I figured out the data bars as well. THe problem I get when running comparing the records is "Cannot have aggregate function in expression (Min(Count(())) so perhaps I need to build a new query?
Count counts up the total in a set. Min would return the minimum from a set.
It does look like you would need two queries, first to return you COUNT, then a second to return the minimum from your set.
I am guessing you are trying to count the total number of records that meet a criteria then work out your minimum and maximum values, correct?