Average between dates

Tomas1212 - Well, you are going to put your "customer" column in a table or matrix visualization and then create a measure that probably uses AVERAGEX at some point. 

Please first check if your issue is a common issue listed here: https://community.powerbi.com/t5/Community-Blog/Before-You-Post-Read-This/ba-p/1116882

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The most important parts are:
1. Sample data as text, use the table tool in the editing bar
2. Expected output from sample data
3. Explanation in words of how to get from 1. to 2.