A person conducting telephone surveys must get 3 more completed surveys before their job is finished. On each randomly dialed number, there is a 9% chance of reaching a person who complete the survey. a) What's the probability that the 3th completed survey occurs on the 10th call? b) What is the probability that in more than three completed surveys occur in 10 calls. c) Sketch a plot of the distribution of completed surveys in 10 calls specifying its mean value and standard deviation. (It is recommended to use formula for the mean and std)