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If 61% of eligible voters actually did vote, what is the probability the 1002 actually did vote?

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In a survey of 1002 people, 701 said that they voted in a recent presidential election. Voting records show that 61% of eligible voters actually did vote. Given that 61% of eligible voters actually did vote, find the probability that among 1002 randomly selected eligible voters actually did vote.

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p = 0.61, n = 1002

Mean = np = 1002 * 0.61 = 611.22

SD = ...

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