1.

The sum of 100 observations andthe 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 remainingobservations is

Answer»

`8 . 00`
`8 . 25`
`9 . 00`
`8 . 50`

Answer :C


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