The outcome of each of 30 items was obse...

The outcome of each of 30 items was observed , 10 items gave an outcome `(1)/(2)-d` each, 10 items gave outcome `(1)/(2)` each and the remaining 10 items gave outcome `(1)/(2) +d` each. If the variance of this outcome data is `(4)/(3)`, then |d| equals

`2`

`(sqrt(5))/(2)`

`(2)/(3)`

`sqrt(2)`

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