CREATE TABLE table_38721 ("Week" FLOAT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Attendance" FLOAT)

What was the average attendance on October 30, 1938?
SELECT AVG("Attendance") FROM table_38721 WHERE "Date" = 'october 30, 1938'
SELECT AVG("Attendance") FROM "table_38721" WHERE "Date" = 'october 30, 1938'