The distance travelled by 100 people to an event is summarised below.
| Distance (nearest mile) | Frequency |
|---|---|
| 0 – 9 | 4 |
| 10 – 14 | 19 |
| 15 – 18 | 41 |
| 19 – 20 | 26 |
| 21 – 25 | 9 |
A histogram was drawn and the bar representing the 10 – 14 class has a width of 3 cm and a height of 1.9 cm.
Find the width and height of the bar representing the 15 – 18 class.
Find the width and height of the bar representing the 19 – 20 class.
121 exam-style questions on OCR A Level Maths 2.2 Data Presentation and Interpretation, covering 2.2.1 Tables and diagrams for single variable data, 2.2.2 Area in a histogram, 2.2.3 Scatter diagrams and regression lines, 2.2.4 Informal interpretation of correlation, 2.2.5 Correlation and causation, 2.2.6 Measures of average and spread, 2.2.7 Calculations of mean and standard deviation, 2.2.8 Outliers, 2.2.9 Selecting or critiquing data presentation, and 2.2.10 Cleaning data. Each one has a worked solution and a mark scheme showing where the marks go.