For averages of 1.58 and matches under 38, what is the average number of goals?
CREATE TABLE "zamora_trophy" (
  "goalkeeper" text,
  "goals" real,
  "matches" real,
  "average" real,
  "team" text
);
SELECT AVG("goals") FROM "zamora_trophy" WHERE "average"=1.58 AND "matches"<38;