Historically 20 % of workers participate in a retirement plan. A group of 5 workers is randomly selected. What is the probability that exactly 2 workers participated in the retirement plan ?  What is the probability that at least 3 workers participated in the plan ?

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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Historically 20 % of workers participate in a retirement plan. A group of 5 workers is randomly selected. What is the probability that exactly 2 workers participated in the retirement plan ?  What is the probability that at least 3 workers participated in the plan ?  

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