0580/23 Oct/Nov 2022, Question 6: Probability from Tables and Charts
Cambridge IGCSE Mathematics 0580 · Paper 23 (Extended) · Calculator · 3 marks
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The question, in short
A spinner has outcomes green, black and red with given probabilities for green and black; complete the table and find the expected number of green results in 120 spins.
Summarised in our own words. Use the official paper for the exact wording and any diagrams.
Part (a) · 2 marks
Work out the missing probability for red, using the fact that all probabilities sum to 1.
- 1P(red) = 1 − (2/5 + 1/4)
- 2= 1 − 13/20 = 7/20
Answer7/20 or 0.35 or 35%
Part (b) · 1 mark
Calculate the expected count of green outcomes when the spinner is spun 120 times.
- 1Expected green = 2/5 × 120 = 48
Answer48
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Also searched as: 0580/23/O/N/22 · 0580_w22_qp_23 · 0580 w22 23 · question 6.
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