# Bar Charts

## In a nutshell

Bar charts help you to visualise data at a glance. They make information involving 'how many' easy to compare and understand.

### Definitions

#### Frequency
| How many of something. |

#### scale | The amount that the frequency axis goes up in. |

## Interpreting bar charts

A bar chart has two labelled axes: one for frequency and one for categories. The height of each bar represents the frequency of items in that category.

##### Example 1

**Bar chart to show students' favourite animals**

**Note: **The scale of a bar chart could be anything from ones to twos to hundreds to thousands!

## Presenting data using bar charts

You can draw a bar chart from a table to present the data in a more visual way.

### Drawing bar charts

#### procedure

1. | Draw and label the axes: one for frequency and one for the categories. |

2. | Pick an appropriate scale for the frequency. |

3. | Draw the bars so that their height represents the right frequency. |

##### Example 2

*Here the bar chart has been drawn from the tally chart shown below.*

$\begin{array}{c|c|c}\text{Day}&\text{Tally}&\text{Total} \\\hline\text{Monday} & || & 2 \\ \hline\text{Tuesday} & \cancel{||||} & 5 \\\hline\text{Wednesday} & |||| & 4 \\\hline\text{Thursday} & & 0 \\\hline\text{Friday} & ||| & 3 \end{array}$
| ** Bar chart to show carrots eaten by a rabbit on each day of the week. ** |