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The average of 41 numbers is 63. The average of first 21 number is 61.5 and that of last 21 numbers is 65.5. if $$21^{st}$$ number is excluded then the average of remaining numbers is:
Sum of 41 numbers=63*41
=2583
Sum of first 21 numbers=21*61.5
=1291.5
Sum of last 21 numbers=21*65.5
=1375.5
Sum of 41 numbers and the 21st number=1291.5+1375.5
=2667
21st number in the series is =2667-2583
=84
Sum of 40 numbers=2583-84
=2499
Average=2499/40
=62.475
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