CREATE TABLE table_20534 ("#" FLOAT, "Air Date" TEXT, "Timeslot" TEXT, "Rating" TEXT, "Share" FLOAT, "18-49" TEXT, "Viewers" TEXT, "Weekly Rank" TEXT)

How many episodes have a weekly rank tba and are broadcast at 8:00 p.m.?
SELECT COUNT("#") FROM table_20534 WHERE "Weekly Rank" = 'TBA' AND "Timeslot" = '8:00 P.M.'
SELECT COUNT("#") FROM "table_20534" WHERE "Timeslot" = '8:00 P.M.' AND "Weekly Rank" = 'TBA'