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4MA1/1FR Jan 2021, Question 2: Basic Probability

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

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The question, in short

Use a bag with 7 red, 2 blue and 1 green counter to pick likelihood words, then mark probabilities for rolling a fair six-sided dice on a 0 to 1 scale.

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

Part (ai) · 1 mark

Choose the likelihood word for taking a red counter from the bag.

  1. 1There are 7 red counters out of 10, so the chance is high.
  2. 2The word that best describes this likelihood is likely.

Answerlikely

Part (aii) · 1 mark

Choose the likelihood word for taking a yellow counter from the bag.

  1. 1There are no yellow counters in the bag.
  2. 2The word that best describes this likelihood is impossible.

Answerimpossible

Part (b) · 1 mark

Mark on the probability scale the chance a fair dice lands on an odd number.

  1. 1A fair six-sided dice has three odd numbers: 1, 3, 5.
  2. 2Probability of landing on an odd number is 3/6 = 1/2.
  3. 3Mark a cross at 1/2 on the probability scale.

Answercross at 1/2

Part (c) · 1 mark

Mark on the probability scale the chance a fair dice lands on 2.

  1. 1There is one face with the number 2 on a six-sided dice.
  2. 2Probability of landing on 2 is 1/6.
  3. 3Mark a cross at 1/6 on the probability scale.

Answercross at 1/6

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