4MA1/2F Jan 2022, Question 21: Basic Probability
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 2F (Foundation) · Calculator · 5 marks
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The question, in short
Using a table of probabilities for green 0.2 and red 0.35, a pink-to-white ratio of 2:1 and 28 red sweets, find how many white sweets the bag holds.
Summarised in our own words. Use the official paper for the exact wording and any diagrams.
Solution · 5 marks
- 1Total sweets = 28 ÷ 0.35 = 80
- 2P(pink or white) = 1 − (0.2 + 0.35) = 0.45
- 3Pink : white = 2 : 1, so P(white) = 0.45 ÷ 3 = 0.15
- 4White sweets = 80 × 0.15 = 12
Answer12
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