The average age of 40 students is 21 years. It was observed that while calculating the
The average age of 40 students is 21 years. It was observed that while calculating the
average age, the age of a student was taken as 20 years instead of 30 years. What will
be the correct average age?
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Correct answer: (A) 21.25 years
Explanation
The total age rises by 30 − 20 = 10 years, so the average rises by 10/40 = 0.25. Correct average = 21 + 0.25 = 21.25 years.