SCHEMA:
CREATE TABLE table_175980_2 (viewers__in_millions_ VARCHAR, ranking VARCHAR, timeslot VARCHAR)
USER:
What is every value for viewers for ranking #51 for the Tuesday 9:00 p.m. timeslot?

QUERY:
SELECT viewers__in_millions_ FROM table_175980_2 WHERE ranking = "#51" AND timeslot = "Tuesday 9:00 p.m."