user: Question: How many Deciles are coed?
Columns: ['Name', 'Years', 'Gender', 'Area', 'Authority', 'Decile']
Types: ['text', 'text', 'text', 'text', 'text', 'real']
Sample row: ['Kawerau Putauaki School', '1–8', 'Coed', 'Kawerau', 'State', 1.0]
SQL:

assistant: SELECT COUNT("Decile") FROM "Table" WHERE "Gender" = 'coed';