Published by:
CGP EDU Academic Team
Published on: August 13, 2026
The mean and standard deviation of 20 observations are found to be 10 and 2, respectively. On respectively, it was found that an observation by mistake was taken 8 instead of 12. The correct standard deviation is
A
B
1.8
C
D
1.94
Text Solution
Verified by ExpertsThe correct answer is:
C
Mean 
If 8 is replaced by 12 , then 
Correct mean 
Standard deviation 
Variance 
Now, replaced '8' observations by '12'
Then, 
Variance of removing observations
Correct standard deviation
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