Average Number Of Contact Hours Per Student

I am trying to find out the the Average number of contact hours per student. in Reporting Services 2005. The contact hours is the in the Totaltime field

Is this formula correct

=Sum(Fields!TotalTime.Value)/Avg(Fields!TotalTime.Value) is in the =Fields!StateServices.Value Group

My groups are

=Fields!Student_ID.Value
=Fields!StateCategory.Value
=Fields!StateServices.Value

Code:

SELECT Student_ind.[Student ID], ParticipantActivity.ActivityDate, School_tbl.[Studentschool Id], School_tbl.schoolID, ParticipantActivity.TotalTime,
ParticipantActivity.Services, ParticipantActivity.Activity, Student_ind.SSID, ParticipantActivity.StateCategory, ParticipantActivity.StateServices
FROM ParticipantActivity INNER JOIN
School_tbl INNER JOIN
Student_ind ON School_tbl.[Student ID] = Student_ind.[Student ID] ON ParticipantActivity.[Student ID] = Student_ind.[Student ID]

[code]....