The masses, m m\,m kg, of 50 cars are summarised in the table below.
| Mass (kg) | Frequency |
|---|---|
| 1000<m≤12001000 < m \le 12001000<m≤1200 | 8 |
| 1200<m≤14001200 < m \le 14001200<m≤1400 | 22 |
| 1400<m≤16001400 < m \le 16001400<m≤1600 | 14 |
| 1600<m≤20001600 < m \le 20001600<m≤2000 | 6 |
Estimate the mean mass of these cars.
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.