CREATE TABLE table_52703 ("Player" CLOB, "Rec." FLOAT, "Yards" FLOAT, "Avg." FLOAT, "TD's" FLOAT, "Long" FLOAT)

Which largest average had 1229 yards?
SELECT MAX("Avg.") FROM table_52703 WHERE "Yards" = '1229'
SELECT MAX("Avg.") FROM "table_52703" WHERE "Yards" = '1229'