# Question

Everyone knows that exercise is important. Recently, employees of one large international corporation were surveyed and asked, How many minutes do you spend daily on some form of rigorous exercise? From a random sample of 25 employees, the \mean time spent on vigorous daily exercise was 28.5 minutes. The standard deviation was found to be 6.8 minutes. Find a 90% interval estimate of the mean daily time spent on rigorous exercise by all employees.

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