I would have to say anything on KhanAcademy. Sal Khan just does an incredible job of explaining things. I particularly like his statistics course as a good primer into stats or if you need to quickly brush up on the subject
Seconded. Brought my linear algebra and probability theory up to scratch within a day. I don't know what it is about how he explains the material, but it just clicked for me first time, every time.
I would have to say anything on KhanAcademy. Sal Khan just does an incredible job of explaining things. I particularly like his statistics course as a good primer into stats or if you need to quickly brush up on the subject
https://www.khanacademy.org/math/probability/statistics-infe...