4MA1/2F Jan 2020, Question 22: Basic Probability
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 2F (Foundation) · Calculator · 4 marks
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The question, in short
From a bag with four colours, blue has probability 0.24 and yellow 0.31; green is twice red. Find the estimated count of red beads in 180 draws with replacement.
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Solution · 4 marks
- 1P(red) + P(green) = 1 − (0.24 + 0.31) = 0.45
- 2Green is twice red, so red is 1 part of 3: 0.45 ÷ 3 = 0.15
- 3Expected reds = 0.15 × 180 = 27
Answer27
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