CREATE TABLE table_6545 ("Week" FLOAT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Attendance" FLOAT)

What week of the season had a date of october 5, 1975?
SELECT MIN("Week") FROM table_6545 WHERE "Date" = 'october 5, 1975'
SELECT MIN("Week") FROM "table_6545" WHERE "Date" = 'october 5, 1975'