00 You will receive a A in this class.

Overall Class Average is 21.67 ****HERE'S THE PROBLEM*****

The following lists the number of students earning each letter grade:

Number of A's = 4
Number of B's = 4
Number of C's = 3
Number of D's = 2
Number of F's = 2

The following program generates 3 random numbers, then averages them.

Basically, you need to create another variable that is going to sum all your subjects or averages and then calculate. The formula that you use is incorrect.