Is user group 2 registered members, Bryan?
To see it in a manual way, go to your admin CP / Statistics & Logs / Statistics / Registration Statistics and highlight and copy (CTRL+C) the contents of the table (all 3 columns - date, graphic bar and number) into memory.
Then open word and paste in there.
Highlight and delete the first two columns leaving the table of numbers.
Then in Word do a convert table to text. Doesn't matter what seperator is specified.
Then copy the lot and paste into an Excel spreadsheet.
Sum the numbers (highlight from the top number all the way down to the empty cell below the bottom number and click the sum button).
Then in calculator, enter the total and divide by the number of rows (it'll be 30 or 31).
And that's your average number of new registrations in total over the last 30 or 31 days.
The manual method is long winded and doesn't excluded non-activated registrations, but it's a way to get the numbers wthout hacking.
The hack is a lot easier in the long run