Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
How many deciles have a Gender of coed, an Authority of state, and a Name of mount maunganui school?

### Inputs:
table_name: table, columns: ['Name', 'Gender', 'Area', 'Authority', 'Decile']

### Response:
SELECT SUM Decile FROM table WHERE Gender = coed AND Authority = state AND Name = mount maunganui school