Question

the mean of 9 observations was found to be 35 letter on it was revealed that an observation with Value 81 was misread as 18 find the correct mean of the observation

Answer 1

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Mean of 9 observations = 35

Misread observation= 18

Correct observation = 81

Then,

Sum of the 9 observations = (9 × 35) - 18 + 81

= 315 - 63

= 378

So,

Correct mean = 378/9 = 42

HOPE IT HELPS