A variable containing student grades for assessments in a glass has been stored in the file studentgrades.mat. Download this file to the folder you use for MATLAB. Import this file using the command from Chapter 2 of your textbook. (Do not use the import command!) You should see a variable called gradesr in the workspace window. This 2-dimensional array contains the grades from 11 assessments for 25 students in the class (each row refers to a student and each column refers to an assessment). Using a single MATLAB command, determine the average score for each assessment (you should have a vector containing 11 values). The letter grades are determined using the top ten assessment scores. Using a single MATLAB command, find the total for each student by dropping the lowest assessment score for that student (you should have a vector containing 25 values).

The professor assigns letter grades using the following criteria (each assessment is worth 50 points):

>= 460 A

< 460 and >= 450 A-

< 450 and >= 440 B+

< 440 and >= 410 B

< 410 and >= 400 B-

< 400 and >= 390 C+

< 390 and >= 350 C

< 350 and >= 300 D

< 300 F

Using the find and length commands determine the number of each letter grades (do not use a loop!). You should be creating 9 new variables.