Bhavna has a bag containing a large number of beads. She wants to find an estimate for the number of beads in the bag.
Bhavna takes a sample of 30 beads from the bag. She marks each bead with a black cross. She then puts the beads back in the bag.
Bhavna shakes the bag. She now takes another sample of 30 beads from the bag.
4 of these beads have been marked with a black cross.
Work out an estimate for the total number of beads in the bag.
Write down any assumptions you have made.
Practise AQA GCSE Statistics Capture Recapture with exam-style questions for Foundation and Higher tier. 5 questions, matched to the AQA GCSE Statistics (8382) specification and written in Paper 1 and Paper 2 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.