A-LevelMathematicsProbability and statisticsOct/Nov 2022Paper 5 Q57 Marks
Eric has three coins. One of the coins is fair. The other two coins are each biased so that the probability of obtaining a head on any throw is 1/4, independently of all other throws. Eric throws all three coins at the same time. Events A and B are defined as follows. A: all three coins show the same result B: at least one of the biased coins shows a head
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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