What was Montenegro's average bronze with less than 7 silver and more than 4 golds?
CREATE TABLE "medal_table" (
  "nation" text,
  "gold" real,
  "silver" real,
  "bronze" real,
  "total" real
);
SELECT AVG("bronze") FROM "medal_table" WHERE "silver"<7 AND "nation"='montenegro' AND "gold">4;