What is the sum of all the points won by Peter Whitehead in an alta f2 Chassis?
CREATE TABLE table_70946 (
    "Year" real,
    "Entrant" text,
    "Chassis" text,
    "Engine" text,
    "Points" real
)
SELECT SUM("Points") FROM table_70946 WHERE "Entrant" = 'peter whitehead' AND "Chassis" = 'alta f2'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the sum of all the points won by Peter Whitehead in an alta f2 Chassis? ### Input: CREATE TABLE table_70946 (
    "Year" real,
    "Entrant" text,
    "Chassis" text,
    "Engine" text,
    "Points" real
) ### Response: SELECT SUM("Points") FROM table_70946 WHERE "Entrant" = 'peter whitehead' AND "Chassis" = 'alta f2'