Respuesta :
The achievement gap is the United States refers to the observed, persistent disparity in measures of education performance among subgroups of u.s. students
Answer:
The correct answer is tha by achievment gap, Malcom Gladwell says that by adding the academic success of kids if different socio economic standars you could see the difference over the summers as the kids would accomplish somethings during it.
Explanation:
Gladwell wrote this in his 2008 book Outliers.