# random variable and a probability distribution

1. Discuss the concepts of random variable and a probability distribution.

2. 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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#### Solution Summary

This solution clarifies random variables and probability distributions.

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