:2. The scores on a final exam follow the normal curve with an
average of 60 and an SD of 20. The instructor wishes to count
the top 20% of the scores as A's, with the rest of the scores as
B or lower. Which of the following final scores is the most
suitable cutoff between the A's and the B's?
a. 55

b. 75

c. 65

d. 95

e. 85