@Do_EE trying to remain somewhat anonymous, but:
3.6 gpa undergrad from a top state university in the US (double major, both humanities with very little quant)
GRE: 165Q, 162V, 5.0AWA
Am several years out of undergrad, during which I did a grab bag of things including time abroad, a fellowship/grant, and a couple different jobs in the US (one related to politics, the other to healthcare). Worked to complete pre-reqs on my own including stats courses and linear algebra at a local community college and then just spent a bunch of time learning some programming languages on my own.
I honestly think writing a good essay got me most of the way there because I definitely don't have the strongest quant background: I just put in the time to catch up (doing the pre-reqs) and demonstrated I was willing to work hard and told them why I wanted to do the program. Hope that helps--best of luck to you!