79% of all Americans live in cities with population greater than 100,000 people. If 40 Americans are randomly selected, find the probability that a. Exactly 31 of them live in cities with population greater than 100,000 people. b. At most 31 of them live in cities with population greater than 100,000 people. c. At least 33 of them live in cities with population greater than 100,000 people.

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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79% of all Americans live in cities with population greater than 100,000 people. If 40 Americans are randomly selected, find the probability that

a. Exactly 31 of them live in cities with population greater than 100,000 people.
b. At most 31 of them live in cities with population greater than 100,000 people.
c. At least 33 of them live in cities with population greater than 100,000 people.
d. Between 27 and 34 (including 27 and 34) of them live in cities with population greater than 100,000 people.

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