Question

Construct histogram, frequency polygon and frequency curve from the following data:

Marks Obtained	0−10	10−20	20−30	30−40	40−50	50−60	60−70	70−80
Number of Students	10	16	20	20	22	15	8	5

Answer 1

For drawing a frequency polygon, we simply join the top mid-points of the rectangles of the histogram drawn above using a straight line.



Similar to a frequency polygon, for drawing a frequency curve we again joint the top mid-points of the rectangles of the histogram drawn in the first part, but with a free hand (rather than a straight line).