AQA · Mathematics · 8300
GCSE Maths: Tables: two-way tables
Statistics · AQA GCSE Maths (8300). Cards are generated from the Corbettmaths textbook exercise and practice questions for Tables: two-way tables (Corbettmaths Video 319), 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 two-way table used for?
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A two-way table organizes data by two different categories, showing how the categories relate to each other.
In a two-way table, what do rows and columns typically represent?
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Rows and columns represent different categorical variables (e.g., gender vs. preference, year group vs. day of week).
When completing a two-way table, how do you find a row or column total?
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Add all the values in that row or column.
In a completed two-way table, what should the sum of all row totals equal?
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The sum of all row totals should equal the sum of all column totals (the grand total).
How do you calculate the probability of an event from a two-way table?
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Divide the frequency of the desired outcome by the total number of outcomes.
What is conditional probability in the context of a two-way table?
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The probability of an event given that another event has already occurred. For example, the probability of red given circular, found by dividing the count in that specific cell by the relevant row or column total.
When solving two-way table problems with totals, what is the key strategy for finding missing values?
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Use the relationship that row totals and column totals must sum correctly. Fill in known values, then use subtraction to find unknown cells.
In a two-way table with multiple categories (e.g., destination × month), what must you track to solve for missing values?
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Track both the row totals and column totals, ensuring all given constraints are satisfied simultaneously.
If a survey includes 40% more Year 9 students than the 20 Year 7 students surveyed, how many Year 9 students were surveyed?
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20 × 1.4 = 28 Year 9 students.
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