12. Facebook reports that 70% of their users are from out side the United States and that 50% of their users log on to Facebook every day. Suppose that 20% of their users are United States users who log on every day. a) What percentage of Facebook's users are from the United States? b) What type of probability is the 20% mentioned above? C) Construct a contingency table showing all the joint and marginal probabilities. d) What is the probability that a user is from the United States given that he or she logs on every day? 9) Are From United States and Log on Every Day indepen dent? Explain