Question 28

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waecmaths question: 

Ages

1

2

3

4

5

Number of Children

2

3

5

6

4

The table shows the ages (in years) of twenty children chosen at random from a community

What is the mean age?

Option A: 

4.46 years

Option B: 

3.35 years

Option C: 

3.30 years

Option D: 

3.00 years

waecmaths solution: 

$\begin{align}  & \overline{x}=\frac{(2\times 1)+(2\times 3)+(3\times 5)+(4\times 6)+(5\times 4)}{2+3+5+6+4} \\ & \overline{x}=\frac{2+6+15+24+20}{20}=\frac{67}{20}=3.35 \\\end{align}$

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