GCSE Maths
GCSE Maths Capture Recapture Exam Questions
Free GCSE Maths exam questions on Capture Recapture, with full model answers. Covers estimating population size by capture recapture.
Capture Recapture exam questions
1 question pack of real past exam questions with its mark scheme. Answer every question without notes, then mark your answers line by line against the mark scheme.
About GCSE Maths Capture Recapture
Capture Recapture is a Grade 6+ GCSE Maths topic, so it mostly comes up on Higher tier papers. These questions suit AQA GCSE, Edexcel GCSE, OCR GCSE and Eduqas GCSE. Work through the pack without notes, then mark every answer against the model answers and redo any you got wrong a few days later.
What you need to know
- Formula N ≈ (first sample x second sample) ÷ marked in second.
- Assumptions Marks not lost; population constant; mixing.
- Estimates Answers are estimates.
Common mistakes in Capture Recapture
- Using the wrong numbers.
- Ignoring assumptions.
Try two Capture Recapture exam-style questions
1. 50 fish are marked. Later 40 are caught, 8 marked. Estimate the population. (2 marks)
Show the mark scheme answer
250
2. State one assumption. (1 mark)
Show the mark scheme answer
No fish are born or die between samples
Capture Recapture FAQs
Which exam boards include Capture Recapture?
These questions suit AQA GCSE, Edexcel GCSE, OCR GCSE and Eduqas GCSE.
What grade is Capture Recapture in GCSE Maths?
It is a Grade 6+ topic, so it mostly appears on Higher tier papers.
How should I use these Capture Recapture questions?
Answer every question without notes, then check each answer against the model answers and redo the ones you got wrong.
