Why do Asian students generally get higher marks than Latinos? - Los Angeles Times

The reason humans have stereotypes is because they are generally right enough to be useful. (Or perceived to be right often enough to be useful.) Doesn't mean they are true and certainly not true in every case. 

But beneath stereotypes is another word: expectation. However, in this article, expectation takes on another meaning, that of creating an image of the present and future that leads to enhanced results.