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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.

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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

Posted by

Deependra Verma

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