Numerical grades for 5 students and 7 assignments are shown in Table P2.15. Create a spreadsheet that determines the average numerical grade for each of the students and then assigns a letter grade...

Numerical grades for 5 students and 7 assignments are shown in Table P2.15. Create a spreadsheet that determines the average numerical grade for each of the students and then assigns a letter grade (A, B, C, D, F) based on a 10-point scale (greater than or equal to 90 equals an A, greater than or equal to 80 and less than 90 equals a B, etc.).