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

### Instruction:
Count the average Wins which has a Class of 250cc, and a Year of 1972?

### Inputs:
table_name: table, columns: ['Year', 'Class', 'Team', 'Points', 'Wins']

### Response:
SELECT AVG Wins FROM table WHERE Class = 250cc AND Year = 1972