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 78kg instead of 87 kg. The correct average weight is ?->(Show Answer!)

1. 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 78kg instead of 87 kg. The correct average weight is

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By: anil on 05 May 2019 02.00 am

Total weight with misreading = $$20 imes 89.4 = 1788$$
(87-78=9) should be added to correct the total = 1788+9 = 1797
Hence correct average will be $$frac{1797}{20} = 89.85$$

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