Question
The average age of a group of 22 persons is found
to be 20 years. Later it is found that age of two of the persons is calculated as 30 and 66 instead of 87 and 9. Find the correct average age of the group.Solution
Required average = {(22 × 20) – 30 – 66 + 87 + 9}/22 = 20 years
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