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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