As a college professor teaching a difficult lower division course you have decided on the following distribution of grades: A, upper 10%; B, next 20%; C, next 50%; D, next 15%; F, lowest 5%. The class (population) average number of points at the end of the quarter is 923 with a standard deviation of 101. Determine the number of points needed for each letter grade.

4.9) As a college professor teaching a difficult lower division course you have decided on the following distribution of grades: A, upper 10%; B, next 20%; C, next 50%; D, next 15%; F, lowest 5%. The class (population) average number of points at the end of the quarter is 923 with a standard deviation of 101. Determine the number of points needed for each letter grade