Crystal Report. Need to get average of number of days to complete work order Part two

I closed out of my former question because I thought I had it worked out but it turns out I did not. I feel like I am close but the number being given as the average for the number of WORKING days is not correct. Here is a link to the original post/question.

http://www.experts-exchange.com/Database/Reporting_/Crystal_Reports/Q_27035326.html

I am using the formula I attached. It is supposed to return the number of working days between the PO Request Date and the Completion date. I named the formula above DaysDifference. I went to the Insert menu and selected Sum. I selected the @DaysDifference formula and set it to average.

I have a few vendors who only have one work order in the system. One vendor in particular had 10 working days between the Request Date and Completion Date if you subtract the weekends. The average was returned as 12.

Thanks for any insight you can provide!

//DaysDifference...Gives me the number of days
WhilePrintingRecords;
Global NumberVar TotalDaysToCompletion;
Global NumberVar WorkOrderCount;
Local NumberVar DaysDiff;
Global DateVar Array Holidays;
Local NumberVar FullDays;
Local NumberVar BankHolidays;
Local NumberVar Weekends;
Local NumberVar i;
Local Datevar StartDate := {WOHeader.RequestDate};//put your date here;
Local DateVar EndDate := {WOHeader.ComplDate};

    (
    //Count the number of full days between dates
    Fulldays := DateDiff ('d',StartDate,EndDate);

    //Count any holidays between dates
    For i := 1 to Ubound(holidays)
    Do
        If Holidays[i] >= StartDate and Holidays[i] <= EndDate Then
            BankHolidays := BankHolidays + 1;

    //Count any weekends between dates
    Weekends := DateDiff("ww", StartDate, EndDate, crsaturday) + 
                DateDiff("ww", StartDate, EndDate, crsunday)
    );

//Calculate Working days
DaysDiff := FullDays - Weekends - BankHolidays;
TotalDaysToCompletion := TotalDaysToCompletion + DaysDiff;
WorkOrderCount := WorkOrderCount  + 1;
DaysDiff

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