In an article about investment alternatives, Money magazine reported that drug stocks provide a potential for long-term growth, with over 52% of the adult population of the United States taking prescription drugs on a regular basis. For adults age 65 and older, 83% take prescription drugs regularly. For adults age 18 to 64, 45% take prescription drugs regularly. The age 18-64 age group accounts for 86% 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?