3.8

Develop an M-file function that is passed a numeric grade from 0 to 100 and returns a letter grade according to the scheme:

LETTER	CRITERIA
A	90 numeric grade 100
B	80 numeric grade < 90
C	70 numeric grade < 80
D	60 numeric grade < 70
F	numeric grade < 60

The first line of the function should be

function grade = lettergrade(score)

Design the function so that it displays an error message and terminates in the event that the user enters a value that is less than zero or greater than 100. Test your function with 89.9999, 90, 45, and 120.

Note: Existing solution on Chegg is not helpful and cannot get it to work. Please provide a detailed explanation on how to run and save function in addition to the test run. Thank you.