Basia records the colour of 100 cars passing the school gate. Her results are recorded in the table. | Colour of car | Black | Grey | Red | Blue | Other | |---|---|---|---|---|---| | Frequency | 43 | 18 | 12 | 9 | 18 |

1. (a)Use Basia's results to estimate the probability that the next car seen is a blue car.[1]
2. (b)In the next hour, 500 cars pass the school gate. Use Basia's results to estimate the number of these cars that are red.[1]
3. (c)Colin records the colour of the next 100 cars passing the school gate. His results are shown in the table below. | Colour of car | Black | Grey | Red | Blue | Other | |---|---|---|---|---|---| | Frequency | 34 | 10 | 18 | 28 | 10 | Use Basia's and Colin's combined results to estimate the number of red cars that would be seen when 500 cars pass the school gate.[1]
4. (d)Which of the estimates in part (b) or in part (c) is likely to be the best? Give a reason for your decision. The best estimate is ___________ because ___________[1]