The Following Table Presents the Heights (In Inches) of a Sample

Multiple Choice

The following table presents the heights (in inches) of a sample of college basketball play
$\begin{array}{cc}\hline \text { Height (in.) } & \text { Frequency } \\\hline 68-71 & 3 \\72-75 & 5 \\76-79 & 2 \\80-83 & 2 \\84-87 & 2 \\\hline\end{array}$
Considering the data to be a population, approximate the variance of the heights. .

A) 5.6
B) 31.0
C) 28.8
D) 5.4