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 | Gender | Area | Authority | Decile | Roll |
| --- | --- | --- | --- | --- | --- | --- |
| Allenton School | 1–6 | Coed | Ashburton | State | 8.0 | 343.0 |
| Ashburton Borough School | 1–8 | Coed | Ashburton | State | 7.0 | 371.0 |
| Ashburton Christian School | 1–8 | Coed | Elgin | State integrated | 10.0 | 89.0 |
| Ashburton College | 9–13 | Coed | Ashburton | State | 7.0 | 1154.0 |
| Ashburton Intermediate | 7–8 | Coed | Ashburton | State | 6.0 | 395.0 |
| Ashburton Netherby School | 1–6 | Coed | Netherby | State | 3.0 | 139.0 |
| Carew Peel Forest School | 1–6 | Coed | Carew | State | 10.0 | 70.0 |
| Chertsey School | 1–6 | Coed | Chertsey | State | 6.0 | 23.0 |
| Dorie School | 1–8 | Coed | Rakaia | State | 9.0 | 49.0 |
| Fairton School | 1–6 | Coed | Ashburton | State | 6.0 | 35.0 |
| Hampstead School | 1–6 | Coed | Ashburton | State | 4.0 | 327.0 |
| Hinds School | 1–8 | Coed | Hinds | State | 9.0 | 141.0 |
| Lauriston School | 1–6 | Coed | Lauriston | State | 9.0 | 85.0 |
| Longbeach School | 1–8 | Coed | Willowby | State | 9.0 | 147.0 |
| Mayfield School | 1–8 | Coed | Mayfield | State | 9.0 | 59.0 |
| Methven School | 1–6 | Coed | Methven | State | 9.0 | 231.0 |
| Mount Hutt College | 7–13 | Coed | Methven | State | 8.0 | 480.0 |
| Mt Somers Springburn School | 1–8 | Coed | Mount Somers | State | 10.0 | 87.0 |
| Our Lady of Snows School | 1–8 | Coed | Methven | State integrated | 10.0 | 71.0 |
| Rakaia School | 1–8 | Coed | Rakaia | State | 4.0 | 160.0 |
| St Joseph's School | 1–8 | Coed | Ashburton | State integrated | 8.0 | 229.0 |
| Tinwald School | 1–6 | Coed | Tinwald | State | 6.0 | 236.0 |
| Wakanui School | 1–8 | Coed | Ashburton | State | 8.0 | 80.0 |
Question:
How many deciles have an Authority of state and a Name of chertsey school?
Answer:
1.0