- A bar graph is a graph that shows complete data with rectangular bars.
- Bar graphs are a pictorial representation of grouped data and it is one of the ways of data handling.

**Properties of Bar graph**

- All rectangular bars should have equal width and should have equal space between them.
- The bars in the graph can be shown vertically or horizontally.
- The height of the bar is proportional to the values they represent.
- The rectangular bars must be on a common base.

**How to Draw a Bar graph?**

Let us see an example of Bar graph.

**Examples:**

The number of students in three different classes of a school is given below. Represent the data on a bar graph.

Classes | Number of Children |
---|---|

Class 1 | 20 |

Class 2 | 15 |

Class 3 | 12 |

**Answer:**

The number of students is represented by the vertical lines and the classes are represented through the horizontal lines. Here is the complete picture of the bar graph.

**Uses of Bar graph**

- The comparisons between different variables are different and easy and convenient.
- It is very easy to prepare a diagram of a bar graph.
- It is a widely used variation of data handling. Therefore, it is used by various industries.
- If the frequency of data is very large then bar graphs are always more useful. As pictographs become time-consuming and very difficult in such cases.

**Interpretation of Bar Graph**

- Understand the data presented on the horizontal line and the vertical line.
- Know the relationship between the horizontal line and the vertical line in terms of the height of the bars.
- Observe the fixed intervals along the vertical lines.

**Examples:**

Here is bar graph drawn on how many students like apple, orange, and mango.

Observe the given bar graph and answer the following questions.

- How many students like apple?
- How many more students like apple than mango?
- What is the total number of students who like orange and mango?
**Answer:**Here along the vertical line number of students are represented and horizontal line fruits are represented.

- 20 students liked apples.
- 20 students like apple and 12 students like mango.
So, 20 – 12 = 8

8 students like apple as fruit than mango.

- From the graph, it is clear that there are 15 oranges and 12 mangoes.
So, the total number of oranges and mangoes are 15 + 12 = 27.

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