The Sales Manager Recently Collected a Dataset Containing the Number

Short Answer

The sales manager recently collected a dataset containing the number of days that it took each employees to make his/her first sale after being hired. This dataset appears below. Use it to respond to Questions . For all problems, show work.
$\begin{array}{|l|}\hline \text { Days } \\\hline 26 \\\hline 23 \\\hline 34 \\\hline 21 \\\hline 31 \\\hline 31 \\\hline 33 \\\hline 27 \\\hline 25 \\\hline 13 \\\hline\end{array}$
-Calculate the variance of this sample.