"To beat the averages" means achieving better results or outcomes than what is considered typical or average. It implies surpassing the standard performance or expectations in a particular area. Full definition
This easily beats the average for multimedia laptops, which often have trouble lasting more than two hours at load and over five hours in the Reader's Test. (digitaltrends.com)
Only in this case would your 30 % compounding return beat the average return of the 50 - 50 asset allocation model. (freemoneyfinance.com)