Published by:
CGP EDU Academic Team
Published on: August 13, 2026
SECTION- B
The mean and standard deviation of 15 observations were found to be 12 and 3 respectively. On rechecking it was found that an observation was read as 10 in place of 12 . If 
and 
denote the mean and variance of the correct observations respectively, then 
is equal to ………….
Text Solution
Verified by ExpertsThe correct answer is:
2521
(2521)
Let the incorrect mean be 
and standard deviation be 
We have
As per given information correct 
(correct mean) 
Also
Correct 
correct variance 
Required value
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