CREATE TABLE table_74715 ("Week" FLOAT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Attendance" FLOAT)

What is the average week number of all the matches where less than 22,604 people attended?
SELECT AVG("Week") FROM table_74715 WHERE "Attendance" < '22,604'
SELECT AVG("Week") FROM "table_74715" WHERE "Attendance" < '22,604'