Let $X$ be a variate taking values $x_1,x_2,\dots ,x_n$ and $Y$ be a variate taking values $y_1,y_2,\dots ,y_n$ such that $y_i=6x_i+3;i=1,2,\dots ,$n. If  $\mathrm{Var}\left(Y\right)=30,$ ${\sigma }_X=$

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