user: Question: What is the avg start that starts at 30?
Columns: ['Year', 'Starts', 'Wins', 'Top 5', 'Top 10', 'Poles', 'Avg. Start', 'Avg. Finish', 'Winnings', 'Position', 'Team(s)']
Types: ['real', 'real', 'real', 'real', 'real', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1989.0, 17.0, 0.0, 0.0, 3.0, 0.0, '26.5', '23.6', '$121,065', '34th', '#88 Baker-Schiff Racing']
SQL:

assistant: SELECT "Avg. Start" FROM "Table" WHERE "Starts" = 30.0;