the mean of nine ovservations was found to be 35.later on,it was discovered that an observation 81 was misread as 18.find the correct mean of the observations.
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mean of 9 observations=35
total sum of 9observations=35×9
=315
incorrect observation=315
correct observation=315-18+81
=378
correct mean=378/9
=42
total sum of 9observations=35×9
=315
incorrect observation=315
correct observation=315-18+81
=378
correct mean=378/9
=42
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