5.4, due on October 26

Reflective: There are a lot of propositions and theorems in this section that will take some time for me to wrap my head around -- the ones on the Law of the Unconscious Statistician and on variance in particular. This was definitely a harder section.

Difficult: The idea of thinking of a random variable as a function is a new concept to me. Does that make the term "random variable" a misnomer? Is it a variable or a function?

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