If a married employee has a western name style, what is the probability of him or her working as a store contact?
married refers to MaritalStatus = 'M'; western name style refers to NameStyle = 0; store contact refers to PersonType = 'SC'; probability = Divide (Count (BusinessEntityID( PersonType = 'SC' & MaritalStatus = 'M')), Count (BusinessEntityID ( PersonType) & MariatlStatus = 'M'))

SELECT CAST(COUNT(IIF(T1.PersonType = 'SC', T1.PersonType, NULL)) AS REAL) / COUNT(T1.PersonType) FROM Person AS T1 INNER JOIN Employee AS T2 WHERE T1.PersonType = 'SC' AND T1.NameStyle = 0 AND T2.MaritalStatus = 'M'