Statistics Template fixes to remove Try-It solutions, fixes for example fonts and page breaking

<p>The following fixes were made for the Statistics template</p>
<ul>
<li>Request to remove inverted solutions for Try-It feature</li>
<li>For Examples, W&N wishes for Serif font to be used for problems, exercises and solutions</li>
<li>Page break inside rules removed from features and examples to allow Try-It, Examples and others to span across pages</li>
</ul>