What is The average Total one when silver less than 1, and rank 15?
Rank Nation Gold Silver Bronze Total
1982 World Wrestling Championships
15772437
text text real real real real
2-15772437-1
Medal table
Medal table
1 Soviet Union 11 2 4 17
2 Poland 3 2 1 6
3 East Germany 2 0 2 4
4 Bulgaria 1 6 4 11
5 Romania 1 3 1 5
6 United States 1 0 3 4
7 Sweden 1 0 0 1
8 Yugoslavia 0 1 2 3
9 Cuba 0 1 1 2
9 Hungary 0 1 1 2
11 Canada 0 1 0 1
11 Czechoslovakia 0 1 0 1
11 Japan 0 1 0 1
11 Turkey 0 1 0 1
15 South Korea 0 0 1 1
Total Total 20 20 20 60
SELECT AVG Total FROM table WHERE Silver < 1 AND Rank = 15
1 15