You are interested in knowing the average age of onset for criminal activity. You ask a sample of 125 prison inmates how old they were the first time they committed a criminal or delinquent act. The average age reported was 14 with a population standard deviation of 2.4. Based on this information, calculate a 99% confidence interval for the population mean. You MUST show your work to receive credit. You can type it in the box, upload a .pdf or picture, or use the equation editor.

Interpret the value of the confidence interval.