Question: A sample of 25 new laptops from a certain model were tested for running time on a full battery. The sample gave the values =4.2x=4.2

A sample of 25 new laptops from a certain model were tested for running time on a full battery. The sample gave the values =4.2x=4.2 hours and =0.12s=0.12 hours. It is known that the running time for all laptops of this model follows a normal distribution.

Construct a 88% confidence interval for the population mean running time on a full battery for this laptop model.

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