1.

If sum_(i=1)^(18) (x_(i) - 8) = 9 andsum_(i=1)^(18) (x_(i) - 8)^(2) = 45 then the standard deviation of x_(1), x_(2),…,x_(18) is

Answer»

`(4)/(9)`
`(9)/(4)`
`(3)/(2)`
`(1)/(2)`

Answer :C


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