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The mean and variance of 5 observation ...

The mean and variance of `5` observation of an experiment are `4` and `5.2` respectively.If these observation are `1`,`2` ,`6`,`x_(1)` and `x_(2)` ,then value of `x_(1)x_(2)` equals
(A) `28` (B) `35` (C) `40` (D) `20`

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