CBSE Class 6 Maths Chapter 9 Data Handling Notes

In our day to day life, we see various kinds of tables which consist of numbers, figures, names, etc. These tables provide ‘Data’. Data is a collection of numbers gathered to give some information.

Recording Data
Sometimes some information is required very quickly. It is possible only when we adopt some suitable system of collecting data.

Organising Data
If we want to get particular information from the given data quickly, die data can be arranged in a tabular form using tally marks.

Pictograph
A pictograph represents data in the form of pictures, objects or parts of objects. The picture usually helps to understand the data. It helps answer the questions on the data at a glance. Pictographs are often used by dailies and magazines to attract the attention of the readers. However, it requires some practice to understand the information given by a pictograph.

Interpretation of a Pictograph
Simply by observing a pictograph, one can answer the related questions very quickly.

Drawing a Pictograph
We draw pictographs using symbols to represent a certain number of items or things.

A Bar Graph
Representing data by pictograph is tedious and time-consuming. So, a bar graph supplies with another way of representing data visually.
In a bar graph or a bar diagram, bars of uniform width is erected horizontally or vertically with equal spacing between them. The length of the bar gives the required information.

Interpretation of a bar graph
Looking at the bar graph; we can answer the related questions quite easily.

Drawing a Bar graph
First of all, we draw a horizontal line and a vertical line on the horizontal line, we drawbars and on vertical line, we write the numerals. However, we choose a proper scale. For example, 1 unit =100 students. Good practice helps reading a given bar graph a lot.