diff --git a/05-Multivariate-Gaussians.ipynb b/05-Multivariate-Gaussians.ipynb
index a0c11d3..d070d5a 100644
--- a/05-Multivariate-Gaussians.ipynb
+++ b/05-Multivariate-Gaussians.ipynb
@@ -448,8 +448,8 @@
     "$$\\begin{aligned}\n",
     "\\sigma_{H,W} &= \\mathbb E\\big[(H-\\mu_H)(W-\\mu_W)\\big] \\\\\n",
     "&= \\frac{1}{N}\\sum_{i=1}^n (H_i-\\mu_H)(W_i-\\mu_W) \\\\\n",
-    "&= (1.8-1.8)(70.1-73.5) + (2-1.8)(91.2-73.5) + (1.7-1.8)(59.5-73.5)\\, +\\\\\n",
-    "&\\, \\, \\, \\,  \\, (1.9-1.8)(93.2-73.5) + (1.6-1.8)(53.5-73.5) \\\\\n",
+    "&= \\frac{1}{5}[(1.8-1.8)(70.1-73.5) + (2-1.8)(91.2-73.5) + (1.7-1.8)(59.5-73.5)\\, +\\\\\n",
+    "&\\, \\, \\, \\,  \\, (1.9-1.8)(93.2-73.5) + (1.6-1.8)(53.5-73.5)] \\\\\n",
     "&= 2.18\n",
     "\\end{aligned}$$\n",
     "\n",