CREATE TABLE table_13703 ("Season" TEXT, "High" FLOAT, "Average" FLOAT, "Total" FLOAT, "League Ranking" TEXT)

What's the average that has a total more than 263,648, a high of 31,564, and ranking of 1st?
SELECT SUM("Average") FROM table_13703 WHERE "League Ranking" = '1st' AND "Total" > '263,648' AND "High" = '31,564'
SELECT SUM("Average") FROM "table_13703" WHERE "High" = '31,564' AND "League Ranking" = '1st' AND "Total" > '263,648'