Question 64

The average weight of 38 students is 42 kg. It was found later that the figure of 46 kg was misread as 26 kg in one of the readings. What is the correct average? (correct to one decimal places)

Solution

given the average weight of 38 students is 42 kg

$$\frac{\left(sum\ of\ weights\right)}{38}$$ =42

sum of weights=1596

it was found that 46 is misread as 26

so we should add the value of 46-26=20 to the sum and find the average

$$\frac{\left(1596+20\right)}{38}$$

=>42.5

hence answer is option A

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