plumiConditional probability: WJEC A‑Level Maths questions
WJEC A-Level Maths past-paper questions on 3.2 Conditional probability, 2018–2025, with mark schemes and examiner’s reports where available. Add MadAsMaths questions to your practice, or browse them separately by topic and difficulty.
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All 10 questions on Conditional probability, as a list
- Summer 2025, Unit 4, Q2 (12 marks): 2. Selina is sitting two multiple-choice tests. (a) For each question in the first test, she classifies herself as ‘very confident’, ‘confident’ or ‘not confide
- Summer 2025, Unit 4, Q4 (16 marks): 4. Collectable football cards come in packs. The masses, in grams, of the packs are normally distributed with mean 28.3 and standard deviation 0.3. (a) Calculat
- Summer 2024, Unit 4, Q1 (3 marks): 1. The table below shows the destination from school of 180 year 11 pupils. Most pupils either continued education, in school or college, or went into some form
- Summer 2024, Unit 4, Q4 (21 marks): 4. Jake works for a parcel delivery company. The masses, in kilograms, of parcels he delivers are normally distributed with mean 2.2 and standard deviation 0.3.
- Summer 2023, Unit 4, Q2 (7 marks): A certain fungus occurs in a population of trees in two mutually exclusive types, 0 2 X and Y. It is known that 4% of the trees have type X of the fungus and th
- Summer 2022, Unit 4, Q2 (8 marks): 2 System faults that occur in a particular type of aeroplane can be categorised in one of three mutually exclusive ways as compass (event C), gyroscopic (event
- Summer 2019, Unit 4, Q1 (5 marks): 1 Val buys electrical components from one of 3 suppliers A, B, C, in the ratio 2 : 1 : 7. The probability that the component is faulty is 0.33 for A, 0.45 for B
- Summer 2018, Unit 4, Q1 (7 marks): 1 An architect bids for two construction projects. He estimates the probability of winning bid A is 0.6, the probability of winning bid B is 0.5 and the probabi
- Summer 2018, Unit 4, Q2 (7 marks): a) Marie is an athlete who competes in the high jump. In a certain competition she 0 2 is allowed two attempts to clear each height, but if she is successful wi
- Summer 2018, Unit 4, Q3 (10 marks): 3 Antonio arrives at a train station at a random point in time. The trains to his desired destination are scheduled to depart at 12-minute intervals. a) Assume
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