diff --git a/education/statistics/Sampling.md b/education/statistics/Sampling.md
index ee536a8..7de8bc9 100644
--- a/education/statistics/Sampling.md
+++ b/education/statistics/Sampling.md
@@ -42,4 +42,5 @@ To determine by how much the standard error is affected, if `n` is the sample si
 
 Accuracy in statistics refers to how small the standard error is. A smaller standard error means your data is more accurate.
 
-$$ \sqrt{\frac{(\% of 1)(\% of 0)}{}}}
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+You can use the below equation to find the percentage standard error of a box model that has ones and zeros. the % of ones and zeros should be represented as a proportion (EG: `60% = 0.6`).
+$$ \sqrt{\frac{(\% of 1)(\% of 0)}{num_{draws}}} $$
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