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The mean of 20 observations is 12.5. By error, one observation was noted as -15 instead of 15. Then the correct mean is ....

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The mean of 20 observations is 12.5. By error, one observation was noted as -15 instead of 15. Then the correct mean is ....

(A) 11.75

(B) 11

(C) 14 

(D) 13

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1 Answer

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The correct option is: (C) 14 

Explanation:

The incorrect sum of observations = 12.5 x 20 = 250

Now, correct sum = 250 - (-15) + 15 = 280

.'. Correct mean = 280/20 = 14

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