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If the manager of a bottled water distributor wants to​ estimate, with 95​% ​confidence, the mean...

If the manager of a bottled water distributor wants to​ estimate, with 95​% ​confidence, the mean amount of water in a​ 1-gallon bottle to within ±0.002 gallons and also assumes that the standard deviation is 0.05 ​gallons, what sample size is​ needed?

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