The average of 9 observations was found to be 35. Later on, it was detected that

Question

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 :

Options:

A . 42

B . 28

C . 45

D . 32

Answer: Option A
Answer: (a)Correct sum of 9 observations = 9 × 35 – 18 + 81 = 315 + 63 = 378 ∴ Required correct average = $378/9$ = 42

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