AS a middle school teacher of a school with only 10% low socio-economic students, you definitely see the gaps in computer knowledge with these students. Even though they get exposure during their k-12schooling, it is not enough to prepare them for the online education experience.
http://campustechnology.com/articles/2013/10/23/faculty-coalition-online-courses-leading-to-sub-prime-education.aspx?=CTCC