Two machines produce rods with a target length of 80 mm.
| Machine | Mean length (mm) | Standard deviation (mm) |
|---|---|---|
| A | 80.1 | 0.42 |
| B | 79.6 | 0.18 |
State which machine is more accurate relative to the target.
State which machine is more consistent.
Explain why these need not be the same machine.
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.