CREATE TABLE table_70946 ("Year" FLOAT, "Entrant" TEXT, "Chassis" TEXT, "Engine" TEXT, "Points" FLOAT)

What is the sum of all the points won by Peter Whitehead in an alta f2 Chassis?
SELECT SUM("Points") FROM table_70946 WHERE "Entrant" = 'peter whitehead' AND "Chassis" = 'alta f2'
SELECT SUM("Points") FROM "table_70946" WHERE "Chassis" = 'alta f2' AND "Entrant" = 'peter whitehead'