David recorded the age of 10 used cars and their resale value in thousands of pounds (£). The information is shown on the scatter graph.
| Age (years) | Value (£1000s) |
|---|---|
| 1 | 20 |
| 2 | 17 |
| 3 | 16 |
| 4 | 13 |
| 5 | 11 |
| 6 | 10 |
| 7 | 7 |
| 8 | 6 |
| 9 | 4 |
| 10 | 2 |
What type of correlation does the scatter graph show?
Another used car has a resale value of £9,000. Estimate the age of this car.
