for the average age form a 95% confidence interval what distribution should I use, critical value, error value, lower and upper bound. not sure what to do or how to figure this out. please help.

Age Gender For the following questions, use only the "age" column: LL m Points Age Frequency Distribution: Class Width on Class Limits Relative Cumulative Low High Midpoint Freq. Frequency Relative Freq Limits co 22.5 0.3043 0.3043 NID Freq. 31.5 0.2609 0.5652 Mid. N N N N H 40.5 0.2174 0.7826 49.5 0.0435 0.8261 58.5 0.1739 1.0000 N Mean 35.35 *Round to two decimals Median 31 *Round to one decimal N NN NN m Sample Standard deviation: 12.80 *Round to two decimals *Round to one decimal 44 *Round to one decimal Ogive: Ogive: mm LL Polygon Relative Frequency Ogive for Student Age LL LL 1.2000 LL Total