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It is estimated that 1 in 5 preschool children in the US are in need of glasses. During a vision screening of 30 preschoolers that

It is estimated that 1 in 5 preschool children in the US are in need of glasses. During a vision screening of 30 preschoolers that previously reported no vision trouble, 5 children were identified as needing glasses. What is the probability that 5 or less children in the sample would need glasses?

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