According to the document Current Population Survey, published by the U.S. Census Bureau, 31.6% of U.S. adults 25 years old or older have a high school degree as their highest educational level. If 100 such adults are selected at random, determine the probability that the number who have a high school degree as their highest educational level is

a. Exactly 32.
b. Between 30 and 35, inclusive.
c. At least 25.