The distance (in

The given data is very large. Hence, we will construct a group frequency of class size 5.

Therefore,

The class interval will be 0-5, 5-10, 10-15, 15-20 and so on

The data in the table is represented as:

The classes in the table are not overlapping.
Now we can clearly see that 36 out of 40 engineers live under 20 km distance and rest of the 4 engineers live at a distance of more than 20 km.