the mean isn't a robust statistic. i don't think your inference is correct in this case. a single user can theoretically throw the mean off from the central te

the mean isn't a robust statistic. i don't think your inference is correct in this case. a single user can theoretically throw the mean off from the central tendency completely. i would imagine there are a few users that send a lot more text messages and calling more than most people, biasing the result. it would be more useful to talk about the median in this case, i think. http://en.wikipedia.org/wiki/Robust_statistics#Examples_of_robust_and_non-robust_statistics http://en.wikipedia.org/wiki/Robust_statistics#Examples_of_r...