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It is reported that 25% of the flights arriving at the Washington Dulles airport in January 2008 were late. Assume the population proportion is .25.

It is reported that 25% of the flights arriving at the Washington Dulles airport in January 2008 were late. Assume the population proportion is .25. What's the probability that the sample proportion will be within +-.03 of the population proportion if a sample size of 625 is selected?

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