When an adult is randomly selected, there is a 0.85 probability that this person has a Facebook account. We select 20 random adults. (a) Does the situation describe a binomial distribution? Explain how you know. (b) What is the probability that exactly 15 adults have a Facebook account? (c) What is the probability that at least 15 adults have a Facebook account? (d) Calculate and interpret the mean in the context of this problem. (e) Calculate and interpret the standard deviation in the context of this problem.