diff --git a/Notebooks/Chap17/17_3_Importance_Sampling.ipynb b/Notebooks/Chap17/17_3_Importance_Sampling.ipynb
index 8f31414..92caf63 100644
--- a/Notebooks/Chap17/17_3_Importance_Sampling.ipynb
+++ b/Notebooks/Chap17/17_3_Importance_Sampling.ipynb
@@ -61,7 +61,7 @@
         "by drawing $I$ samples $y_i$ and using the formula:\n",
         "\n",
         "\\begin{equation}\n",
-        "\\mathbb{E}_{y}\\Bigl[\\exp\\bigl[- (y-1)^4\\bigr]\\Bigr] \\approx \\frac{1}{I} \\sum_{i=1}^I \\exp\\bigl[-(y-1)^4 \\bigr]\n",
+        "\\mathbb{E}_{y}\\Bigl[\\exp\\bigl[- (y-1)^4\\bigr]\\Bigr] \\approx \\frac{1}{I} \\sum_{i=1}^I \\exp\\bigl[-(y_i-1)^4 \\bigr]\n",
         "\\end{equation}"
       ]
     },