The data below are the ages of a random sample of 8 men in a bar. It is known that the population of ages are normally distributed with a standard deviation of 12. Determine the 91% confidence interval estimate of the population mean.

53,68,25,30,58,40,26,4853,68,25,30,58,40,26,48

Note: For each confidence interval, enter your answer in the form (LCL, UCL). You must include the parentheses and the comma between the confidence limits.

Confidence Interval =