CREATE TABLE table_51301 ("Driver" TEXT, "Constructor" TEXT, "Laps" FLOAT, "Time/Retired" TEXT, "Grid" FLOAT)

What's the average laps driven by david coulthard?
SELECT AVG("Laps") FROM table_51301 WHERE "Driver" = 'david coulthard'
SELECT AVG("Laps") FROM "table_51301" WHERE "Driver" = 'david coulthard'