A university found that 20 of its students withdraw without
A university found that 20% of its students withdraw without completing the introductory statistics course. Assume that 20 students registered for the course.
a. Compute the probability that 2 or fewer will withdraw.
b. Compute the probability that exactly 4 will withdraw.
c. Compute the probability that more than 3 will withdraw.
d. Compute the expected number of withdrawals.

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