CREATE TABLE table_53884 ("Episode" CLOB, "Air Date" CLOB, "Timeslot" CLOB, "Rating" FLOAT, "Share" FLOAT, "18-49  ( Rating/Share ) " CLOB, "Viewers  ( m ) " FLOAT, "Rank  ( Timeslot ) " FLOAT, "Rank  ( Night ) " CLOB, "Rank  ( Overall ) " FLOAT)

What is the total number of Viewers with a Rank (Night) of n/a, and a Timeslot of 8:30 p.m.?
SELECT COUNT("Viewers (m)") FROM table_53884 WHERE "Rank (Night)" = 'n/a' AND "Timeslot" = '8:30 p.m.'
SELECT COUNT("Viewers (m)") FROM "table_53884" WHERE "Rank (Night)" = 'n/a' AND "Timeslot" = '8:30 p.m.'