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A university found that 25% of its students withdraw without completing the introductory statistics course.Assume that...

A university found that 25% of its students withdraw without completing the introductory statistics course.Assume that 20 students registered for the course.
a) calculate the probability that exactly four will withdraw.
b) calculate the probability that at most two will withdraw.
c) calculate the expected number of withdrawals.

Math   Statistics-And-Probability   
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Answer #1

Probability calculation by binomial probability distribution .

(a)  0.19

(b) 0.091

(c) Expected withdrawals is 5

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