The U.S. population by age is as follows (The World Almanac 2004). The data are in millions of people.

4-21: The U.S. population by age is as follows (The World Almanac 2004). The data are in millions of people.

AgeNumber

19 and under    80.5

20 to 24    19.0

25 to 34    39.9

35 to 44   45.2

45 to 54    37.7

55 to 64    24.3

65 and over 35.0

Assume that a person will be randomly chosen from this population.

a. What is the probability the person is 20 to 24 years old?

b. What is the probability the person is 20 to 34 years old?

c. What is the probability the person is 45 years or older?