Count Average based on values from table visual

Hello, 
I have a table visual, which is filtered by using different options. The first filter is set on the right bar, where I filter "Status" and "New Value". The next filter is set in "Columns" section, where I filter First Closed Date by using Earliest keyword (case can be opened several times, I need to know only first closed date).

I have a measure "First Resolution Date Business Hours". My task is to count average for this measure.
To count average I am using this measure: 

measure_AverageFirstResolutionDateHours = 
    DIVIDE(
        -- returns sum of values in measure FirstResolutionHours
        SUMX(
            cps_sfdc_cases_history,
            [measure_FirstResolutionHours_Optimized]
        ),
        COUNTROWS(
            FILTER(
                cps_sfdc_cases_history,
                NOT(ISBLANK([measure_FirstResolutionHours_Optimized]))
            )
        ),
        0 -- Default value if the denominator is 0
    )

After I decided to filter table in order to have a small sample which helps me check if average is correct. I am getting incorrect average. The answer is 2.06, but should be 2.12:

The question is how I can count average of measure First Resolution Date Business Hours based on table visual, not table itself?