Which average S.R. has an Average of 39.13 and Balls Faced larger than 318?
CREATE TABLE "australia" (
  "name" text,
  "innings" real,
  "runs_scored" real,
  "balls_faced" real,
  "average" real,
  "s_r" real
);
SELECT AVG("s_r") FROM "australia" WHERE "average"=39.13 AND "balls_faced">318;