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Point Estimate of the Population Mean and Margin of Error

How do I calculate the point estimate of the population mean and the margin of error for a 90% confidence interval. If I were given the example of lengths of running distances for 30 people (miles), such as 12, 18, 20, 15, 6, 8, 9, 10, 2, 1, 12, 33, 20, 18, 15, 15, 6, 9, 9, 10, 10, 12, 22, 24, 6, 7, 8, 8, 9, 10.

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