Sian wants to estimate the number of birds in a woodland area. She catches 60 birds, attaches a ring to their leg and releases them. Later, she catches a sample of 45 birds and finds that 15 of them have rings.
Calculate an estimate for the total number of birds in the woodland.
Write down any assumptions you have made.
Practise OCR GCSE Maths Capture Recapture with exam-style questions for Foundation and Higher tier. 20 questions, matched to the OCR GCSE Maths (J560) specification and written in the written papers 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.
