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  3. The mean of 40 observations was 160. It was detected that the value of 165 was wrongly copied as 125. Find the correct mean.
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The mean of 40 observations was 160. It was detected that the value of 165 was wrongly copied as 125. Find the correct mean.

Answers (1)
D Deependra Verma

Mean (average) of 40 observations=160

Total sum (incorrect) of 40 observations= 40 imes 160 = 6400

Since, 165 was wrongly copied as 125

herefore Correct sum of 40 observations = 6400-125-165=6440

Correct mean=frac640040=161

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