The number of telephone calls received at an exchange in 245 successive one-minute intervals are...

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The number of telephone calls received at an exchange in 245 successive one-minute intervals are shown in the following frequency distribution:
\begin{tabular}{|l|c|c|c|c|c|c|c|c|}
\hline Number of calls & 0 & 1 & 2 & 3 & 4 & 5 & 6 & 7 \\
\hline Frequency & 14 & 21 & 25 & 43 & 51 & 40 & 39 & 12 \\
\hline
\end{tabular}
Compute the mean deviation about median.
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