AQA · Mathematics · 8300
GCSE Maths: Graphs: histograms harder
Statistics · AQA GCSE Maths (8300). Cards are generated from the Corbettmaths practice questions for Graphs: histograms harder (Corbettmaths Video 159), 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 the formula for frequency density in a histogram?
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Frequency density = Frequency ÷ Class width
How do you calculate frequency from a histogram bar?
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Frequency = Frequency density × Class width (the area of the bar)
When estimating values within a single class interval on a histogram, what assumption do you make about the distribution?
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The data is evenly distributed (uniform) within that class interval
To find the median from a histogram, what fraction of the total frequency must you locate?
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50% (or 1/2) of the total frequency
What percentage of data lies at or below the lower quartile?
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25% (or 1/4)
What percentage of data lies at or below the upper quartile?
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75% (or 3/4)
How do you calculate the interquartile range from quartile values?
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Interquartile range = Upper quartile - Lower quartile
To estimate the mean from a histogram, what value do you use to represent each class interval?
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The midpoint of each class interval
When a histogram question provides partial information (e.g., '24 cars travelled faster than 40mph'), what must you do first to answer other questions?
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Use the given information to work out the scale or frequency density of the histogram
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