The accompanying table shows proportions of adults in metropolitan areas, categorized as to whether they are public-radio contributors and whether or not they voted in the last election.

a. What is the probability that a randomly chosen adult from this population voted?
b. What is the probability that a randomly chosen adult from this population contributes to public radio?
c. What is the probability that a randomly chosen adult from this population did not contribute and did not vote?

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Voted Yes No Contributors 0.63 0.14 Noncontributors 0.10