Let's Go Back to the Distribution We Utilized in Problem

Let's go back to the distribution we utilized in problem 4 (how often students skipped class in the past 12 months). Compute the range, variance, and standard deviation $$\begin{array} { | c | c | } \hline \begin{array} { c } \text { No. } \\\text { skipped }\end{array} & \boldsymbol { f } \\\hline 0 & 3 \\\hline 1 & 8 \\\hline 2 & 1 \\\hline 3 & 0 \\\hline 4 & 3 \\\hline 5 & 0 \\\hline 6 & 4 \\\hline 7 & 2 \\\hline 8 & 0 \\\hline 9 & 0 \\\hline 10 & 2 \\\hline 11 & 1 \\\hline 12 & 1 \\\hline\end{array}$$ .