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education/statistics/Probability.md
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@ -77,3 +77,5 @@ The *expected value*(EV) for the *sum* of all draws is $num_{draws}*ave_{box}$.
The *standard error* (SE) for the sum of all draws is $\sigma_{box} \sqrt{num_{draws}}$ The *standard error* (SE) for the sum of all draws is $\sigma_{box} \sqrt{num_{draws}}$
68% of the data will be within +- 1 SE of the EV. 68% of the data will be within +- 1 SE of the EV.
to find the % of data between two points, find $z_1$ and $z_2$, then $normalcdf(z_1, z_2)$ and multiply by 100%