**What is a bar chart?**

Bar charts are a method of displaying data where the height of the bar tells you how much each category is worth.

**The significant points on a bar graph.**

There are four things that a examiner will look for when a bar graph is drawn:

1) The width of each bar must be the same.

2) There must be a gap between each bar and it must be the same size gap each time.

3) With the scales - **frequency **(how often something occurs) must go **up **the side, and the other category along the bottom. The categories for the bottom scale must be written under the middle of each bar.

4) Each axis must have a label.

**Example: **

**The scores for a class in a maths test are shown below:**

**How many pupils are in the class?**

All we have to do for this one is work out what each bar on the chart is worth. This is given by reading off the **height** on the side.

**2 + 3 + 5 + 8 + 6 = 24**

Let's move on to some questions now.