Approximate the Population Variance Given the Following Frequency Distribution A)9236
B)30

Multiple Choice

Approximate the population variance given the following frequency distribution.
$\begin{array} { c c } \hline \text { Class } & \text { Frequency } \\\hline 0 - 19 & 19 \\20 - 39 & 11 \\40 - 59 & 13 \\60 - 79 & 15 \\80 - 99 & 19 \\\hline\end{array}$

A) 923.6
B) 30.6
C) 935.8
D) 30.4