- Bar graph is the graphical representation of the set of data.
- It is rectangular bar of equal width and the height of the bar is proportional to the value of data they represent.
- It has two lines, one horizontal line and one vertical line.
- The horizontal line represents the data type or the data categories.
- The vertical line represents the data value.

The graph below shows a bar graph of the number of food items that were sold in the shop.

**Properties of Bar graphs**

- All the bar must be equally spaced.
- The height of the bar represents the data value.
- The bar graphs must have a title, labels and scales.
- The data value must always start with 0.

**Types of Bar graphs**

- Horizontal bar graph
- Vertical bar graph

**Horizontal Bar Graphs**

- The data are arranged horizontally.
- In this graph the data type is in the vertical line and the data value is in the horizontal line.
- The bar runs from left to right.

**Vertical Bar graphs**

- The data are arranged vertically.
- In this graph the data type is in the horizontal line and the data value is in the vertical line.
- The bar runs from down to up.

**Steps to draw Vertical Bar graphs**

**Interpret the Bar Graphs**

- The title of the bar graph tells us what the data is about.
- The horizontal lines and the vertical lines represent the data type and the data value respectively.
- The horizontal bar graph below shows the graph of the favorite fruits of the group of students.

**From the graph it can be visualized that:**

- The bar representing the mango is the longest bar.

Therefore, most of the students like Mango.

- The representing the orange is the shortest bar. Therefore, the least liked fruit is Orange.
- The scale of the graph is: 1 unit = 5 students.
- 10 students liked Apple.
- 20 students liked Mango.
- 5 students liked Orange.
- 15 students like Banana.

**Example:**

Given below is the data of the number of students with their pets.

Pets | Number of Students |
---|---|

Parrot | 12 |

Dog | 24 |

Rabbit | 10 |

Cats | 25 |

Draw a vertical bar that represents the given information and answer the following question:

- Which pet is kept by the maximum number of students?
- Which pet is kept by least number of students?

**Solution:**

The vertical bar graph is:

- The graph shows that the maximum number of students liked cats.
- The graph shows that the minimum students liked rabbits.

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