Write SQL query to solve given problem: What is the percentage of users who experienced event number 6 who have the app installed but do not use the app?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT SUM(IIF(is_installed = 1 AND is_active = 0, 1, 0)) / COUNT(app_id) AS perrcent FROM app_events WHERE event_id = 6