Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_15511178_3 (winning_driver VARCHAR, rd VARCHAR)
### Question:
how many winners were in round 8
### Answer:
SELECT COUNT(winning_driver) FROM table_15511178_3 WHERE rd = 8