ariance xs)

Get the variance from the `xs`.</pre></div><hr><div class="binding"><span id="math/z-score" class="binding-sym">math/z-score</span> <span class="binding-type">function</span> <span class="binding-type"><a href="https://github.com/janet-lang/spork/blob/7fd743ac09e857fe0ebd333bd7a56cd0df3876c3//spork/math.janet#L311">source</a></span> <pre class="binding-text">(z-score x m d)

Gets the standard score for number `x` from mean `m`
and standard deviation `d`.</pre></div><hr><div class="binding"><spa