CREATE TABLE table_46675 ("Rank" FLOAT, "Nation" CLOB, "Gold" FLOAT, "Silver" FLOAT, "Bronze" FLOAT, "Total" FLOAT)

What was the average rank for south africa when they had more than 8 silver medals?
SELECT AVG("Rank") FROM table_46675 WHERE "Nation" = 'south africa' AND "Silver" > '8'
SELECT AVG("Rank") FROM "table_46675" WHERE "Nation" = 'south africa' AND "Silver" > '8'