Question

mean of 9 observations was found to be 35 later on it was detected that an observation 81 was misread as 18 then find out the correct mean of the observation

Answer 1

Answer:

Step-by-step explanation:

=> Mean of 9 observations = 35

=> 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

Answer 2

Step-by-step explanation:

SUM OF 9 OBSERVATIONS=35×9=315

CORRECT SUM OF 9 OBSERVATIONS =315+(81-18)

=315+63

=378

CORRECT MEAN=378/9=42

SUM OF NINE NUMBERS=26×9=234

SUM OF EIGHT NUMBERS=27×8=216

THE INCLUDED NUMBER=234-216=18

SO THE CORRECT MEAN OF OBS=18

MARK AS BRAINLIEST