4024/12 May/Jun 2024, Question 13: 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 20-day frequency table of daily call counts, work out a relative frequency and scale a grouped count to 160 working days.
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Part (a) · 1 mark
Work out the relative frequency for the 0 to 5 calls group.
- 1Relative frequency = 9/20
Answer9/20
Part (b) · 2 marks
Using the table's proportions, work out how many of 160 days would fall in the 11 or more calls groups.
- 111 or more calls: 4 + 2 = 6 days out of 20
- 26/20 × 160 = 48
Answer48
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