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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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