That sounds pretty high, no way liberal arts majors are averaging $50k. Most of them are working as baristas at Starbucks, did the surveyed employers include Starbucks or BestBuy? (I am not talking about corporate jobs either).
You should read this survey as: If (that is a big if) you can get a job at one of the surveyed the companies (usually well-paying prominent companies), you may average 50k. For the rest of you (more than half), there is no hope and you better be living with your parents while geek squading at BestBuy.