A marketing firm would like to test-market the name of a new energy drink targeted at 18- to 29-year-olds via social media. A study by the Pew Research Center found that 35% of U.S. adults (18 and older) do not use social media (Pew Research Center website, October 2015). The percentage of U.S. young adults age 30 and older is 78%. Suppose that the percentage of the U.S. adult population that is either age 18-29 or uses social media is 67.2%.
a. What is the probability that a randomly selected U.S. adult uses social media?
b. What is the probability that a randomly selected U.S. adult is aged 18-29?
c. What is the probability that a randomly selected U.S. adult is 18-29 and a user of social media?