O-LevelMathematicsProbability4024/12 · May/June 2022 · Q224 Marks
A bag contains these 9 letter tiles. I S O S C E L E S
- (a)Nur takes one tile from the bag at random. She notes the letter and then puts the tile back in the bag. Find the probability that she does not take a letter E.[1]
- (b)Nur now takes two of the 9 letter tiles at random without replacement. Find the probability that both tiles show the same letter.[3]
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Mark scheme
Marking points from the official mark scheme (May/June 2022). The mark or mark type is shown in brackets.
- [1] (a) 7/9 oe
- [3] (b) 1/8 or 9/72 oe nfww M2 for (3/9 * 2/8) + (2/9 * 1/8) oe or M1 for (3/9 * 2/8) or (2/9 * 1/8) seen If 0 scored, SC1 for answer 13/81 or 8/81
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