A moviegoer is defined as a person who goes to the movies at least once a month. From the article Hollywood Demographics on the Indiewire website, we obtained the following data on moviegoers in the United States and Canada. The first two columns provide an age distribution; the third column gives the percentage of people in each age group who are moviegoers.

A person from among those living in either the United States or Canada is selected at random.
a. Find the probability that the person is a moviegoer.
b. Find the probability that the person is between 18 and 24 years old, given that he or she is a moviegoer.
c. Interpret your answers in parts (a) and (b) in terms of percentages.

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Age group Percentage of Percentage population moviegoers (years) 2-11 12-17 18-24 25-39 14 13 12 10 21 14 14 19 10 50-59 60 & over