I'm working on rdlc file getting values from stored procedure from that i have created dataset to show all values on rdlc file.
Need to show AVG of column value at end
rdlc filehow to do this?
I tried with AVG aggregate function using expression but problem is how to group by my column ?
guide me.

Try:
=sum(Fields!Time.Value)/CountDistinct(Fields!groupingField.Value), whereFields!Time.Valueis your field with time values andFields!groupingField.Valueis your field that you use for row grouping.