The CO emissions, in g/km, of 150 petrol cars are summarised in the table below, where x x\,x is the CO emission in g/km.
| CO emission (g/km) | Frequency |
|---|---|
| 0.0≤x<0.10.0 \le x < 0.10.0≤x<0.1 | 15 |
| 0.1≤x<0.20.1 \le x < 0.20.1≤x<0.2 | 36 |
| 0.2≤x<0.40.2 \le x < 0.40.2≤x<0.4 | 60 |
| 0.4≤x<0.60.4 \le x < 0.60.4≤x<0.6 | 30 |
| 0.6≤x<1.00.6 \le x < 1.00.6≤x<1.0 | 9 |
Estimate the number of these cars with a CO emission of less than 0.3 g/km.
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.