Question

. The average weight of a group of 20 boys was calculated to be 89.4. It was later discovered that one
weight was misread as 78 kg instead of the correct one of 87 kg. Calculate the correct average weight.
Corrected Mean
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Answer 1

Explanation:

•The average weight of a group of 20 boys was calculated to be 89.4 kg and it was later discovered that one weight was misread as 78 kg instead of 87 kg. The correct average weight is 20. 1). The mean of 50 numbers is 30.

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Answer 2

Difference in weight =87−78=9kg

∴ Correct average weight =89.4+

20

9

=89.4+0.45=89.85kg

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