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Let in a series of 2n observations, half...

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 b in each of these observation, the mean and standard deviation of a new set become 5 and 20 respectively. Then the value of `a^2+b^2` is equal to :

A

650

B

425

C

925

D

250

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