Measures not calculating sum in matrix

DAX DAX Calculations
37

Hi Sam,
Its all good in theory.
I get the number of entrants correct

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but the average is up the creek.

Average = 
CALCULATE(
    AVERAGEX('Average Entrance', [Number of Entrants]),
    USERELATIONSHIP(Dates[Date],'Average Entrance'[Confirmation Date])
)

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Last I checked 2 / 4 is 0.5 - not 1.0