Question

mean of nine observations was 35.one observations 27 was taken for 18 correct mean​

Answer 1

Answer:

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 =

9

378

​

=42

Step-by-step explanation:

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Answer 2

Answer:

Mean of 9 observations = 35 (Given)

Sum of 9 observations = 35×9

Sum of 9 observations =315

since 81 was misread as 18

Then, sum of new observations =[315- (wrong observation)+(correct observation)]

= 315-18+81

= 315+63= 378

The correct mean = some of new observation/total number of observations

Correct mean= 378/9= 42

Hence, the correct mean is 42.

                                                                           

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