Mean of 20 observations is 15.5. later it was found that the observati – InterviewSolution

1.

Mean of 20 observations is 15.5. later it was found that the observation 24 was misread as 42. Find the correct mean.

Answer»

Sum of 24 observations = 15.5 * 24 = 372

Mistake = 42 - 24 = 18

So actual sum = 372 -18

= 354

Correct mean = 354 / 24

= 14.75

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