Average from calculated measure

I have a calculated measure to return the date diff from from different rows based on job, status, and date. But I also need the measure to average when in Values field in the matrix visual.

Table 1:

Table 2:

Calucated Measure:

Days Confirmed to Shipped =

VAR M =

    CALCULATE(

        MAX('(a) Table 1’[changed_date]),

        FILTER(ALL('Table 1’),'Table 1’ [Job Id] = MAX(Table 1’[Job ID])),

        FILTER(

        'Table 2’,

            'Table 2’[name] = "Shipped"

            )  

    )

VAR N =

CALCULATE(

        MIN('Table 1’[changed_date]),

        FILTER(ALL('Table 1),'Table 1’[Job Id] = MAX(‘Table 1’[Job Id])),

        FILTER(

        'Table 2,

            'Table 2’[name] = "Confirmed"

            )  

    )

Return

    IF(m=MAX('(a) national_work_instance_status_change'[changed_date]),DATEDIFF(N,M,DAY),0)

Thank you in advance for your help.