Posted by **Anonymous** on Wednesday, April 24, 2013 at 12:58pm.

A study of 36 marathon runners showed that they could run at an average rate of 7.8 miles per hour. The sample standard deviation is 0.6. Find a point estimate of the population mean. Find the 90% confidence interval forthe mean of all runners. Based on the results, what minimum speed should a runner obtain to qualify to run in a marathon? answer

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