0580/11 Oct/Nov 2022, Question 14: Basic Probability
Cambridge IGCSE Mathematics 0580 · Paper 11 (Core) · Calculator · 3 marks
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The question, in short
Mario tests new cars; each has a 0.04 chance of being faulty. Work out the chance a car is fine, and the expected number faulty among 850 cars tested in a week.
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Part (a) · 1 mark
Work out the chance that a tested car is not faulty, given the 0.04 faulty probability.
- 1P(not faulty) = 1 − 0.04 = 0.96
Answer0.96 or 96% or 24/25
Part (b) · 2 marks
Using 850 cars tested in one week, work out how many are expected to be faulty.
- 1Expected = 0.04 × 850 = 34 cars
Answer34
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