Case study·Standard multi-step (3/5)·No calculator
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Question
A spinner is spun times and the results are shown in the figure.
Total: 4 marks
(a) Find the empirical probability of Blue. (1 mark)
(b) Find the empirical probability of not Blue. (1 mark)
(c) Can these trials alone prove that the spinner is unfair? Give a reason. (2 marks)
Something wrong with this item?