Question
The average age of a group of 20 persons is found to be
26 years. Later it is found that age of two of the persons is calculated as 30 and 60 instead of 50 and 20. Find the correct average age of the group.Solution
Required average = {(20 × 26) – 30 – 60 + 50 + 20}/20 = 25 years
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