CREATE TABLE table_69621 ("Year" FLOAT, "Entrant" TEXT, "Chassis" TEXT, "Engine" TEXT, "Points" FLOAT)

Name the sum of points for chassis of maserati 250f and entrant of officine alfieri maserati
SELECT SUM("Points") FROM table_69621 WHERE "Chassis" = 'maserati 250f' AND "Entrant" = 'officine alfieri maserati'
SELECT SUM("Points") FROM "table_69621" WHERE "Chassis" = 'maserati 250f' AND "Entrant" = 'officine alfieri maserati'