The CO emissions, x x\,x g/km, of 240 cars are summarised in the table below.
| CO emission (g/km) | Frequency |
|---|---|
| 0.0≤x<0.10.0 \le x < 0.10.0≤x<0.1 | 24 |
| 0.1≤x<0.20.1 \le x < 0.20.1≤x<0.2 | 60 |
| 0.2≤x<0.30.2 \le x < 0.30.2≤x<0.3 | 72 |
| 0.3≤x<0.50.3 \le x < 0.50.3≤x<0.5 | 60 |
| 0.5≤x<0.90.5 \le x < 0.90.5≤x<0.9 | 24 |
One of these 240 cars is selected at random. Estimate the probability that its CO emission is between 0.15 g/km and 0.35 g/km.
Two of these 240 cars are selected at random without replacement. Estimate the probability that both have a CO emission of more than 0.5 g/km.
State one assumption you have made in answering part (a).
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.