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A university found that 30% of its students withdraw without completing the introductory statistics course. Assume that 20 students registered for the course.

Compute the probability that two or fewer will withdraw (to 4 decimals).

Compute the probability that exactly four will withdraw (to 4 decimals).

Compute the probability that more than three will withdraw (to 4 decimals).

Compute the expected number of withdrawals.

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