Case study·Hard exam skill (4/5)·No calculatorNeeds mentor review
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 delivery office records five delivery times in minutes:
Total: 4 marks
(a) Find the range of the delivery times. (1 mark)
(b) Find the mean delivery time. (1 mark)
(c) Find the mean deviation about the mean and interpret it briefly. (2 marks)
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