user: Question: Name the average zone for Waddon Marsh tram stop
Columns: ['Stations', 'Place', 'Managed By', 'Platforms', 'Zone']
Types: ['text', 'text', 'text', 'real', 'real']
Sample row: ['Waddon Marsh tram stop', 'Waddon', 'Tramlink', 2.0, 5.0]
SQL:

assistant: SELECT AVG("Zone") FROM "Table" WHERE "Stations" = 'Waddon Marsh tram stop';