Confidence Interval for Time Spent on Computer Terminals

In order to estimate the average time spent on the computer terminals per student at a local university, data were collected for a sample of 81 business students over a one week period. Assume the population standard deviation is 1.8 hours. If the sample mean is 9 hours, then the 95% confidence interval is?

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....96. So, a 95% confidence interval for the population mean ...