7 Jan 2016

PrepHelp Educators

Learning Concepts of Bar Graph Data Interpretation

A Bar Graph (also called Bar Chart) is a graphical display of data using bars of different heights.
It is a really good way to show relative sizes: we can see which types of movie are most liked, and which are least liked, at a glance.

We can use bar graphs to show the relative sizes of many things, such as what type of car people have, how many customers a shop has on different days and so on.

Imagine you just did a survey of your friends to find which kind of movie they liked best:

Table: Favorite Type of Movie

We can show that on a bar graph like this:

Favorite Movies

Example: Nicest Fruit

A survey of 145 people asked them "Which is the nicest fruit?":


And here is the bar graph:

That group of people think Blueberries are the nicest.

Bar Graphs can also be Horizontal, like this:

Example: Student Grades

In a recent test, this many students got these grades:


And here is the bar graph:

Bar Chart Example

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