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प्रश्न
There are 30 boys and 40 girls in a class. If the average age of boys is 10 yr and the average age of girls is 8 yr, then the average age of the whole class is
पर्याय
8 year
8.86 year
8.2 year
9 year
MCQ
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उत्तर
8.86 year
Explanation:
Average of 30 boys and 40 girls
`=(30xx10+40xx8)/(30+40)=(300+320)/70`
= 8.86 yr approx
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