Mean of 30 observation is 12. One observation 47 was misread as 74 . Find the corrected mean .
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Mean of 30 observations is 12
Sum of observations = 30×12 = 360
One observation 47 is misread as 74
The Difference = 74 - 47 = 27
That means, the total 360 is 27 more than the actual total
Now,
Sum of new observations = 360 - 27 = 333
Now, the new mean = 330/30 = 11
Sum of observations = 30×12 = 360
One observation 47 is misread as 74
The Difference = 74 - 47 = 27
That means, the total 360 is 27 more than the actual total
Now,
Sum of new observations = 360 - 27 = 333
Now, the new mean = 330/30 = 11
Mathexpert:
Sorry...the answer should be 333/30 = 11.1
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