The percentage of adult users of the Internet who use Facebook has increased over time (Pew Research internet Project, 2013). of adult Internet users age 18-49, 81% use Facebook. of adult Internet users age 50 and older, 54% use Facebook. Assume that 52% of adult Internet users are age 18-49.
a. What is the probability that a randomly selected adult user of the Internet is age 50 or older?
b. Given that an adult Internet user uses Facebook, what is the probability that he/she is age 18-49?