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0580/13 May/Jun 2023, Question 7: Stem-and-Leaf Diagrams

Cambridge IGCSE Mathematics 0580 · Paper 13 (Core) · Calculator · 3 marks

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The question, in short

Using a stem-and-leaf diagram of ages for 21 people, find a fraction over 30, the range, and the median.

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

Part (a) · 1 mark

Find the fraction of the 21 people whose age is greater than 30.

  1. 1More than 30: 4 + 6 + 4 = 14 people
  2. 214/21 = 2/3

Answer2/3

Part (b) · 1 mark

Work out the range of the ages.

  1. 1Range = 57 − 16 = 41

Answer41

Part (c) · 1 mark

Find the median age.

  1. 121 people, so median is the (21 + 1) ÷ 2 = 11th value
  2. 216, 19, 21, 24, 24, 25, 28, 32, 36, 37, 39
  3. 3Median = 39

Answer39

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