Suppose that, for a certain exam, a teacher grades on a curve. (Let scores 2 or more standard deviations below the mean equal
an F, scores 1 to 2 standard deviations below the mean equal a D, scores between 1 standard deviation below and above the
mean equal a C, scores between 1 and 2 standard deviations above the mean equal a B, and scores 2 or more standard
deviations above the mean equal an A.)
2.2%
2.2%
34.1% 34.1%
0.1%
0.1%
13.6%
13.6%
-30 μ-20 μ-lo μ
+lo +20 +3σ
It is known that the mean is 70 and the standard deviation is 5. There are 40 students in the class. (Round your answers to the
nearest whole number.)
(a) How many students should receive a C?
student(s)
(b) How many students should receive an A?
student(s)