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I got this wrong 3 times!!! You want to estimate the mean weight of quarters in circulation. A sample of 40 quarters has a mean

I got this wrong 3 times!!!
You want to estimate the mean weight of quarters in circulation. A sample of 40 quarters has a mean weight of 5.661 grams and a standard deviation of 0.059 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 grams. (Round to the nearest thousandth as needed.)

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