MCQ
The inequality representing the following graph is:


- A$\text{|x|}<3$
- ✓$\text{|x|}\leq3$
- C$\text{|x|}>3$
- D$\text{|x|}\geq3$

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${x_1},{x_2},......,{x_n}.$ If $\sum\limits_{i - 1}^n {{{({x_i} + 1)}^2}} = 9n$ and $\sum\limits_{i - 1}^n {{{({x_i} - 1)}^2}} = 5n,$ then the standard deviation of this data is