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In a group of data, there are n observat...

In a group of data, there are n observations, `x,x_(2), ..., x_(n)." If "sum_(i=1)^(n)(x_(i)+1)^(2)=9n and sum_(i=1)^(n)(x_(i)-1)^(2)=5n`,
the standard deviation of the data is

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