The mean of 100 observations is 40. It is found that an observation 84 was misread as 48. Then the correct mean is ?
Solution
Correct Answer: Option A
Given,
mean of 100 observations is 40
=> Total of 100 observations = 40 \(\times\) 100 = 4000
84 is misread as 48
=> Difference = 84 - 48 = 36
=> Now, new total of 100 observations = 4000 + 36 = 4036
Correct Mean = 4036 \(\div\) 100 = 40.36
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