Use a graph paper for this question. The daily pocket expenses of 200 students in a school are given below :

Pocket expenses (in ₹)	No. of students (frequency)
0 - 5	10
5 - 10	14
10 - 15	28
15 - 20	42
20 - 25	50
25 - 30	30
30 - 35	14
35 - 40	12

Draw a histogram representing the above distribution and estimate the mode from the graph.

Steps :

1. Take 1 cm along x-axis = ₹5 and 1 cm along y-axis = 5 students.
2. Construct rectangles corresponding to the given data.
3. In highest rectangle, draw two st. lines AC and BD from corners of the rectangles on either side of the highest rectangle to the opposite corners of the highest rectangle. Let P be the point of intersection of AC and BD.
4. Through P, draw a vertical line to meet the x-axis at M. The abscissa of the point M represents ₹21.50.

Hence, the required mode = ₹21.50.