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Question 64
The average of 15 numbers is 56. The average of first 8 numbers is 54.4 and that of last 8 numbers is 56.6. If $$8^{th}$$ number is excluded then what is the average of the remaining numbers? (correct to one decimal place)
Solution
Sum of 15 numbers=15*56=840
Sum of first 8 numbers=54.4*8=435.2
Sum of last 8 numbers=56.6*8=452.8
Sum of both=435.2+452.8=888
The eight number in the series=888-840
=48
Sum of the other 7 numbers=840-48
=792
Average of 14 numbers=792/14
=56.6
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