1.

A data consists of n observations: x_1,x_2,…….x_n ,"If"underset( i=1) overset( n) sum (x_1+ 1)^(2)=9n and underset( i=1) overset( n) sum (x_1-1) ^(2)= 5n ,then the standard deviations of this data is:

Answer»

`5`
`SQRT5`
` SQRT7`
` 2`

Answer :B


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