The times taken, to the nearest minute, by 80 people to complete a task are summarised in the table below.
| Time (minutes) | 5–9 | 10–14 | 15–24 | 25–34 |
|---|---|---|---|---|
| Frequency | 12 | 28 | 30 | 10 |
A histogram is drawn. The bar representing the class 10–14 has a height of 8.4 cm.
Find the height of the bar representing the class 15–24.
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.