Types of graphs

There are many types of graphs. Learning to read and create graphs is a very useful skill.



Graphs helps us to visualize data. What we see on the graph may help us to interpret and analyze the data.

The end result is usually a better perspective that may not have been possible just by loking at a bunch of numbers.

In this unit, you will learn about pictographs,bar graphs,double bar graphs,line graphs,and circle graphs.

Let us start with pictographs:

A graph is a visual way to display information.

A pictograph is a graph that uses pictures or symbols to display information.

The pictures in a pictograph usually represent more than one item.

The following is a pictograph:

pictographs

The graph above has a title and a scale. Let say that the circles were drawn by David, Peter, John, Brown, and Jennifer.

The title is "number of circles drawn"

The scale used is the following: one circle represents 5 circles.

David drew 15 circles since we have 3 circles and each circle represents 5 circles.

John drew 7.5 circles. How did we get 7.5?

Note that if a circle represents 5 circles, half a circle will represent 5/2 circles or 2.5 circles.

Add 5 circles to 2.5, give 7.5

Exercise:

Construct a pictograph with the following table:

Number of taxi drivers in 5 cities

Here is the pictographs:

Pictographs for the number of drivers in 5 cities


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          Double bar  graphs                           Making line graphs    

           Circle graphs                                             Scatter plots





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