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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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- 28
- 42
- 32
- 45
- 28
Correct Option: B
Given that , The average of 9 observations = 35
Later on, it was detected that an observation 81 was misread as 18 .
Correct sum of 9 observations = 9 × 35 – 18 + 81
Correct sum of 9 observations = 315 + 63 = 378
∴ Required correct average = 378 ÷ 9 = 42
