CREATE TABLE table_204_975 (id NUMBER, "year" NUMBER, "competition" CLOB, "location" CLOB, "event" CLOB, "final-rank" CLOB, "final-score" NUMBER, "qualifying rank" NUMBER, "qualifying score" NUMBER)

what was the average qualifying score for the u.s. championships ?
SELECT AVG("qualifying score") FROM table_204_975 WHERE "competition" = 'u.s. championships'
SELECT AVG("qualifying score") FROM "table_204_975" WHERE "competition" = 'u.s. championships'