How to display average in an SSRS table?

I am using SSRS 2008 and one of my rows is supposed to return the average of a certain field. But currently it just displays all of the rows instead of one row with the average. How do I implement this?

Currently the stored proc for this RDL file returns all of the records. So I tried using the "Avg(<field value>)" fun开发者_运维百科ction in SSRS for the SSRS expression. And then I grouped this row on the <field value>. I removed filtering so it should average all rows now.

I'm guessing the cause is the grouping. Any ideas though?

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I think you need a totals row. Right-click on the group and then Add Totals Then you should be able to put your Avg(<field value>) in that cell.