Published by:
CGP EDU Academic Team
Published on: August 14, 2026
The mean and variance of 10 observations are found to be 10 and 4 respectively. On rechecking it was found that an observation 8 was incorrect. If it is replaced by 18, then the correct variance is
A
7
B
8
C
9
D
Text Solution
Verified by ExpertsThe correct answer is:
C
9
= 1300
Var (new) = 
= 130 - 121 = 9
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