: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? <p>

a.  55 <p>

b.  75 <p>

c.  65 <p>

d.  95 <p>

e.  85  <p>