Answer
Variance:$37.58$.
Standard deviation:$6.13$
Range:$17.5$.
Work Step by Step
By using the results from before: $\mu=11.05$
Variance=$\frac{\sum (x-\mu)^2}{n}=\frac{(3-11.05)^2+(6.5-11.05)^2+...+(17.5-11.05)^2}{5}=37.58.$
Standard deviation=$\sqrt{variance}=\sqrt{37.58}=6.13$
Range=maximum value-minimum value=$20.5-3=17.5$.
