The number of hours spent revising and the test scores of 10 students are recorded. The scatter graph shows this information.
| Revision hours (h) | Test score (%) |
|---|---|
| 1 | 20 |
| 3 | 35 |
| 5 | 42 |
| 7 | 55 |
| 8 | 60 |
| 10 | 25 |
| 12 | 75 |
| 14 | 82 |
| 15 | 88 |
| 18 | 95 |
a.[1]
What type of correlation does the scatter graph show?
b.[1]
One of the points is an outlier. Write down the coordinates for this point.
c.[2]
Another student spent 9 hours revising. Estimate the test score for this student.