Extensive improvements.

Many worked to explain random variables much better than before,
and otherwise streamlined the explanations so they support the
rest of the book better. Moved some material from the math chapter
in support of this.
This commit is contained in:
Roger Labbe 2015-11-21 12:43:51 -08:00
parent b0f84e0c16
commit 56bea69ea6

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