Ravina wants to find an estimate for the number of birds in a sanctuary.
She catches a sample of 80 birds in the sanctuary and tags each of these birds.
These birds are then released back into the sanctuary.
The next day she catches a sample of 60 birds in the sanctuary.
Ravina has tagged 15 of these birds.
Write 1560\displaystyle \frac{15}{60}6015 in its simplest form.
Hence, work out an estimate for the number of birds in the sanctuary.
Write down an assumption you have made.
87 exam-style questions on Eduqas GCSE Maths Capture Recapture. Each one has a worked solution and a mark scheme showing where the marks go.