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

### Instruction:
Name the average pop for chūgoku and prefecture of okayama

### Inputs:
table_name: table, columns: ['Capital', 'Prefecture', 'Region', 'Island', 'Pop. ¹']

### Response:
SELECT AVG Pop. ¹ FROM table WHERE Region = chūgoku AND Prefecture = okayama