Question

The following table gives the route length (in thousand kilometres) of the Indian Railways in some of the years:

Year	1960-61	1970-71	1980-81	1990-91	2000-2001
Route length (in thousand kilometres)	56	60	61	74	98

Represent the above data with the help of a bar graph.

Answer 1

Let's draw two mutually perpendicular lines OX and OY.
Along the horizontal line OX, let's mark years; and along the vertical line OY, let's mark the route length.
Along the axis OX, let's choose a suitable width for each bar, the gap between the bars being the same.
We will now choose a suitable scale to determine the heights of the bars.
Here, let's take 1 big division = 10 thousand kilometres
Therefore, heights of the various bar are as follows:
Height of the bar against 1960 - 61 $=\frac{56}{10}=5.6$ units.
Height of the bar against 1970 - 71​ $=\frac{60}{10}=6.0$ units.
Height of the bar against 1980 - 81 $=\frac{61}{10}=6.1$ units.
Height of the bar against 1990 - 91 $=\frac{74}{10}=7.4$ units.
Height of the bar against 2000 - 2001 $=\frac{98}{10}=9.8$ units.
Based on the above calculation, the bar graph is as follows: