ICSE Class 9 Answered
The mean of 12 boys is 10 years. It was found that the age of one boy was
taken as 14 years in the place of 12 years .Find the correct mean.
Asked by shreesamaira | 04 Oct, 2021, 12:05: PM
Expert Answer
Incorrect mean = 10
no. of boys =12
Incorrect sum of years = 12 x 10 = 120
Incorrect age = 14
Correct age = 12
Correct sum = 120 - 14 + 12 = 118
correct mean = Correct sum/no. of boys = 118/12 = 9.8333 years
Answered by Arun | 05 Oct, 2021, 09:42: AM
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