CREATE TABLE table_14303 ("Rank by average" FLOAT, "Competition finish" FLOAT, "Couple" TEXT, "Total" FLOAT, "Number of dances" FLOAT, "Average" FLOAT)

Name the sum of rank by average with competition finish more than 8 and average larger than 30
SELECT SUM("Rank by average") FROM table_14303 WHERE "Competition finish" > '8' AND "Average" > '30'
SELECT SUM("Rank by average") FROM "table_14303" WHERE "Average" > '30' AND "Competition finish" > '8'