Julia enjoys jogging. She has been jogging over a period of several years, during which time her physical condition has remained constantly good. Usually she jogs 2 miles per day. The standard deviation of her time is 1.80 minutes. She has a random sample of 90 runs. The sample mean of the runs was 15.61 minutes.  find the 80% confidence interval for the population mean time for Julie to run 2 miles.

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