CREATE TABLE table_53399 ("Date" TEXT, "Opponent" TEXT, "Score" TEXT, "Loss" TEXT, "Attendance" FLOAT, "Record" TEXT)

What was the attendance on July 30?
SELECT AVG("Attendance") FROM table_53399 WHERE "Date" = 'july 30'
SELECT AVG("Attendance") FROM "table_53399" WHERE "Date" = 'july 30'