<p>I would say they are <strong>on-topic</strong>, but perhaps still likely to get closed here (either as <em>not a real question</em> or <em>duplicate</em>, depending on the circumstances), unless there is some additional context provided by the author.</p>

<p>The <a href="https://stats.stackexchange.com/questions/tagged/distributions">distributions</a> tag will bring up some examples. <a href="https://stats.stackexchange.com/search?q=[distributions]+%2Bfit+is%3Aquestion">This search</a> narrows things down a little more.</p>
