O-LevelMathematicsProbability4024/13 · May/June 2025 · Q103 Marks
A spinner can land on red, green, yellow or blue. The table shows the probability of each outcome. Colour | Probability Red | 0.35 Green | 0.2 Yellow | 0.15 Blue | 0.4
- (a)One of the values in the table is incorrect. Explain how you know this.[1]
- (b)The probability of the spinner landing on blue is incorrect. Work out the correct probability of the spinner landing on blue.[2]
Mark scheme
Marking points from the official mark scheme (May/June 2025). The mark or mark type is shown in brackets.
- [1] (a) The probabilities add up to more than 1 oe
- [2] (b) 0.3[0]
- M1 for 1 – (0.35 + 0.2 + 0.15) oe or for 0.4 – (1.1 -1)
- or B1 for 0.7
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