Estimate the mean weight of quarters in circulation

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You want to you want to estimate the mean weight of quarters in circulation. A sample of 30 quarters has a mean weight of 5.649 grams in a standard deviation of 0.066 gram. Use a single value to estimate the mean weight of all quarters. Also, what would the 95% confidence interval for the average weight of all quarters be? what would the mean weight be for all the quarters in approximately grams be rounded to the nearest thousand?

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