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