CREATE TABLE table_42791 ("Name" TEXT, "Innings" FLOAT, "Runs Scored" FLOAT, "Balls Faced" FLOAT, "Average" FLOAT, "S.R." FLOAT)

Which average S.R. has an Average of 39.13 and Balls Faced larger than 318?
SELECT AVG("S.R.") FROM table_42791 WHERE "Average" = '39.13' AND "Balls Faced" > '318'
SELECT AVG("S.R.") FROM "table_42791" WHERE "Average" = '39.13' AND "Balls Faced" > '318'