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**9. Data Handling**

**Data handling:**

**Data **is a** collection of numbers** gathered to get some information.

**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.

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**Pictograph**

A picture that visually helps us to understand data is called a **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. Eg:**

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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**

A picture that visually helps us to understand data is called a **pictograph.**

**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.

222 videos|105 docs|43 tests

### NCERT Textbook - Data Handling

- Doc | 21 pages
### Test: Data Handling - 3

- Test | 20 ques | 20 min
### How to Organize Data?

- Video | 04:33 min
### Organizing Data using Tally Marks

- Video | 03:34 min
### Understanding Pictograph

- Video | 01:35 min
### What is a Bar Graph? How to draw it?

- Video | 02:18 min

- Test: Data Handling - 2
- Test | 20 ques | 20 min
- NCERT Solutions(Part - 2) - Data Handling
- Doc | 1 pages