Fixed a typo.
Merge pull request #200 from insertinterestingnamehere/captions

Fixed a typo.
Updated and added some graphs.
Merge pull request #201 from insertinterestingnamehere/graphics

Updated and added some graphs.
Modified markov graph lab to reflect updated image.
Merge pull request #202 from insertinterestingnamehere/graphfix

Modified markov graph lab to reflect updated image.