Suppose that, for a certain mathematics class, the scores are normally distributed with a mean of 75 and a standard deviation of 9. The teacher wishes to give A's to the top 5% of the students and F's to the bottom 5%. The next 15% in either direction will be given B's and D's, with the other students receiving C's. What is the cumulative distribution? Grade A Percent 5% Cumulative % BCDF 15% % * % % 15% % 5% %