A scientist wants to estimate the population of beetles in a field. They capture 120 beetles, mark them with a small dot of paint and release them. The next day, they capture a second sample of 100 beetles and find 30 are marked.
Work out an estimate for the population of beetles in the field.
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.
