Multiple choice

The ages of $5$ children are $13, 15, 11, 9$ and $8$ years respectively. The average age is

  1. $10.2$
  2. $12.2$
  3. $11.2$
  4. $11$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Average = (13 + 15 + 11 + 9 + 8) / 5 = 56 / 5 = 11.2.

AI explanation

Using the average formula, the sum of the ages is 13 + 15 + 11 + 9 + 8 = 56. Dividing this sum by 5 gives 56 / 5 = 11.2. The average age is 11.2 years.