The following table shows the marks obtained by the students of a class in an examination.

Marks	No. of students
0 - 10	15
10 - 20	32
20 - 30	55
30 - 40	35
40 - 50	13

Draw a frequency polygon.

Frequency distribution table :

Steps to draw frequency polygon :

1. Take 2 cm along x-axis = 10 marks.

2. Take 2 cm along y-axis = 10 students.

3. Find the mid-point of class intervals.

4. Find points corresponding to given frequencies of classes and the mid-points of class-intervals, and plot them.

5. Join consecutive points by line segments.

6. Join first end point with mid-point of class (-10) - 0 with zero frequency and join the other end with mid-point of class 50 - 60 with zero frequency.

The required frequency polygon is shown below: