AQA · Mathematics · 8300
GCSE Maths: Graphs composite bar charts
Statistics · AQA GCSE Maths (8300). Cards are generated from the Corbettmaths practice questions for Graphs composite bar charts (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 is a composite bar chart?
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A bar chart that divides each bar into sections to show different categories or subcategories of data, stacked within the same bar.
In a composite bar chart, how do you find the value of a specific category within a bar?
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Find the height of that section by subtracting the lower boundary value from the upper boundary value of that section.
When comparing values across different bars in a composite bar chart, what must you check carefully?
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You must compare the heights of the specific sections (not just visual appearance), by reading the scale values at the boundaries of those sections.
If two bars in a composite bar chart have the same total height, what does this indicate?
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The sum of all categories for those two bars is equal, even if the individual category values differ.
To find what fraction of all visitors chose a specific activity from a composite bar chart showing multiple days, what calculation is needed?
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Divide the total for that activity (across all days) by the grand total of all activities across all days.
To find which group had the greatest percentage for a category in a composite bar chart, what must you calculate for each group?
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For each group, divide the value of that category by the total for that group, then multiply by 100 to get the percentage.
When a composite bar chart shows data for multiple years and you need to find a total for one category across all years, what is the process?
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Read the value of that category from each year's bar, then add all those values together.
To find the ratio of one category between two bars in a composite bar chart, what steps are needed?
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1) Read the value of that category from each bar, 2) write as a ratio (first value : second value), then 3) simplify to lowest terms.
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