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$\begin{array} { c c } \hline \text { Height (in.) } & \text { Frequency } \\\hline 68 - 71 & 2 \\72 - 75 & 2 \\76 - 79 & 2 \\80 - 83 & 2 \\84 - 87 & 1 \\\hline\end{array}$

Considering the data to be a population, approximate the variance of the heights.

A)27.7

B)5.6

C)5.3

D)31.1

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