Are the 0 and Null fields real values or some "other issue"?
I defer to June7 re Nulls and aggregate calculations.
Where are these functions you wish to use?
There may be an Excel expert here who can tell us more about the possibility of calling and using Excel functions from Access. My knowledge of Excel is extremely limited.
I have done this when helping someone, so in concept ...
Code:
Sub xlChiInv()
Dim obj As Excel.Application
10 Set obj = CreateObject("Excel.Application")
20 MsgBox obj.Application.ChiInv(0.05, 10)
30 obj.Quit
40 Set obj = Nothing
End Sub
You may find some ideas at this link.