Скользящее среднее за 3 месяца

Мне нужна помощь в вычислении скользящей средней стоимости за 3 месяца из двух наборов данных ниже. Это среднее значение за 3 месяца для набора данных 1 / набора данных 2. Я не уверен, что использование cte является правильным маршрутом. Любое понимание приветствуется.

  Dataset 1:

        SELECT(factAdmissions.ContractCode + '-' +factAdmissions.BenefitPlanCode) AS [Contract Code],
        factAdmissions.AdmitCCYYMM,
        ISNULL(sum(AmountPaid),0)As [Amount Paid]
        FROM factAdmissions

        WHERE factAdmissions.AdmitCCYYMM >='200701'
        AND factAdmissions.AcuteSNFIndAdmit ='a'
        AND factAdmissions.ContractCode Is Not Null
        AND factAdmissions.BenefitPlanCode Is Not Null
        AND BusinessUnitCode In('EP','HF', 'VN')
        AND AdmitCCYYMM BETWEEN (@StartDate) AND (@EndDate)

        AND factAdmissions.ContractCode + '-' +factAdmissions.BenefitPlanCode IN (@Product)

        Group by factAdmissions.ContractCode,
        factAdmissions.BenefitPlanCode,
        factAdmissions.AdmitCCYYMM
        Order by factAdmissions.ContractCode,
        factAdmissions.BenefitPlanCode,
        factAdmissions.AdmitCCYYMM;



        Dataset2:

        Select

        (factMembership.ContractCode+'-'+ factMembership.BenefitPlanCode) As Product,
        EffectiveCCYYMM,
        ISNULL(count(Distinct MemberId),0) As MemberCount
        From factMembership
        Where EffectiveCCYYMM >= '200701'
        AND BusinessUnitCode In('EP','HF', 'VN')
        AND EffectiveCCYYMM BETWEEN (@StartDate) AND (@EndDate)

        AND factMembership.ContractCode + '-' +factMembership.BenefitPlanCode IN (@Product)


        Group by
        ContractCode,
        BenefitPlanCode,
        EffectiveCCYYMM

        Order by 1; 

    Dataset 1: Output 201101 201102 201103
    Cost $420,627 $73,608 $93,792 


    Dataset 2:Output 201103
    Memberscount 400



    Desired Output: 201103 
    3 Month Rolling Average $490.02