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You want to estimate the mean weight of quarters in circulation. A sample of 40 quarters has a mean weight of 5.655 grams and a

You want to estimate the mean weight of quarters in circulation. A sample of 40

quarters has a mean weight of 5.655

grams and a standard deviation of 0.066

gram. Use a single value to estimate the mean weight of all quarters. Also, find the 95% confidence interval for the average weight of all quarters.

The mean weight of all quarters is approximately

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