What is that average amount silver medal Montenegro, who have less than 15 bronze and more than 11 total medal, have?
Nation Gold Silver Bronze Total
2013 Games of the Small States of Europe
11729736
text real real real real
2-11729736-4
Medal table
Medal table
Luxembourg 36 39 31 106
Iceland 28 29 30 87
Cyprus 28 17 24 69
Liechtenstein 11 16 8 35
Montenegro 9 0 2 11
Monaco 7 8 15 30
Malta 2 11 13 26
Andorra 2 1 3 6
San Marino 1 4 9 14
Total 124 125 135 384
SELECT AVG Silver FROM table WHERE Bronze < 15 AND Nation = montenegro AND Total > 11
15 montenegro 11