The number of faults found on 14 circuit boards is summarised below. The mean number of faults is 3314\dfrac{33}{14}1433.
| Number of faults, xxx | 1 | 2 | 3 | 4 |
|---|---|---|---|---|
| Frequency, fff | 3 | 5 | 4 | 2 |
Calculate the variance.
Interpret the corresponding standard deviation in context.
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.