Write SQL query to solve given problem: Calculate average scene per act in Antony and Cleopatra.. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT CAST(SUM(T2.Scene) AS REAL) / COUNT(T2.act) FROM works AS T1 INNER JOIN chapters AS T2 ON T1.id = T2.work_id WHERE T1.Title = 'Antony and Cleopatra'