The mean deviation about the mean for the data
\begin{tabular}{|l|l|l|l|l|l|l|}
\hline $\mathrm{x}_{\mathrm{i}}$ & 5 & 7 & 9 & 10 & 12 & 15 \\
\hline $\mathrm{f}_{\mathrm{i}}$ & 8 & 6 & 2 & 2 & 2 & 6 \\
\hline
\end{tabular}
is equal to:
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