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[" 64.A data consists of "n" observations "x_(1),x_(2),...,x_(n)." If "sum_(i=1)^(n)(x_(i)+1)^(2)],[=9n" and "sum_(i=1)^(n)(x_(i)-1)^(2)=5n," then the standard deviation of "],[" this data is "],[[" (1) "5," (2) "sqrt(5)," (3) "sqrt(7)," (4) "2]]

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