What is the number of pole position with a round of 15?
CREATE TABLE table_1137707_2 (pole_position VARCHAR, round VARCHAR)
SELECT COUNT(pole_position) FROM table_1137707_2 WHERE round = 15
### Context: CREATE TABLE table_1137707_2 (pole_position VARCHAR, round VARCHAR) ### Question: What is the number of pole position with a round of 15? ### Answer: SELECT COUNT(pole_position) FROM table_1137707_2 WHERE round = 15