Average Line for Line and Stack Chart

So the issue is with Average function not able to pick up the measure of: 

AVERAGE ( 'Incidental Findings Note'[Incidental Findings Note Type Compliance] )

Here is the error:  The AVERAGE function only accepts a column reference as an argument.

The breakdown of the measures are as below:

Incidental Findings Note Type Compliance = [Sum of Discharge Patients w Note Type IF]/[Sum of Incidental Findings MRN]

Sum of Discharge Patients w Note Type IF = CALCULATE(COUNT('Distinct MRN for Incident Findings Note Type'[MRN]), 'Distinct MRN for Incident Findings Note Type'[Incidental Both] = 1)

Sum of Incidental Findings MRN = DISTINCTCOUNT('Table1 (2)'[MRN])

I have tried AVERAGEX to capture the measure and still could not get the correct average.  Let me know if that helps. I will try to provide a sample pbix file. The issue is private health information data in the file.