Grading on a curve. An instructor grades on a curve by assuming that grades on a test are normally..

Grading on a curve. An instructor grades on a curve
by assuming that grades on a test are normally distributed. If the average
grade is 70 and the standard deviation is 8, find the test scores for each
grade interval if the instructor assigns grades as follows: 10% A’s, 20% B’s,
40% C’s, 20% D’s, and 10% F’s.