Robb, can I make a suggestion for exercises of this sort , that you title the thread "Homework: ranges " and try and get spenda or stax to lock the thread and temporarily sticky it,once you put the "homework " question up and give a couple of days for us noobs to do the analysis themselves and possibly pm the answers to you. You can then post the replies and attribute them to the senders once the deadline has passed.
Everyone then has to work through the theory themselves rather than cribbing ideas from other peoples answers. Then everyones answers could be critiqued to see where they went wrong , what they did right etc.