The percentage of adult users of the Internet who use social media has increased over time. Of adult Internet users age 1849, 79% use social media. Of adult Internet users age 50 and older, 55% use social media. Assume that 52% of adult Internet users are age 1849. (a) What is the probability that a randomly selected adult user of the Internet is age 50 or older? S (b) Given that an adult Internet user uses social media, what is the probability that he/she is age 1849? (Round your answer to four decimal places.) S