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The sum of 100 observations and the sum...

The sum of 100 observations and the sum of their squares are 400 and 2475 , respectively. Later on three observations 3,4 and 5, were found to be incorrect. if the correct observations are omitted. then the variance of the remaining observations is

A

`8 . 00`

B

`8 . 25`

C

`9 . 00`

D

`8 . 50`

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The correct Answer is:
C
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