user: Question: What is the average amount of silver medals montenegro, who has less than 15 bronze and more than 11 total medals, has?
Columns: ['Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['text', 'real', 'real', 'real', 'real']
Sample row: ['Luxembourg', 36.0, 39.0, 31.0, 106.0]
SQL:

assistant: SELECT AVG("Silver") FROM "Table" WHERE "Bronze" < 15.0 AND "Nation" = 'montenegro' AND "Total" > 11.0;