## CBSE Class 7 Maths Chapter 3 Data Handling Revision Notes

If you are looking forward to scoring excellent marks in your Class 7 Maths Exams then it becomes very significant to understand the importance of Revision. Revision is very important as it helps you remember all the important chapters and co-related concepts that you have learned earlier and for the purpose of Revision, Revision Notes are always considered the best as they make your learning easy and convenient.

Chapter 3 of CBSE Class 7 Maths is Data Handling. Swiflearn offers the best and most reliable CBSE Class 7 Maths Chapter 3 Data Handling Revision Notes that will make students understand all the important topics & concepts of this chapter and will help them in higher studies also. Free CBSE Class 7 Maths Chapter 3 Data Handling Revision Notes provided here are prepared under the auspices of our Excellent Teachers keeping in mind the latest CBSE guidelines.

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**Introduction**

Data can be defined as the collection of numbers gathered to give some information.

**Data Handling**

Collecting, organizing and representing data in a manner so that we can draw inference from it. This is called Data handling.

**Data Collection**

Collection of data should be done keeping in mind the requirement of the data.

**Organizing or Prioritizing Data**

Data can be prioritized or organized in a particular order according to importance.

*For example:* Following are the names of students in a class: Rahul, Kuma, Sohan, Ashok. Prioritize the data according to alphabetic order.

On prioritizing the data, the new order of names become Ashok, Kumar, Rahul, Sohan

**Note**

Another way to organize data is by using tally marks. Tally marks are a way of expressing numbers in groups of sequence

**Representing data**

**Bar diagrams**

Bar diagram is the graphical representation of data using bars of uniform width drawn vertically or horizontally with different lengths.

Bar diagrams consist of two axes: X-axis and Y-axis.

**Note **

A bar diagram is also termed as bar chart. It is used to represent data visually with the help of bars which are of different heights or lengths. The data is graphed either horizontally or vertically so as to make it easy for the viewers to compare different values and therefore draw conclusions quickly and efficiently.

**Scaling Factor**

The large numbers cannot be represented in a bar graph, so the scaling factor is used to reduce or scale down large numbers.

**Pictographs**

The pictograph is a pictorial representation of data.

Here data is represented using images of the objects.

**Double bar graph**

It is similar to that of bar graph except here we use two bars joined to each other to represent two data on the same graph.

### CBSE Class 7 Maths Chapter 3 Data Handling Revision Notes PDF