CREATE TABLE table_68928 ("Year" FLOAT, "Entrant" TEXT, "Chassis" TEXT, "Engine" TEXT, "Points" FLOAT)

What is the average points of a Cosworth v8 engine in 1973.
SELECT AVG("Points") FROM table_68928 WHERE "Engine" = 'cosworth v8' AND "Year" = '1973'
SELECT AVG("Points") FROM "table_68928" WHERE "Engine" = 'cosworth v8' AND "Year" = '1973'