Mean Deviation from Median for Continuous Series

Q.

The size of land holdings of 380 families in a village is given below. Find the median size of land holdings.

$\begin{array}{cccccc}\text{Size of Land Holdings in(acres)}& \text{Less than 100}& 100-200& 200-300& 300-400& 400\text{and above}\\ \text{Number of Families}& 40& 89& 148& 64& 39\end{array}$