user: Question: What is the average of all the wickets that were 27?
Columns: ['Player', 'County', 'Balls', 'Wickets', 'Average', 'Economy', 'BBI', '4wi', '5wi']
Types: ['text', 'text', 'real', 'real', 'text', 'text', 'text', 'real', 'real']
Sample row: ['Keith Boyce Category:Articles with hCards', 'Essex', 708.0, 26.0, '12.00', '2.54', '3/15', 0.0, 0.0]
SQL:

assistant: SELECT AVG("Average") FROM "Table" WHERE "Wickets" = 27.0;