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 lab group measures the same liquid sample three times and obtains , and .
Total: 3 marks
(a) Find the mean volume. (1 mark)
(b) Report the mean to the appropriate decimal place for these readings. (1 mark)
(c) State whether the readings are reasonably precise or widely scattered. (1 mark)
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