I agree completely, this is a real pain when presenting reports with
obviosuly incorrect data. When this is implemented, however, it should
not be an average of averages. This would also be incorrect information.
It should instead recalculate the total based on all available data, and
then come up with the real number. For example, If we're talking about
bounce rate, it shouldn't provide an average of bounce rate, it should
tally alll the data for the rows in the chart and re-calculate the total...