Question: On problem 3 section A and the Excel spreadsheets. I do not understand where the sample mean of 139.2 and the STD DEV 9.2 came

On problem 3 section A and the Excel spreadsheets. I do not understand where the sample mean of 139.2 and the STD DEV 9.2 came from. Can you please help me to understand how these calculations were found?

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