During a test, the number of warning lights showing on each of 60 cars was recorded. The results are summarised in the table below.
| Number of warning lights | Frequency |
|---|---|
| 0 | 7 |
| 1 | 14 |
| 2 | 19 |
| 3 | 12 |
| 4 | 8 |
Find the interquartile range of the number of warning lights showing on these 60 cars.
Circle your answer.
1
2
3
21
244 exam-style questions on AQA A Level Maths 2.2 L: Data presentation and interpretation, covering 2.2.1 Single-variable data diagrams, 2.2.2 Scatter diagrams and correlation, 2.2.3 Central tendency, variation and standard deviation, 2.2.4 Outliers and cleaning data, and 2.2 L: Data presentation and interpretation. Each one has a worked solution and a mark scheme showing where the marks go.