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0580/33 May/Jun 2025, Question 12: Bar Charts and Composite Bar Charts

Cambridge IGCSE Mathematics 0580 · Paper 33 (Core) · Calculator · 5 marks

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The question, in short

Using a dual bar chart of daily customers over two weeks, complete the missing week 1 bar given a total of 200, then find week 2's mode and mean.

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

Part (a) · 2 marks

Week 1 totals 200 customers; use the other four week 1 bars to work out the Saturday value and draw it.

  1. 1Week 1 so far: 20 + 30 + 50 + 60 = 160
  2. 2Saturday = 200 − 160 = 40
  3. 3Draw the shaded Week 1 bar for Saturday to height 40

AnswerBar drawn in correct position with height 40

Part (b) · 1 mark

State the most frequent number of customers among the five week 2 days.

  1. 1Week 2: 30, 40, 40, 70, 60
  2. 240 appears twice, so mode = 40

Answer40

Part (c) · 2 marks

Calculate the mean number of customers across the five days of week 2.

  1. 1Total = 30 + 40 + 40 + 70 + 60 = 240
  2. 2Mean = 240 ÷ 5 = 48

Answer48

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