Question: What is the average number of territories do each sales representative is in charge of?
SQL: SELECT CAST(COUNT(T2.TerritoryID) AS REAL) / COUNT(DISTINCT T1.EmployeeID) FROM Employees AS T1 INNER JOIN EmployeeTerritories AS T2 ON T1.EmployeeID = T2.EmployeeID WHERE T1.Title = 'Sales Representative'