user: Question: How many races went for 10 rounds?
Columns: ['Rnd', 'Circuit', 'Location', 'Date', 'Pole position', 'Fastest lap', 'Most laps led', 'Winning driver', 'Winning team', 'Supporting']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1', 'Streets of St. Petersburg', 'St. Petersburg, Florida', 'March 27', 'Sage Karam', 'Sage Karam', 'Sage Karam', 'Sage Karam', 'Andretti Autosport', 'IndyCar']
SQL:

assistant: SELECT COUNT("Fastest lap") FROM "Table" WHERE "Rnd" = '10';