Question
The average of 11 observations is 60. If the average of
first five observations is 58 and that of last five is 56, the sixth observation isSolution
Average of 11 observations = 60
Average of first 5 observations = 58
Average of last 5 observations = 56
Total of 11 observations=11×60=660
Total of first 5 observations=5×58=290
Total of last 5 observations=5×56=280
Now, add the total of the first 5 and last 5: 290 + 280 = 570
Required answer = 660 − 570 = 90
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