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Standard XII

Chemistry

Significant Figures

In a class th...

Question

In a class there are 32 boys and 28 girls. The average age of the boys in the class is 14 years and the average age of the girls in the class is 13 years. What is the average age of the whole class? (Rounded off to two digits after decimal)

13.5

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13.53

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12.51

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13.42

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Solution

The correct option is D 13.53
The average age of the whole class
$\frac{32 \times 14 + 28 \times 13}{60} = \frac{812}{60} = 13.53$

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In a class there are 32 boys and 28 girls. The average age of the boys in the class is 14 years and the average age of the girls in the class is 13 years. What is the average age of the whole class? (Rounded off to two digits after decimal)

The correct option is D 13.53The average age of the whole class32×14+28×1360=81260=13.53

The correct option is D 13.53
The average age of the whole class
$\frac{32 \times 14 + 28 \times 13}{60} = \frac{812}{60} = 13.53$