Three students go apple-picking. Eddie picks $30$ apples, Avril picks $27$ apples, and Mike picks $33$ apples. How many apples does each of them pick on average? 
Overseas Competition->Knowledge Point->Counting Modules->Statistics and Probability
They pick $30+27+33=90$ apples in total. Therefore, on average, each of them picks $90\div3=30$ apples. 