diff --git a/07_RegressionModels/01_01_introduction/index.Rmd b/07_RegressionModels/01_01_introduction/index.Rmd
index 035969d30..f31959988 100644
--- a/07_RegressionModels/01_01_introduction/index.Rmd
+++ b/07_RegressionModels/01_01_introduction/index.Rmd
@@ -102,7 +102,7 @@ g
   * How could one describe the "middle"?
   * One definition, let $Y_i$ be the height of child $i$ for $i = 1, \ldots, n = 928$, then define the middle as the value of $\mu$
   that minimizes $$\sum_{i=1}^n (Y_i - \mu)^2$$
-* This is physical center of mass of the histrogram.
+* This is physical center of mass of the histogram.
 * You might have guessed that the answer $\mu = \bar Y$.