Question

1. the haig family has three boys aged 7, a girl aged 14 and a boy aged 15. what is the mean (average) of the ages of the children?

Explanation:

Step1: Calculate total age

$3\times7 + 14+15=21 + 14+15 = 50$

Step2: Calculate number of children

$3 + 1+1=5$

Step3: Calculate the mean

$\frac{50}{5}=10$

Answer:

10