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In a city, assume 25% of citizens are smokers. When 20 people in the city are...

In a city, assume 25% of citizens are smokers. When 20 people in the city are randomly surveyed, find each of the following probabilities.

(a) What is the probability that exactly 6 peoples are smokers?

(b) [What is the probability that at least 3 people are smokers?

Math   Statistics-And-Probability   
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