Published by:
CGP EDU Academic Team
Published on: August 23, 2026
Let in a series of 
observations, half of them are equal to a and remaining half are equal to - a. Also by adding a constant 
in each of these observations, the mean and standard deviation of new set become 5 and 20, respectively. Then the value of 
is equal to:
Text Solution
Verified by ExpertsThe correct answer is:
A
Let observations are denoted by 
for 
and 
Now, adding a constant 
then 
and 
(No change in S.D.) 
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