AQA · Mathematics · 8300
GCSE Maths: Graphs: dual bar charts
Statistics · AQA GCSE Maths (8300). Cards are generated from the Corbettmaths practice questions for Graphs: dual 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 dual bar chart?
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A bar chart that displays two sets of data side by side for comparison, typically using different colors or patterns to distinguish between the datasets.
In a dual bar chart comparing two time periods, what does each pair of bars represent?
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Each pair shows the same category or item measured in two different time periods (e.g., last season vs. this season, or 2023 vs. 2024).
When comparing values on a dual bar chart, what calculation finds how many 'less' or 'fewer' one value is than another?
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Subtract the smaller value from the larger value (difference = larger - smaller).
On a dual bar chart, how can you identify when two groups scored or achieved the same result in a particular category?
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The two bars for that category are the same height.
To find the total points scored by one person across multiple challenges on a dual bar chart, what operation do you perform?
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Add up all the values from that person's bars across all categories.
In a basketball match shown on a dual bar chart by quarter, how do you determine which team won and by how many points?
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Sum all quarter scores for each team, then subtract the lower total from the higher total to find the winning margin.
How do you calculate the mean from values shown on a bar chart?
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Add all the values together, then divide by the number of values.
How do you find the median from a set of values shown on a bar chart?
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Arrange the values in order from smallest to largest, then find the middle value (or the average of the two middle values if there's an even number of values).
How do you calculate the range from values shown on a bar chart?
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Subtract the smallest value from the largest value.
If a fair dice is rolled 60 times, how many times would you expect each number (1-6) to appear?
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10 times each (60 ÷ 6 = 10).
When combining data from multiple bar charts into a single category, what operation is used?
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Addition — add together all the values from each source for each category.
What does it mean if a dice is described as 'biased'?
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The dice does not give each outcome an equal probability; some numbers are more or less likely to appear than others.
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