Question

Mean of 9 observation was found to be 35. Later on, it was detected that an observation 81 was misread as 18 , than the correct mean of the observation is _____
option - a) 40 , b) 41, c) 42 ,d) 43​

Answer 1

Answer:

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Answer 2

Answer:

c) 42

Step-by-step explanation:

Incorrect mean of 9 observations =35

Incorrect sum of observations =35×9=315

Since, 81 is misread as 18.

So, correct sum of observations

$315 - (18 + 81)$

=378

∴ Correct mean =

$378 \div 9$

=42

hope it helps

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