Write a program to allow multiple sets of scores to be averaged. Valid entries must be numeric and in the range of 0 through 100.

Calculate the average of the scores entered. Allow any number of scores to be entered per data set but assume that there will be at least one score entered. Use a sentinelcontrolled loop variable to terminate the loop. After values are entered and the average is calculated, test the average to determine whether an A, B, C, D, or F should be recorded. The scoring rubric is as follows:

A→90–100; B→80–89; C→70–79; D→60–69; F < 60.