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4MA1/2F Jun 2018, Question 2: Basic Probability

Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 2F (Foundation) · Calculator · 3 marks

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The question, in short

Using a table of red-sweet probabilities for bags A to E, identify bags matching three descriptions about likelihood of picking red.

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

Part (a) · 1 mark

State which bag gives the lowest probability of picking a red sweet.

  1. 1Compare the probabilities of picking a red sweet from each bag: 0.7, 0.9, 0.5, 1, 0.2
  2. 2The smallest probability is 0.2
  3. 3Bag E has probability 0.2

AnswerE

Part (b) · 1 mark

State which bag must contain only red sweets.

  1. 1A probability of 1 means the event is certain
  2. 2Bag D has probability 1 for picking a red sweet
  3. 3So bag D contains only red sweets

AnswerD

Part (c) · 1 mark

State which bag has equal chance of red and non-red sweets.

  1. 1A probability of 0.5 means equally likely to pick red or another colour
  2. 2Bag C has probability 0.5
  3. 3So from bag C, Daniel is equally likely to pick a red sweet as a sweet of another colour

AnswerC

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