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0580/12 May/Jun 2026, Question 9: Stem-and-Leaf Diagrams

Cambridge IGCSE Mathematics 0580 · Paper 12 (Core) · Non-calculator · 3 marks

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The question, in short

Using a stem-and-leaf display of lunch-eating times for 20 students, work out counts, a percentage and a time difference from the data.

Summarised in our own words. Use the official paper for the exact wording and any diagrams.

Part (a) · 1 mark

Count how many students have times from 10 up to 30 minutes.

  1. 1Stem 1: 5 students, stem 2: 8 students
  2. 25 + 8 = 13

Answer13

Part (b) · 1 mark

Find the percentage of students whose times are under 18 minutes.

  1. 1Less than 18: 7, 8, 9, 11, 13, 15, 16 = 7 students
  2. 27/20 = 35/100 = 35%

Answer35

Part (c) · 1 mark

Calculate how many minutes more the slowest student took than the fastest.

  1. 1Slowest 39, quickest 7
  2. 239 − 7 = 32

Answer32

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