A university found that 26% of its students withdraw without campleting the introductory statistics course. Assume that 20 students registered for the course. If required, round your answer to four decimal places. (a) Compute the probability that 2 or fewer will withdraw. (b) Compute the probsbility that exactly 4 will withdraw. (c) Compute the probability that more than 3 will withdraw. (d) Compute the expected number of withdrawals