CREATE TABLE table_58481 ("Driver" CLOB, "Constructor" CLOB, "Laps" FLOAT, "Time/Retired" CLOB, "Grid" FLOAT)

What is the average laps for the grid smaller than 21 for Renzo Zorzi?
SELECT AVG("Laps") FROM table_58481 WHERE "Grid" < '21' AND "Driver" = 'renzo zorzi'
SELECT AVG("Laps") FROM "table_58481" WHERE "Driver" = 'renzo zorzi' AND "Grid" < '21'