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GCSE Maths

Probability

Capture Recapture

Capture Recapture

Practice Questions and Resources

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Everything you need to master this topic.

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Workpack

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Solutions

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Level 7–9
Higher
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Key Points 

  • Used to estimate the size of a population.

  • A sample is captured, marked and released.

  • A second sample is captured and the number of marked items is counted.

  • Estimated population = (First sample × Second sample) ÷ Number of recaptured marked items.

  • Assumes the population is closed, markings remain visible, and marked individuals mix randomly before the second sample.


Keywords: capture-recapture, population estimate, sampling, probability, GCSE statistics.

Step-by step tutorial 

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