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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

`2`

B

`sqrt2 `

C

` (sqrt5)/(2)`

D

` (2)/(3) `

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The correct Answer is:
B
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