CREATE TABLE table_58480 ("Driver" TEXT, "Constructor" TEXT, "Laps" FLOAT, "Time/Retired" TEXT, "Grid" FLOAT)

What is the average grid for Clay Regazzoni?
SELECT AVG("Grid") FROM table_58480 WHERE "Driver" = 'clay regazzoni'
SELECT AVG("Grid") FROM "table_58480" WHERE "Driver" = 'clay regazzoni'