Specify and use a numpy RNG

[andrewgait]

Resolves #15

Uses the current best practice of creating an RNG, and splits the calculation to make it clearer what is happening in terms of adding the noise to the original Gaussian bell curve.

[github-actions]

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⏱️ Updated at 2026-04-16 12:50:19 +0000

[Scottan]

LGTM- approved