How do I compare ages using mean and median. For the first group 12 was both the mean and the median while for the second group, 16 was the mean while 18.5 was the median.

Answer 1

looks like the 2nd group were generally older.

Answer 2

How would I explain that using the mean(s) and median(s)?

Answer 3

the mean is the average age. The median is the central value.

Assuming a similar distribution of ages, a higher mean or median will indicate a higher group of numbers.