The lifetimes of batteries from two suppliers are summarised below.
| Supplier | Mean lifetime (hours) | Standard deviation (hours) |
|---|---|---|
| P | 42.6 | 5.8 |
| Q | 40.9 | 2.7 |
Compare the battery lifetimes from the two suppliers.
278 exam-style questions on CCEA A Level Maths 2.5 Data presentation and interpretation, covering 2.5.1 Data presentation and interpretation, 2.5.2 Data presentation and interpretation, 2.5.3 Data presentation and interpretation, 2.5.4 Data presentation and interpretation, 2.5.5 Data presentation and interpretation, 2.5.6 Data presentation and interpretation, 2.5.7 Data presentation and interpretation, 2.5.8 Data presentation and interpretation, 2.5.9 Data presentation and interpretation, and 2.5 Data presentation and interpretation. Each one has a worked solution and a mark scheme showing where the marks go.