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In a recent survey, 80% of the community favored building a police substation in their neighborhood. If 20 citizens are chosen, what is the mean

In a recent survey, 80% of the community favored building a police substation in their neighborhood. If 20 citizens are chosen, what is the mean and standard deviation for the number favoring the substation? Also, find the probability that 12 or fewer people favor building a police substation in their neighborhood.

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