Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Name | Years | Area | Authority | Decile | Roll |
| --- | --- | --- | --- | --- | --- |
| Buller High School | 9–15 | Westport | State | 3.0 | 361.0 |
| Granity School | 1–8 | Granity | State | 4.0 | 37.0 |
| Inangahua Junction School | 1–6 | Inangahua Junction | State | 6.0 | 14.0 |
| Karamea Area School | 1–15 | Karamea | State | 5.0 | 93.0 |
| Maruia School | 1–8 | Maruia | State | 9.0 | 19.0 |
| Reefton Area School | 1–15 | Reefton | State | 3.0 | 206.0 |
| Sacred Heart School | 1–8 | Reefton | State integrated | 4.0 | 34.0 |
| St Canice's School | 1–8 | Westport | State integrated | 4.0 | 160.0 |
| Waimangaroa School | 1–8 | Waimangaroa | State | 2.0 | 18.0 |
| Westport North School | 1–8 | Westport | State | 4.0 | 260.0 |
| Westport South School | 1–8 | Westport | State | 4.0 | 274.0 |
Question:
What is the average roll of a school with state authority and a decile of 9?
Answer:
19.0