Wow, here you are, and you are directly motivating me to also start learning something like that. There are very few work orders at the moment, so I wander around the house looking for something to do for myself. It seems to me that studying the theory of probability would be very interesting. By the way, I remembered that my nephew recently told me about a very interesting
precalculus online course . Now I went over and looked - this Academy offers a distance learning course in probability theory. So, good luck to you!