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The mean and standard deviation of 10 ob...

The mean and standard deviation of 10 observations `x_(1), x_(2), x_(3)…….x_(10)` are `barx` and `sigma`respectively. Let 10 is added to `x_(1),x_(2)…..x_(9) and 90` is substracted from `x_(10)`. If still, the standard deviation is the same, then `x_(10)-barx` is equal to

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