Let in a series of 2n observations, half of them are equal to a and remaining half are equal to –a. Also by...

Question

Let in a series of 2n observations, half of them are equal to a and remaining half are equal to –a. Also by adding a constant b in each of these observations, the mean and standard deviation of new set become 5 and 20, respectively. Then the value of a^2+b^2 is equal to :

Accepted Answer

(A)

JEE Main 2021 Mathematics question

Solution