Queries :: Average Function In Query

I am currently designing a dashboard for my team which works on projects, I have a main table which has main fields which i use for my dashboard

Project Type,Project ID (Primary Key), Submitted by, Project Start date, Project end date, Status

The tricky part is that the raw data has projects which got started couple of years back some got closed in the previous fiscal year but some are still being worked upon..I was able to put in a where clause to only display projects whose close dates either have null value ( projects which are still being worked) and where the close dates are >= 1/1/2013. My Dashboard needs to have the below fields

Project Type, Count of Projects, Count of Closed Projects, Average days to complete, Count of Active Projects & Average Active days

I was able to get it correct except the last field Average Active days as it is displaying Average no's even against the project type which doesn't have any active projects or where the active project count is zero.

SELECT TblWO.[Operational* Categorization Tier 2], Count([TblWO]![Operational* Categorization Tier 2]) AS [Count], Avg([TblWO]![SLA in Days]) AS [Internal SLO in Days], Count([TblWO]![Closedate]) AS [No Closed Projects], Round(Avg([TblWO]![Closedate]-[TblWO]![Work Order Submit Date Time]),2) AS [Avg Close Days], [Count]-[No Closed Projects] AS [No Active Projects], Round(Avg(Date()-[TblWO]![Work Order Submit Date Time]),2) AS [Active Avg Days]
FROM TblWO
WHERE ((([TblWO]![Closedate]) Is Null Or ([TblWO]![Closedate])>=#10/1/2012#) AND (([TblWO]![Status])<>"Cancelled" And ([TblWO]![Status])<>"Rejected"))
GROUP BY TblWO.[Operational* Categorization Tier 2]
HAVING (((TblWO.[Operational* Categorization Tier 2])<>" "));