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:
| Rank | Nation | Gold | Silver | Bronze | Total |
| --- | --- | --- | --- | --- | --- |
| 1 | Soviet Union | 11.0 | 2.0 | 4.0 | 17.0 |
| 2 | Poland | 3.0 | 2.0 | 1.0 | 6.0 |
| 3 | East Germany | 2.0 | 0.0 | 2.0 | 4.0 |
| 4 | Bulgaria | 1.0 | 6.0 | 4.0 | 11.0 |
| 5 | Romania | 1.0 | 3.0 | 1.0 | 5.0 |
| 6 | United States | 1.0 | 0.0 | 3.0 | 4.0 |
| 7 | Sweden | 1.0 | 0.0 | 0.0 | 1.0 |
| 8 | Yugoslavia | 0.0 | 1.0 | 2.0 | 3.0 |
| 9 | Cuba | 0.0 | 1.0 | 1.0 | 2.0 |
| 9 | Hungary | 0.0 | 1.0 | 1.0 | 2.0 |
| 11 | Canada | 0.0 | 1.0 | 0.0 | 1.0 |
| 11 | Czechoslovakia | 0.0 | 1.0 | 0.0 | 1.0 |
| 11 | Japan | 0.0 | 1.0 | 0.0 | 1.0 |
| 11 | Turkey | 0.0 | 1.0 | 0.0 | 1.0 |
| 15 | South Korea | 0.0 | 0.0 | 1.0 | 1.0 |
| Total | Total | 20.0 | 20.0 | 20.0 | 60.0 |
Question:
What is the average Total when silver is less than 1, and the rank is 15?
Answer:
1.0