Question
The average age of a group of 20 persons is found
to be 27 years. Later it is found that age of two of the persons is calculated as 25 and 30 instead of 55 and 20. Find the correct average age of the group.Solution
Required average = {(20 × 27) – 25 – 30 + 55 + 20}/20 = 28 years
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