0580/22 Feb/Mar 2025, Question 8: Probability from Tables and Charts
Cambridge IGCSE Mathematics 0580 · Paper 22 (Extended) · Non-calculator · 3 marks
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The question, in short
A game has three outcomes with a partly filled probability table; find the missing probability and the expected number of wins over 120 games.
Summarised in our own words. Use the official paper for the exact wording and the diagram.
Part (a) · 2 marks
Work out the probability of a draw, given that winning has probability 0.3 and losing 0.25.
- 1P(draw) = 1 − (0.3 + 0.25)
- 2= 1 − 0.55 = 0.45
Answer0.45
Part (b) · 1 mark
Using 120 games played, calculate how many wins would be expected.
- 1Expected wins = 0.3 × 120 = 36
Answer36
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