4MA1/1F Jun 2019, Question 19: Probability from Tables and Charts
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 1F (Foundation) · Calculator · 4 marks
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The question, in short
Using a biased 6-sided dice probability table with terms 2x, 0.18, 2x, 3x, 0.26 and x, estimate how many even results occur in 200 throws.
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Solution · 4 marks
- 1Probabilities add to 1: 8x + 0.18 + 0.26 = 1
- 28x = 0.56, so x = 0.07
- 3P(even) = P(2) + P(4) + P(6) = 0.18 + 0.21 + 0.07 = 0.46
- 4Estimate = 0.46 × 200 = 92
Answer92
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