Case study·Hard exam skill (4/5)·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 stationery shop records the number of notebooks sold per day for days: -, -, -, -, -.
Total: 7 marks
(a) Find the modal class and explain what it means here. (2 marks)
(b) Find the approximate mode. (3 marks)
(c) Find the mean number of notebooks sold per day. (2 marks)
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