# What is the variance of {-5, 9, 7, 4, -15, 7, 18, -2}?

Mean: $2.875$
Variance: $\frac{{\left(- 5 - 2.875\right)}^{2} + {\left(9 - 2.875\right)}^{2} + {\left(7 - 2.875\right)}^{2} + {\left(4 - 2.875\right)}^{2} + {\left(- 15 - 2.875\right)}^{2} + {\left(7 - 2.875\right)}^{2} + {\left(18 - 2.875\right)}^{2} + {\left(- 2 - 2.875\right)}^{2}}{8} \approx 88.36$