Did you know that Harvard University has courses online in conjunction with MIT for free? Yes, they do! No degree is earned but these courses are perfect for people in a situation like mine, or a student who just needs extra help in a course and could use another perspective.
I am in the process of testing for my COHN, certification in occupational health nursing, next I need to take the COHN Safety Management, and later this year the Certified Safety Professional exams. All require a knowledge of statistics and calculus. I realized these three concepts are difficult ones and had no idea how I would teach myself what I needed to know. In a google search, I found the Harvard/MIT online program.
The free online classes can be found here at the Harvard Extension website.