Or she knew that the term "average" can just as validly refer to the mode as the mean, and was bored by the whole exercise.
Geek behaviors present during conversations
http://www.stanford.edu/~pgbovine/geek-behaviors.htm
Social tips for geeks
Practice with public speaking and corporate politics and influencing are doing a lot to help me better understand how to befriend and relate to people that don't share my interests. It was initially surprising for me to be one of the geekier people in a building that is ostensibly full of IT workers.
Things that work for me: Toastmasters, Dale Carnegie books, Rands in Repose (blog and/or books), regional sports blogs.
To recap-- my brother said, literally, one sentence. I added one more sentence, relating the question to another field of study. Our friend was instantly, irremediably, and unabashedly bored.
From which I concluded that she took little pleasure in exploring any aspect of the statement she herself had introduced.
It might, instead, have had something do with the fact that the point you guys were trying to make was rather trivial.
What is the group supposed to do with that statement? Someone has to segue back to the original topic, while someone else just lost face. Most people will just either ignore the correction entirely, or just drop the topic altogether.