Question
The average age of a group of 20 persons is found
to be 30 years. Later it is found that age of two of the persons is calculated as 32 and 64 instead of 87 and 9. Find the correct average age of the group.Solution
Required average = {(20 × 30) – 32 – 64 + 87 + 9}/20 = 30 years
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