Let in a series of 2n observations |Statistics|JEE MAIN 2021

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JEE MAIN 2021

18-03-21 S2

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 :

Select the correct option:

A

425

B

650

C

250

D

925

✓ Correct! Well done.

✗ Incorrect. Try again or view the solution.

Solution

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