diff --git a/11_midlevel_data.ipynb b/11_midlevel_data.ipynb
index 4302786..6520e93 100644
--- a/11_midlevel_data.ipynb
+++ b/11_midlevel_data.ipynb
@@ -370,7 +370,7 @@
     {
      "data": {
       "text/plain": [
-       "(3.0, 5.0, 2.0)"
+       "(3.0, -1.0, 2.0)"
       ]
      },
      "execution_count": null,