The scatter graph shows the age and height of 12 children in a primary school.
| Age (years) | Height (cm) |
|---|---|
| 2 | 86 |
| 3 | 94 |
| 3 | 98 |
| 4 | 102 |
| 5 | 108 |
| 6 | 114 |
| 6 | 118 |
| 7 | 122 |
| 8 | 130 |
| 9 | 136 |
| 9 | 140 |
| 10 | 145 |
a.[1]
What type of correlation does the scatter graph show?
b.[2]
Another child is 5.5 years old. Estimate the height of this child.