I would point out that the question is "what TP measurements were observed, and if the investigation needs this information, what is the range of those values".
I would say that while it may be interesting as to what the mean (average) of the measurements which provides some information as to the TP that is typical for that firearm, isn't the more important question as to what is the range of values; most importantly for the investigation, the lowest observed trigger pull measurement?
For that reason I would report the range of TP measurements.
/R.