Find mean and standard deviation of statistic, Mathematics

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Find mean and standard deviation of statistic

Historically about 51% of babies born in United States are boys. Which is, we know that p=0.51. The survey plans to study 650 randomly selected newborns. Find mean and standard deviation of statistic p hat, sample proportion who are boys? Use Normal approximation to determine probability which p hat would be less than 0.5.

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Mathematics: Find mean and standard deviation of statistic

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