CREATE TABLE table_147 ("Team" TEXT, "Stadium" TEXT, "Capacity" FLOAT, "Highest" FLOAT, "Lowest" FLOAT, "Average" FLOAT)

The firs park stadium had the lowest average attendence of what?
SELECT MIN("Average") FROM table_147 WHERE "Stadium" = 'Firs Park'
SELECT MIN("Average") FROM "table_147" WHERE "Stadium" = 'Firs Park'