In Which Course Do I Learn Greek Symbols for Statistics?

Hey folks. So, I never had much math in school at all. I am currently taking the high school statistics course here at Khan Academy to help me with statistics in university. However, in the lessons right now Greek symbols are being used constantly, but I have zero clue what they mean and what they are for. 

Does anyone know which course I should follow here at Khan Academy that introduces me to these Greek symbols?

Thanks!