user: Question: What is the mean evening gown number when the average is 8.686?
Columns: ['State', 'Interview', 'Swimsuit', 'Evening Gown', 'Average']
Types: ['text', 'real', 'real', 'real', 'real']
Sample row: ['Michigan', 9.261, 9.364, 9.489, 9.371]
SQL:

assistant: SELECT AVG("Evening Gown") FROM "Table" WHERE "Average" = 8.686;