A-LevelMathematicsProbability and statisticsOct/Nov 2018Paper 6 Q26 Marks
The following back-to-back stem-and-leaf diagram shows the reaction times in seconds in an experiment involving two groups of people, A and B. A B (4) 4200 | 20 | 567 (3) (5) 98500 | 21 | 122377 (6) (8) 98753222 | 22 | 1356689 (7) (6) 876521 | 23 | 45788999 (8) (3) 863 | 24 | 2456788 (7) (1) 0 | 25 | 0278 (4) Key: 5 | 22 | 6 means a reaction time of 0.225 seconds for A and 0.226 seconds for B The median value for group B is 0.235 seconds, the lower quartile is 0.217 seconds and the upper quartile is 0.245 seconds.
📋 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.
🔒
Unlock the Examiner's Analysis
Sign up for free to reveal the full examiner report, trap analysis, and mark scheme breakdown for this question.
Sign Up Free to Unlock →Join thousands of Cambridge students already using Oracle Prep