how many winners were in round 8
CREATE TABLE table_15511178_3 (winning_driver VARCHAR, rd VARCHAR)
SELECT COUNT(winning_driver) FROM table_15511178_3 WHERE rd = 8
### 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