The table shows the ages in years of twenty chi... - WAEC Mathematics 2007 Question
The table shows the ages(in years) of twenty children chosen at random from a community. What is the mean age? (\begin{array}{c|c} Age(years) & 1 & 2 & 3 & 4 & 5 \ \hline {\text {Number of children}} & 2 & 3 & 5 & 6 & 4 \end{array})
A
4.46 years
B
3.35 years
C
3.30years
D
3.00 years
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Correct Option: B
Mean(age) = (\frac{(1 \times 2) + (2 \times 3) + (3 \times 5) + (4 \times 6) + (5 \times 4)}{2 + 3 + 5 + 6 + 4})
= (\frac{2 + 6 + 15 + 24 + 20}{20})
= (\frac{67}{20})
= 3.35yrs
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