Question:
There are 30 boys and 40 girls in a class. Average age of boys = 10 years, average age of girls = 8 years. Find the average age of the whole class.
There are 30 boys and 40 girls in a class. Average age of boys = 10 years, average age of girls = 8 years. Find the average age of the whole class.
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Weighted average formula: \( \frac{\text{Sum of all values}}{\text{Total number}} \).
Updated On: Aug 11, 2025
- 8 yr
- 8.86 yr
- 8.2 yr
- 9 yr
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The Correct Option is B
Solution and Explanation
Total age of boys = \( 30 \times 10 = 300 \) years.
Total age of girls = \( 40 \times 8 = 320 \) years.
Total students = \( 30 + 40 = 70 \).
Total age = \( 300 + 320 = 620 \) years.
Average age = \( \frac{620}{70} = 8.8571 \approx 8.86 \) years.
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