CREATE TABLE table_11848 ("Driver" CLOB, "Constructor" CLOB, "Laps" FLOAT, "Time/Retired" CLOB, "Grid" FLOAT)

What was the average grid at the time Vanwall was constructor and there were 17 laps?
SELECT AVG("Grid") FROM table_11848 WHERE "Constructor" = 'vanwall' AND "Laps" = '17'
SELECT AVG("Grid") FROM "table_11848" WHERE "Constructor" = 'vanwall' AND "Laps" = '17'