$\begin{align}  & mean=\overline{x}=\frac{2+6+8+6+2+6}{6}=\frac{30}{6}=5 \\ & variance={{\sigma }^{2}} \\ & {{\sigma }^{2}}=\frac{{{\left| 2-5 \right|}^{2}}+{{\left| 6-5 \right|}^{2}}+{{\left| 8-5 \right|}^{2}}+{{\left| 6-5 \right|}^{2}}+{{\left| 2-5 \right|}^{2}}+{{\left| 6-5 \right|}^{2}}}{6} \\ & {{\sigma }^{2}}=\frac{9+1+9+1+9+1}{6}=\frac{30}{6}=5 \\\end{align}$