Please show work in MATLAB

4.3 (25 points) Write a function called classAverage that takes in an aray of numbers and, after normalizing the grades in such a way that the highest corresponds to 100, retums the letter grade of the class average. This curve is the same method used to generate normTests in Chapter Problem 2 The grade ranges are as follows: average>-90-A 80 B 70 C 60 D average F For example: classAverage( 170 87 95 80 80 78 85 90 66 89 89 100]) should return B Test your program for the following two cases: classAverage [50 90 61 82 75 92 81 76 87 41 31 98]) classAverage [10 10 11 32 53 12 34 74 31 30 26 22]) Answer: Function File