Answer:
10 years
Explanation:
Add them all up and divide it by 10 because there are 10 swimmers
add them all up; should equal 100 divide by 10
============================================
Work Shown:
First add up all the ages
9+13+9+10+10+9+10+10+11+9 = 100
Then divide that sum by 10, since there are 10 values we added up
100/10 = 10
The average age is 10 years old.
3.3m questions
4.2m answers