O-LevelMathematicsProbability4024/11 · May/June 2023 · Q123 Marks

Ali keeps a record of the computer games he plays. Out of the first 6 games, Ali wins 4. Out of the first 20 games, Ali wins 13. Use these results to find the best estimate for the probability that Ali will not win the next computer game he plays.

(a)Ali keeps a record of the computer games he plays. Out of the first 6 games, Ali wins 4. Out of the first 20 games, Ali wins 13. Use these results to find the best estimate for the probability that Ali will not win the next computer game he plays.[1]
(b)A spinner is spun n times. The spinner lands on red 14 times. The relative frequency of the spinner landing on red is 0.2 . Find the value of n.[2]

Mark scheme

Marking points from the official mark scheme (May/June 2023). The mark or mark type is shown in brackets.

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Topic: Probability, O-Level Mathematics (syllabus 4024). Structured question, 3 marks.
Source: O-Level Mathematics, May/June 2023 Paper 1 Variant 1, question 12.

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