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Calculation of Confidence Interval Limits

A researcher collected sample data for 17 women ages 18 to 24 . The sample had a mean serum cholesterol level (measured in mg/100 mL) of 188.8 , with a standard deviation of 5.5 . Assuming that serum cholesterol levels for women ages 18 to 24 are normally distributed, find a 90% confidence interval for the mean serum cholesterol level of all women in this age group.
what is the lower limit of confidence interval

What is the upper limit of confidence interval?

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The solution provides step-by-step calculation of Confidence Interval