The document Chapter Notes - Data Handling Class 6 Notes | EduRev is a part of the Class 6 Course Mathematics (Maths) Class 6.

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**Data**is a**collection of numbers**gathered to get some information.- To get the required information, all observations should be recorded.

**Tally marks**are used to**organise the observations**. Record every observation by a vertical mark, but**every fifth observation**should be recorded by a mark across the four earlier marks, like this: .- We depict each observation with the help of tally marks.
**For example**, we have a group of persons and their sizes of shoes.

The tabular form representing the tally marks is as shown here.

**Pictograph:**

- A picture that visually helps us to understand data is called a
**pictograph.** - A pictograph represents data in the form of
**pictures, objects or parts of objects.**

**Examples:**

- In real life, pictographs are used by newspapers and magazines to attract the attention of the readers. A pictograph helps us to answer questions on the data at a glance. To draw pictographs, we use
**symbols to represent**a certain number of things or items. - For example, represents 100 bulbs.
- The key for a pictograph tells the number that each picture or
**symbol represents.**

**Bar Graph:**

**Bar graphs or bar diagrams**are helpful in representing the**data visually**.- In bar graphs or bar diagrams, bars of
**equal width**are drawn horizontally or vertically with equal spacing between them. - The length of each bar represents the required information. Choosing an
**appropriate scale**for a bar graph is important. **Scale**means the number used to represent**one unit length of a bar.**

For example, the scale for the bar graph shown here is 1 unit length = 100 children.

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