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4MA1/1FR Jun 2020, Question 4: Basic Probability

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

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The question, in short

A bag holds 12 beads: 6 green, 4 blue, 2 pink. Peter picks one at random. Describe likelihood of green, then mark probabilities on a 0 to 1 scale for orange, blue, and green or pink.

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

Part (a) · 1 mark

Choose the word from the list that best matches how likely it is that the chosen bead is green.

  1. 16 out of 12 beads are green, so probability is 6/12 = 1/2
  2. 2probability of 1/2 corresponds to 'evens'

Answerevens

Part (b) · 1 mark

Put a cross on the probability scale at the chance the picked bead is orange.

  1. 1There are no orange beads in the bag
  2. 2probability of taking an orange bead is 0
  3. 3mark X at 0 on the probability scale

AnswerCross at 0

Part (c) · 1 mark

Put a cross on the probability scale at the chance the picked bead is blue.

  1. 14 out of 12 beads are blue
  2. 24/12 = 1/3
  3. 31/3 is approximately 0.333, which is the second mark along the scale
  4. 4mark X at the second mark along

AnswerCross at the 2nd mark along

Part (d) · 1 mark

Put a cross on the probability scale at the chance the picked bead is green or pink.

  1. 16 green + 2 pink = 8 beads that are green or pink
  2. 28/12 = 2/3
  3. 32/3 ≈ 0.667, which is the fourth mark along the scale
  4. 4mark X at the fourth mark along

AnswerCross at the 4th mark along

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

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