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Suppose a sample of 20 citizens in Shakerland is selected as a part of a study of people's opinion about the new product introduced last

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Suppose a sample of 20 citizens in Shakerland is selected as a part of a study of people's opinion about the new product introduced last year. Based on the sales of the product last year, it is believed that around 75% of Shakerland citizens are satisfied with the product and the rest are not satisfied. What is the probability that exactly 4 of the people surveyed are not satisfied with the new product? Explain

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