The average of 9 observations was found to be 35. Later on, it was detected that an observation 81 was misread as 18. The correct average of the observations is

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The average of 9 observations was found to be 35. Later on, it was detected that an observation 81 was misread as 18. The correct average of the observations is

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answer is B.

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Detailed Solution

Average of 9 observations = 35

Total =9 x35 =315

Misread Difference = 81 - 18 = 63

New total= 315 + 63 = 378

Average $= \frac{378}{9} = 42$

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