user: Question: What is Masten Gregory's average lap?
Columns: ['Driver', 'Constructor', 'Laps', 'Time/Retired', 'Grid']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Stirling Moss', 'Cooper - Climax', 62.0, '2:11:55.41', 1.0]
SQL:

assistant: SELECT AVG("Laps") FROM "Table" WHERE "Driver" = 'Masten Gregory';