Suppose that, for a certain exam, a teacher grades on a curve. Frequency 2.2% 0.1% 34.1% 34.1% 2.2% 0.1% 13.6% 13.6% u-30 1-20 u-lo u utlo u+20 u+30 It is known that the mean is 55 and the standard deviation is 10. There are 45 students in the class. (Round your answers to the nearest whole nu (a) How many students should receive a C? student(s) (b) How many students should receive an A? student(s)