Is it possible to calculate the mean rate of a parent rule from its children?
This is not currently possible in Synchro, but you can do the following:
select all Rules
right click>Copy as text
paste into excel
do the desired calculation in excel to populate the Rate column for parent rules
select the values in the Rate column in Excel and copy
in Synchro, left click in the top cell of the Rate column and select Paste as Text to fill in the values