Question 37

The average height of 30 boys was calculated to be 150 cm. It was found later that for one boy 165 cm was wrongly copied as 135 cm during computation of the average. The correct average is

Solution

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The wrong total is $$30 \times 150 = 4500$$ cm. The correct total is $$4500 - 135 + 165 = 4530$$ cm. So the correct average is $$\frac{4530}{30} = 151$$ cm.

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