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Use the confidence interval to find the estimated margin of error. Then find the sample mean. A biologist reports a confidence interval of (2.9,3.9)

Use the confidence interval to find the estimated margin of error. Then find the sample mean. A biologist reports a confidence interval of (2.9,3.9) when estimating the mean height (in centimeters) of a sample of seedlings. The estimated margin of error is

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