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Default Average a group of numbers within an date range.

I have a spreadsheet that has tickets for an entire year. I have calculated
a field that has the total number of days a ticket was open for each ticket.
I am trying to average the total number of days a ticket is open by month,
to have an average number of days a ticket is open per month. I have tried
this calculation but am not getting a valid number. My dates are in
month/day/year format. 01/01/09. Thanks for your help

=IF(B2=0,0,(AVERAGE(IF((MONTH(Data!$O$3:$O$4834)=1 )*(YEAR(Data!$O$3:$O$4834)=2009),(Data!$AT$3:$AT$4 834)))))
 
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