Len Cleavlin has a classic example (albeit probably apocryphal) of the dangers of the arithmetic mean:

There’s an old joke that the Geography Department at the University of North Carolina would tell prospective majors the average salary of graduates with a bachelor’s degree in geography from UNC, without telling them that UNC alumnus and NBA star Michael Jordan received his bachelor’s in geography….

Ole Miss’ criminal justice department might consider employing this trick, as New Orleans Saint Deuce McAllister was a CJ major (though I’m damned if I know whether or not he actually graduated); even given the number of CJ majors who’ve matriculated, Deuce’s NFL salary would probably bump up the mean by a few grand.