Hi Anitha,
Its easy and simple, follow below steps:
1. Create a bar chart as usual.
![](https://www.edureka.co/community/?qa=blob&qa_blobid=2167853803886790024)
2. Add Grand totals from analytics pane.
![](https://www.edureka.co/community/?qa=blob&qa_blobid=1723977144915704951)
3. Now click on the grand total bar and click on automatic.
4. Select average in the drop down.
![](https://www.edureka.co/community/?qa=blob&qa_blobid=5193124440565202536)
5. Now a average column for the chart of all values is shown at the last column.
![](https://www.edureka.co/community/?qa=blob&qa_blobid=1593452609717098943)
6. Now edit the alias name for the column/bar to average or grand avg.
Hope this helps you.