AQA · Mathematics · 8300
GCSE Maths: Averages: Quartiles
Statistics · AQA GCSE Maths (8300). Cards are generated from the Corbettmaths practice questions for Averages: Quartiles (Corbettmaths Video 57), 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 median of an odd-sized ordered dataset?
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The middle value. For example, in a dataset of 7 values, it is the 4th value.
What is the lower quartile (Q1)?
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The value that separates the lowest 25% of data from the rest; the median of the lower half of the dataset.
What is the upper quartile (Q3)?
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The value that separates the highest 25% of data from the rest; the median of the upper half of the dataset.
How is the interquartile range (IQR) calculated?
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IQR = Upper Quartile (Q3) − Lower Quartile (Q1).
Before finding quartiles, what must be done to a dataset?
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The data must be arranged in order from smallest to largest.
How is the range of a dataset calculated?
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Range = Maximum value − Minimum value.
Why is the interquartile range often more useful than the range?
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The IQR is less affected by outliers or extreme values, giving a better sense of the typical spread.
In a dataset of 15 ordered values, which position is the median?
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The 8th value (the middle value).
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