Complete the table for marks and draw a cumulative frequency curve (ogive).

The table provided in the image is already complete with the frequencies and cumulative frequencies. The missing frequencies for the 30-39 and 50-59 classes were 10 and 20 respectively, which are filled in the image.

Here is the completed table:

To draw the cumulative frequency curve, plot the upper class boundaries (from the "Mark less than" column) against their corresponding cumulative frequencies (from the "Cf" column).
The points to plot are:
$(-0.5, 0)$, $(9.5, 4)$, $(19.5, 11)$, $(29.5, 16)$, $(39.5, 26)$, $(49.