Question: College students mark an average of 11 calls per day on their cell phone 80 % of them have their parents pay the bill

a. What distribution can you use to model the number of calls?

b. If you select at random what is the probability that he or she makes more than 10 call? More than 15? More than 20?

c. If you select at random sample of 10 students what distribution method can you use to model the proportion of students who have their parents pay the bill

d. Of the model in (c) what is the probability that all 10 have parents that pay? at least 9? at least 8?