Assume that a set of test scores is normally distributed with a mean of 100

100 and a standard deviation of 20

20. Use the 68-95-99.7 rule to find the following quantities.

a. The percentage of scores less than 100

100 is

50

50 %.

(Round to one decimal place as needed.)

b. The percentage of scores greater than 120

120 is

16

16 %.

(Round to one decimal place as needed.)

c. The percentage of scores between 60

60 and 120

120 is

18.5

18.5 %.

(Round to one decimal place as needed.)