Question

Draw a histogram and a frequency polygon for the following data:

Marks	0 - 20	20 - 40	40 - 60	60 - 80	80 - 100
No. of  students	12	18	30	25	15

Answer 1

We represent the class limits on the x-axis on a suitable scale and the frequencies on the y-axis on a suitable scale. Takin class intervals as bases and the corresponding frequencies as heights, we construct rectangles to obtain a histogram of the given frequency distribution.

Now, we take the mid-points of the upper horizontal side of each rectangle. Join the mid-points of two imaginary class intervals, one on either side of the histogram, by line segments one after the other.