CREATE TABLE table_11593 ("Rider" TEXT, "Bike" TEXT, "Laps" FLOAT, "Time" TEXT, "Grid" FLOAT)

What is the mean number of laps when the grid was 8?
SELECT AVG("Laps") FROM table_11593 WHERE "Grid" = '8'
SELECT AVG("Laps") FROM "table_11593" WHERE "Grid" = '8'