Question

Number of mobile phone users in various age groups in a city is listed below:

Age group (in years)	Number of mobile users
1 – 20	25000
21 – 40	40000
41 – 50	35000
61 – 80	10000

Draw a bar graph to represent the above information.

Answer 1

In order to construct a bar graph representing the above data, we follow the following steps:

Step I: Take a graph paper and draw two mutually perpendicular lines OX and OY. Let OX as the horizontal axis and OY as the vertical axis.

Step II: Along OX, mark age groups and along OY, mark number of mobile users.

Step IV: Choose a suitable scale to determine the heights of the bars, according to the availability of space. Here, we choose 1 unit length represents 5000 mobile users.

Step V: Calculate the height of various bars as follows

Age group (in years)	Number of mobile users
(1 – 20) years	`25000/5000` = 5 units
(21 – 40) years	`40000/5000` = 8 units
(41 – 50) years	`35000/5000` = 7 units
(61 – 80) years	`10000/5000` = 2 units

Hence, the required bar graph of given data is shown below

Scale: 1 unit length = 5000 mobile users