We will learn how to represent data on a bar graph. We have seen how pictograph represents a pattern of information through numerical data in general. But such representation takes much time and sometimes, drawing picture symbols make it more difficult. So, instead of using picture symbols, it is easier to use bars with equal width (rectangles) to represent the number of buses.
Look at the following bar graph representation.
Such a representation of data with the help of bars is called a bar graph. The bars can be shaded or coloured.
Types of bar graphs
There are two types of bar graphs:
(i) Horizontal bar graph (ii) Vertical bar graph
Horizontal Bar Graph
Let us consider an example:
Draw a horizontal bar graph based on the following data.
The bar graph gives us the following information.
(i) The number of students passed in different subjects.
(ii) The maximum number of students passed in Music.
(iii) The minimum number of students passed in English and Maths.
(iv) The student performed best in Music and worst in English and Maths.
Vertical Bar Graph
Let us take an example.
Draw a vertical bar graph based on the following data.
The graph gives us the following information.
(i) The number of different brand of T. V. Sets manufactured on a certain day.
(ii) The production of Sony TV sets was maximum on that day.
(iii) The production of Prince TV sets was minimum on that day.
We can say that a bar graph is a pictorial representation of the numerical data by a number of bars (rectangles) having the same width drawn horizontally or vertically with equal space between them.