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If sum(i=1)^n(xi+1)^2=9n and sum(i=1)^n(...

If `sum_(i=1)^n(x_i+1)^2=9n` and `sum_(i=1)^n(x_i-1)^2=5n`, then standard deviation of these 'n' observations `(x_1)` is: (1) `2sqrt(3)` (2) `sqrt(3)` (3) `sqrt(5)` (4) `3sqrt(2)`

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