Normal distribution

[pblischak]

The Zig standard library implements random sampling from a Normal(0,1). Here we want to allow for any mean and variance: Normal( $\mu$, $\sigma^2$ ).

• Implement
• Test
• Document

[pblischak]

Going to switch to using standard deviation ($\sigma$) instead of variance ($\sigma^2$) for the normal parameterization. That way, random deviates from a Normal( $\mu$, $\sigma$ ) can be generated as Normal(0, 1) * $\sigma$ + $\mu$

[pblischak]

#8 Has initial draft