Question

A college professor teaches Chemistry 101 each fall to a large class of first-year students. For tests, she uses the standardized exams that he knows from past experience produce bell-shaped distributions with a mean of 70 and a standard deviation of 12. His philosophy of grading is to impose standards that will yield, in the long run, 14% A’s, 20% B’s, 32% C’s, 20% D’s and 14% F’s. Where should the cutoff be between the A’s and the B’s? Between the B’s and the C’s?

Answer 1