The abscissa of the point of intersection of a grouped data's less than type and more than type cumulative frequency curves gives its:

The free hand graph is the ogive.

The median of the data is given by the abscissa (X-coordinate) of the intersection of the less than ogive and more than ogive. 

When 'less than orgive' and'more than orgive' intersect, the median is the central tendency.

In the above graph, the intersection point is (15,40). The $\mathrm{X}$-coordinate 15 is the median.