>> Does anybody here know enough about statistics to come up with answers?
>
> That's what standard deviation (σ) on my old casio FX-180P is made for.
The standard deviation tells you how variable something is. However:
1. This, by itself, does not tell you how many measurements you need to
take to achieve a given level of accuracy.
2. If you compute the SD from the data you gathered, then the SD itself
may be inaccurate.
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