Adult Americans (18 years or older) were asked whether they

Adult Americans (18 years or older) were asked whether they used social media (Facebook, Twitter, and so on) regularly. The following table is based on the results of the survey.
18-34 35-44 45-54 Total 55+ Use social media 117 338 89 83 49 Do not use social media 33 66 36 192 57 Total 125 530 150

(a) What is the probability that a randomly selected adult American uses social media, given the individual is 18-34 years of age?
(b) What is the probability that a randomly selected adult American is 18-34 years of age, given the individual uses social media?
(c) Are 18- to 34-year olds more likely to use social media than individuals in general? Why?