How to create average formule based on different data

Hi Dcichy ,

May I ask if your problem has been solved. If the above reply was helpful, you may consider marking it as solution. If the problem is not yet solved, you can follow the steps below:

Add new measure:

result =
VAR _total =
    CALCULATE (
        SUM ( 'Table'[days] ),
        FILTER ( ALL ( 'Table' ), 'Table'[Task] = SELECTEDVALUE ( 'Table'[Task] ) )
    )
VAR _count =
    CALCULATE (
        COUNTROWS ( 'Table' ),
        FILTER ( ALL ( 'Table' ), 'Table'[Task] = SELECTEDVALUE ( 'Table'[Task] ) )
    )
RETURN
    _total / _count

Final output:

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Best Regards,

Ada Wang

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