Without Doing Any Computations, Which of the Following Distributions Has

Essay

Without doing any computations, which of the following distributions has the largest variance?
$\begin{array}{llclll}\hline X & f & Y & f & Z & f \\\hline 64 & 1 & 50 & 2 & 80 & 3 \\66 & 1 & 60 & 2 & 81 & 2 \\69 & 5 & 75 & 2 & 82 & 2 \\74 & 2 & 80 & 2 & 83 & 2 \\76 & 1 & 85 & 6 & 84 & 2 \\78 & 4 & 90 & 2 & 85 & 4 \\79 & 1 & 95 & 2 & 86 & 2 \\80 & 5 & 100 & 2 & 87 & 3 \\\hline\end{array}$