Suppose that the departmental final exam scores are normally distributed with a mean of 72 and a standard deviation of 9. Grades (A, B, C, D, F) are assigned according to the rule below. The top 10% receive an A. The next 20% receive a B. The middle 40% receive a C. The next 20% receive a D. The bottom 10% receive an F. Final Exam Grades 40% 20% 20% 10% 10% DC BA Points scored on final exam Find the lowest final exam score for a student to receive: A. an A B. a C C. a D 6:23 PM O e 9 8/11/2021 hp B