O-LevelMathematicsProbability4024/23 · May/June 2025 · Q83 Marks
A bag contains 4 black tiles and 6 white tiles. A tile is chosen at random from the bag and is then replaced. A second tile is then chosen at random.
- (a)Complete the tree diagram.[2]
- (b)Work out the probability that both tiles are white.[1]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (May/June 2025). The mark or mark type is shown in brackets.
- [2] Correct tree diagram with 4/10 oe for black and 6/10 oe for white
- M1 for a correct pair
- [1] 36/100 oe
- FT their 6/10 x their 6/10
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