The CO2 _2\,2 emissions, x x\,x g/km, of 200 cars are summarised in the table below, where p p\,p and q q\,q are positive integers.
| CO2 _2\,2 emission (g/km) | Frequency |
|---|---|
| 100≤x<140100 \le x < 140100≤x<140 | 24 |
| 140≤x<180140 \le x < 180140≤x<180 | 60 |
| 180≤x<220180 \le x < 220180≤x<220 | ppp |
| 220≤x<260220 \le x < 260220≤x<260 | qqq |
| 260≤x<300260 \le x < 300260≤x<300 | 16 |
Using the class midpoints, the estimated mean CO2 _2\,2 emission is exactly 190 g/km.
Find the value of p p\,p and the value of qqq.
Use linear interpolation to estimate the median CO2 _2\,2 emission.
105 exam-style questions on WJEC A Level Maths 2.2 Data presentation and interpretation, covering 2.2.1 Data presentation and interpretation, 2.2.2 Data presentation and interpretation, 2.2.3 Data presentation and interpretation, 2.2.4 Data presentation and interpretation, 2.2.5 Data presentation and interpretation, 2.2.6 Data presentation and interpretation, 2.2.7 Data presentation and interpretation, 2.2.8 Data presentation and interpretation, and 2.2 Data presentation and interpretation. Each one has a worked solution and a mark scheme showing where the marks go.