CREATE TABLE table_11829 ("State" TEXT, "Preliminaries" FLOAT, "Interview" FLOAT, "Swimsuit" FLOAT, "Evening Gown" FLOAT, "Average" FLOAT)

What is the evening gown score of the contestant from the District of Columbia with preliminaries smaller than 8.647?
SELECT COUNT("Evening Gown") FROM table_11829 WHERE "Preliminaries" < '8.647' AND "State" = 'district of columbia'
SELECT COUNT("Evening Gown") FROM "table_11829" WHERE "Preliminaries" < '8.647' AND "State" = 'district of columbia'