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4MA1/2FR Jan 2022, Question 18: Basic Probability

Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 2FR (Foundation) · Calculator · 4 marks

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The question, in short

A tin holds tea bags in four flavours with a partially filled probability table; find the missing Nilgiri probability and the combined probability for two named flavours.

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

Part (a) · 2 marks

Using the table probabilities for Assam, Darjeeling and Rize, work out the probability of picking Nilgiri.

  1. 1The four probabilities add up to 1.
  2. 20.38 + 0.24 + 0.16 = 0.78
  3. 3Nilgiri = 1 − 0.78 = 0.22

Answer0.22

Part (b) · 2 marks

Work out the probability that the chosen tea bag is either Darjeeling or Rize.

  1. 1For Darjeeling or Rize, add their probabilities.
  2. 20.24 + 0.16 = 0.4

Answer0.4

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