Solution:
It is given: set of first 
We now need to find the standard deviation
Provided first
![\[\begin{tabular}{|l|l|l|l|l|l|l|l|l|} \hline $\mathrm{x}_{\mathrm{i}}$ & 1 & 2 & 3 & 4 & 5 & $\ldots$ & $\ldots .$ & $\mathrm{n}$ \\ \hline $\mathrm{x}_{\mathrm{i}}^{2}$ & 1 & 4 & 9 & 16 & 25 & $\ldots .$ & $\ldots .$ & $\mathrm{n}^{2}$ \\ \hline \end{tabular}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-5b3cbaddeaa4226cbe0c3740ec41efa9_l3.png "Rendered by QuickLaTeX.com")
Therefore, sums of these are
And
So, we can write the standard deviation as,
Substitute the values
Simplify
Multiplyi the numerator
Take LCM and simplify
As a result, 
