Problem 2-27

In an article about investment alternatives, Money magazine reported that drug stocks provide a potential for long-term growth, with over 50% of the adult population of the United States taking prescription drugs on a regular basis. For adults age 65 and older, 82% take prescription drugs regularly. For adults age 18 to 64, 49% take prescription drugs regularly. The 18 - 64 age group accounts for 83.5% of the adult population (Statistical Abstract of the United States, 2008).

a:) What is the probability that a randomly selected adult is 65 or older? If required, round your answer to three decimal places. P(A)= _________________________

b:) Given that an adult takes prescription drugs regularly, what is the probability that the adult is age 65 or older? If required, round your answer to four decimal places.

P (A|D)= _____________________________________