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4MA1/1HR Jun 2025, Question 4: Probability from Tables and Charts

Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 1HR (Higher) · Calculator · 5 marks

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The question, in short

Use a biased 5-colour spinner with given probabilities, including 4x and x, to find a combined probability and estimate how often red occurs in 350 spins.

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

Part (a) · 1 mark

Find the probability the spinner lands on blue, green or purple using the table values.

  1. 10.12 + 0.20 + 0.38
  2. 2= 0.7

Answer0.7

Part (b) · 4 marks

First find x from the probabilities summing to 1, then estimate the number of red results in 350 spins.

  1. 11 − 0.7 = 0.3
  2. 24x + x = 0.3 so x = 0.06
  3. 3P(red) = 4x = 0.24
  4. 40.24 × 350 = 84

Answer84

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