the mean of 100 observations is 40. it was found that one observation was misread as 83 instead of 53 . the correct mean is ,??
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The sum of 100 observations = 100×40=4000
Difference due to mis read is =83-53=30
Thus sum will reduce by= 4000-30=3970
Mean = 3970/100=39.7
Difference due to mis read is =83-53=30
Thus sum will reduce by= 4000-30=3970
Mean = 3970/100=39.7
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