Highly recommend trying out any online courses (Coursera, Udacity, edX) and putting that on your application. I'm certain the Admissions committee is more concerned with whether you will be successful in the program than what your background is. So it's a matter of willingness to learn and preparation. In fact, the application asks you specifically what you are doing to prepare for the program. Try to answer that honestly before doing it.

Definitely check out the Google+ community here [1]. It's a fantasically active community. Great responses from students in the program. It is even frequented by Prof. Charles Isbell who is Associate Dean.

[1] https://plus.google.com/u/1/communities/10890255460754763472...