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0580/13 Oct/Nov 2023, Question 12: Probability from Tables and Charts

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

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The question, in short

A table gives probabilities for how students travel to school, with one probability missing. Complete the table and use the 1800 students to find the expected number who walk.

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

Part (a) · 2 marks

Find the missing probability for the Other category, using that all probabilities in the table sum to 1.

  1. 1Probabilities add to 1
  2. 2Other = 1 − (0.4 + 0.32 + 0.17)
  3. 3= 1 − 0.89 = 0.11

Answer0.11

Part (b) · 1 mark

Using 1800 students and the walk probability 0.32, calculate the expected number of students who walk to school.

  1. 1Expected number = 0.32 × 1800 = 576

Answer576

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Also searched as: 0580/13/O/N/23 · 0580_w23_qp_13 · 0580 w23 13 · question 12.
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