programdemos/stats.xtl
Using a library: Stats is a standard library, built into xetal (lib/Stats.xtl). The alias "s:" is this file's name for it: its exported names are used as s:m_ean and so on.
Run it with ./demos/stats.xtl or "xetal run demos/stats.xtl". It prints the mean, variance, standard deviation and range of v, then a mean of Floats; the expected values are in the comments.