Aggregate by more than one column with added filter

I have a data set like this with 5 columns:

Group,  Color, Serial Number, Month, count

I have to find the SUM and AVERAGE , grouped by Group and Color : 

• Group A - Color
• Group A- Black & white
• Group B- Color
• Group - Black & White

The table BI visualization needs to show:

Group , Color , Serial Number, Month, count, Calculated SUM, Calculated AVERAGE

I need the following filters on the top

• Group Filter
• Color Filter
• Month Filter

My current measures:

SumValue = CALCULATE(SUM(TestData[Print Count]),ALLSELECTED(TestData),GROUPBY(TestData,TestData[Model Group],TestData[Print Mode]))

AvgValue = CALCULATE(AVERAGE(TestData[Print Count]),ALLSELECTED(TestData),GROUPBY(TestData,TestData[Model Group],TestData[Print Mode]))

The problem is :

When I display the SUM and AVERAGE in the table view with the rest of the fields:

If I have ALL, ALL , ALL - for group, color and month, the sum and average are the same across group/color combo

If I have group-Selected, color = SELECTED and MONTH = ALL, , the sum and average are the same across group/color combo

If I have either group or color selected with MONTH selection, then the sum and averages are no longer the same in the group/color combo.

How do I make the group / print filter work with the Month filter to show the same mean for every row in the table ?

PS: I need the mean at the table level .

Am I missing something ?