I would try to post it here and see if someone responds.

You could also try in the main khan academy site, there are users who watch the questions for certain topics because they find it fun to help others learn. To find all the questions being asked about a topic, click on the menu at the top of the KA site and pick a subject such as Statistics and Probability. If you scroll all the way to the bottom there is a link to community questions. If anyone asks a question on the articles and videos in the topic, they appear there. So if you pick an article/video, even if its only loosly related to your question, someone will find it and get back to you.
Here is the link to the statistics and probability related questions www.khanacademy.org/math/statistics-probability/d

Otherwise outside Khan Academy, you could try places like quora or stack exchange where people answer other people's questions. Those are two places I can think of off the top of my head, there are probably others.