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Out of 30 observation 10 are 1/2+d, 10 a...

Out of 30 observation 10 are `1/2+d, 10` are `1/2` and other `10` are `1/2-d` whose variance is `4/3` then `|d|` is equal to (A) `1` (B) `sqrt2` (C) `sqrt3` (D) `1/sqrt2`

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