Question

Five children are the following ages: 12,13,11,11 and 13. What is their mean age?

Answer 1

12

Explanation:

add all the ages then divide by total number of different ages:12,13,11,11 and 13=60, 60/5=12

Answer 2

add all the ages up
60 divide by 5 = 12
the mean is 12