 |
| Bar Graphs |
|
| This is the simplest type of graphical presentation of data. The following types of bar graphs are possible: |
| |
| (a) Simple bar graph |
| |
| (b) Double bar graph |
| |
| (c) Divided bar graph |
| |
| We will illustrate each of these graphs by the following illustrations: |
| |
|
| |
 |
| |
 |
| |
 |
| |
| 1. All bars have the same thickness. |
| |
| 2. Distance between two consecutive bars is the same. The bars can touch each other. |
| |
| 3. The height of each bar represents the frequency number of students. |
| |
| 4. The thickness has no significance. |
| |
| 5. Bar graphs are preferred when each item of data is separate from the other. |
| |
|
| |
 |
| |
 |
| |
|
| |
 |
| |
 |
| |
| Double bar or divided bar graph is preferred when we want to compare two sets of related data. |
| |
 |
| |
| An officer with a monthly salary of Rs. 7200 plans his budget for a month as given below: |
| |
 |
| |
| Represent this data by a bar graph. |
| |
 |
| |
| This data can be represented by a bar graph as follows: |
| |
 |
| |
| The above data can also be represented by single divided bars as below: |
| |
 |
| |
