Calculating average for Scorecard

I have created a Scorecard table called "Data Entry" which is calculating the average of Four (4) columns which are "[Customer Engagement]", "[Issue Resolution]" ,"[Process Compliance]","[Customer Handling]" 

I am trying to modify the App-sheet formula in such a way, that if I do not select a value for any column, I still get the overall average for the Table.

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