4.7 A scale measuring ageism (age discrimination) has been administered to a large sample of human resources managers at major corporations. The distribution of scores is approximately normal with a mean of 31 and a standard deviation of 5. What percentage of the sample had scores

a. below 20? _____

b. below 40? _____

c. between 30 and 40? _____

d. between 35 and 45? _____

e. above 25? _____

f. above 35?