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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

A

`sqrt2`

B

`2/3`

C

2

D

`sqrt5/2`

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The correct Answer is:
A
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