Toby wants to estimate the number of fish in a large pond. He catches a sample of 40 fish, marks them and releases them back into the pond. A week later, he catches a second sample of 50 fish and finds that 8 of these fish are marked.
Work out an estimate for the number of fish in the pond.
Write down any assumptions you have made.
Practise Edexcel GCSE Maths Capture Recapture with exam-style questions for Foundation and Higher tier. 20 questions, matched to the Edexcel GCSE Maths (1MA1) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.