Is it possible to have total and average summary in same report?
There are a couple of ways you could do it. You could have a second field. Use formulafill to fill it with a copy of the data in the first field, total one, and average the other.
Another way would be to total, assign the result to a variable, and then average, or the other way around. Put a text display object in your report form to display the value in the variable.