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Maths
Summary
Bar charts help you to visualise data at a glance. They make information involving 'how many' easy to compare and understand.
Frequency | How many of something. |
scale | The amount that the frequency axis goes up in. |
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.
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!
You can draw a bar chart from a table to present the data in a more visual way.
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. |
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. |
FAQs
Question: How do I draw a bar chart?
Answer: 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.
Question: What are bar charts?
Answer: Bar charts help you to visualise data at a glance. They make information involving 'how many' easy to compare and understand.
Theory
Exercises
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