What is the average Barrow Island Australia when Draugen north sea is 17 and Mutineer-Exeter Australia is smaller than 6?
CREATE TABLE "typical_heavy_naphtha_feedstocks" (
  "crude_oil_name_rightarrow_location_rightarrow" text,
  "barrow_island_australia" real,
  "mutineer_exeter_australia" real,
  "cpc_blend_kazakhstan" real,
  "draugen_north_sea" real
);
SELECT AVG("barrow_island_australia") FROM "typical_heavy_naphtha_feedstocks" WHERE "draugen_north_sea"=17 AND "mutineer_exeter_australia"<6;