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in an article about investment alternatives, money magazine reported that drug stocks provide a potential for long-term growth, with over 54% of the adult population of the united states taking prescription drugs on a regular basis. for adults age 65 and older, 85% take prescription drugs regularly. for adults age 18 to 64, 45% take prescription drugs regularly. the age 18–64 age group accounts for 84.5% of the adult population (statistical abstract of the united states, 2008).

round your answers to 4 decimal places.

a. what is the probability that a randomly selected adult is 65 or older?

b. given an adult takes prescription drugs regularly, what is the probability that the adult is 65 or older?