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)

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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