Show weighted average in Reports 2.0

Currently when you are averaging items and doing a stack bar chart the total for each bar is summing the averages instead of averaging. AND ideally it would be nice to have that total for each bar to be a weighted average based on the count and averages. 
Here is a picture

Andrew, for May, we plan to add the ability to show sum, average or median any column for both flat reports and aggregated report via group by. This will only be available for tables though. This may help in scenarios where you need an average of averages (by the way this won't be weighted average) Post that we will look to extend to other visualizations and think about weighted average as well.