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The mean of 100 observations was calculated as 40. It was found later that one of the observations was misread as 83 instead of 53. The correct mean is ?
39
39.7
40.3
42.7
As the misread value is 83, Means 30 more is added to the result already.
So we need to remove this 30 from 100 Observations.
Hence, From 100 Observations, We need to remove 30 marks.
From every Observation we need to remove --------> 30/100 = 0.3 mark.
So Actual average = 40 - 0.3 = 39.7
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