Published by:
CGP EDU Academic Team
Published on: August 23, 2026
The mean and standard deviation of 15 observations are found to be 8 and 3 respectively. On rechecking it was found that, in the observations, 20 was misread as 5 . Then, the correct variance is equal to
Text Solution
Verified by ExpertsThe correct answer is:
17
(17)
We have Variance 
Now, as per information given in equation 
Now, the new 
And, new 
Variance 
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