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4MA1/1F Jun 2024, Question 3: Basic Probability

Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 1F (Foundation) · Calculator · 3 marks

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The question, in short

A box holds 10 balls: 5 black, 3 green, 2 red. Rema picks one at random. Mark probabilities on scales and judge Johan's table of white-counter probabilities for bags A, B, C.

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

Part (a) · 1 mark

Mark on the probability scale, using a cross, the chance that the ball Rema takes is black.

  1. 15 black balls out of 10 total balls
  2. 25 / 10 = 1/2
  3. 3Mark cross at 1/2 on probability scale

Answer1/2

Part (b) · 1 mark

Mark on the probability scale, using a cross, the chance that the ball Rema takes is orange.

  1. 10 orange balls out of 10 total balls
  2. 20 / 10 = 0
  3. 3Mark cross at 0 on probability scale

Answer0

Part (c) · 1 mark

Explain why the probability Johan wrote for bag C, 1.2, cannot be correct.

  1. 1The probability for bag C is 1.2
  2. 2Probabilities must be between 0 and 1 inclusive
  3. 31.2 is greater than 1
  4. 4So it is impossible and therefore incorrect

AnswerProbability cannot be more than 1

Stuck on a step? Read the free lesson: Basic Probability

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