the mean of 9 observation was found to be 35 . leter on, it was discovered that an observation 81 was misread as 18 . find the correct mean of the observation
Answers
Answer:
Step-by-step explanation:
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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Step-by-step explanation:
⇒ Sum of observations = Mean ×Total number of observations
Given mean of 9 observations = 35
⇒ Sum of 9 observations=35 × 9
⇒ Sum of 9 observations = 315
For correct mean, we will subtract 81 and add 18to the sum.
correct mean = 315 - 81 + 18 = 252 = 234.36
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