Question
The average age of a group of 20 persons is found
to be 25 years. Later it is found that age of two of the persons is calculated as 30 and 60 instead of 70 and 20. Find the correct average age of the group.Solution
Required average = {(20 × 25) – 30 – 60 + 70 + 20}/20 = 25 years
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