What is the average Total when the ship was lützow, with a 13.5-inch/1400lb smaller than 0?
CREATE TABLE "hits_on_german_ships" (
  "ship" text,
  "13_5_inch_1400lb" real,
  "13_5_inch_1250lb" real,
  "12_inch" real,
  "total" real
);
SELECT AVG("total") FROM "hits_on_german_ships" WHERE "ship"='lützow' AND "13_5_inch_1400lb"<0;