<p>This seems like a no-brainer.  I created the tag (i.e., <a href="https://stats.stackexchange.com/questions/tagged/poisson-distribution" class="post-tag" title="show questions tagged &#39;poisson-distribution&#39;" rel="tag">poisson-distribution</a>), made them synonyms, merged them (so that all threads that used to have <code>[poisson]</code> now have <code>[poisson-distribution]</code> instead, without bumping >1k threads to the main page), and deleted the old <code>[poisson]</code> tag.  </p>
