AQA · Mathematics · 8300
GCSE Maths: Graphs: bar charts (reading)
Statistics · AQA GCSE Maths (8300). Cards are generated from the Corbettmaths textbook exercise and practice questions for Graphs: bar charts (reading) (Corbettmaths Video 148), and every card links back to the exact page it came from. Practice tests are drawn from this deck’s own cards. Source material © Corbettmaths — used with attribution.
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What does a bar chart display?
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A bar chart displays categorical data using rectangular bars, where the height (or length) of each bar represents the frequency or value of each category.
On a bar chart, what does the height of each bar represent?
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The frequency or count of items in that category.
What is a dual bar chart used to display?
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A dual bar chart displays two related sets of data side-by-side, allowing comparison between two groups (e.g., boys and girls in different tutor groups).
What is the modal value in a bar chart?
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The modal value is the category with the highest frequency—the tallest bar on the chart.
How do you find the total number of items represented in a bar chart?
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Add up the frequencies (heights) of all the bars.
How do you calculate the range from data shown in a bar chart?
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Subtract the lowest value (or frequency) from the highest value (or frequency).
To find the mean from a bar chart showing frequencies, multiply each value by its frequency, sum these products, then divide by the ?.
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total frequency
When comparing data from two bar charts, what operation helps you find 'how many more' one category has than another?
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Subtraction. Find the difference between the two frequencies.
When converting bar chart data to a percentage, what calculation do you perform after counting the relevant category?
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Divide the count by the total, then multiply by 100.
When completing a bar chart from partial information, what two sources of information should you use?
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The given data values or constraints (like totals or relationships between categories) and any partially completed bars already shown on the chart.
If you buy an item with a deposit and equal monthly payments, what formula gives the monthly payment amount?
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Monthly payment = (Total price − Deposit) ÷ Number of months.
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