4024/12 Oct/Nov 2022, Question 11: Basic Probability
Cambridge O Level Mathematics 4024 · Paper 12 (Non-calculator) · Non-calculator · 3 marks
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The question, in short
From a table of relative frequencies for a four-colour spinner, find the missing green value and the expected number of blue results in 150 spins.
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Part (a) · 2 marks
Use the fact that all relative frequencies total 1 to find the missing relative frequency for green.
- 1Relative frequencies add to 1
- 2Green = 1 − (0.15 + 0.3 + 0.2) = 1 − 0.65
- 3= 0.35
Answer0.35
Part (b) · 1 mark
Using the blue relative frequency 0.3, calculate the expected number of blue outcomes in 150 spins.
- 1Expected number = 0.3 × 150 = 45
Answer45
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