Statistics bugfixes for Final QA of text

For the Final QA of Statistics a few issues and broom up need to occur.  Some content changes are outstanding with Appendices and the duplication of so exercises in the book.  The following errors were fixes

1.
Contributor spacing in tables reduced by removing the padding in the td's of the overall table. This code was only there during the design of the book and is not needed.  Overall reduces space and tightens up the table visuals for book.  

2.
Chapter Objectives vanishing text is caused by the generic note (:not) affecting the manual ."note" called chapter objectives.  An override has to occur here because an !important has to be used in the generic note due to other selectors overriding it.  

3.
Bringing it together : Homework changed to Bringing It Together: Homework.  Space between colon asked to be removed.  also removed in Practice.

4.
Font in Solutions when Calculator is used in Example is rendering in Sans Serif.  Refactored the Example code a little to bring the Serif font to the top level of example to affect all pieces of example and then only affect the delta (titles, etc) that have to be Sans Serif.  This way we are sure to get everything serif as it needs to be and then only change what's needed to Sans-Serif.