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:
| Year | Class | Team | Points | Wins |
| --- | --- | --- | --- | --- |
| 1970.0 | 250cc | Yamaha | 0.0 | 0.0 |
| 1970.0 | 350cc | Yamaha | 0.0 | 0.0 |
| 1971.0 | 250cc | Yamaha | 9.0 | 0.0 |
| 1971.0 | 350cc | Yamaha | 33.0 | 0.0 |
| 1972.0 | 250cc | Yamaha | 28.0 | 0.0 |
| 1972.0 | 350cc | Yamaha | 17.0 | 0.0 |
| 1973.0 | 250cc | Yamaha | 20.0 | 0.0 |
| 1973.0 | 350cc | Yamaha | 17.0 | 0.0 |
Question:
Count the average Wins which has a Class of 250cc, and a Year of 1972?
Answer:
0.0