diff --git a/02-stats/random-variables.ipynb b/02-stats/random-variables.ipynb
index 3e3a154..c5cae05 100644
--- a/02-stats/random-variables.ipynb
+++ b/02-stats/random-variables.ipynb
@@ -232,7 +232,7 @@
                 "n_experiments = 100\n",
                 "probability = 0.5\n",
                 "\n",
-                "data = range(n_experiments)\n",
+                "data = range(n_experiments+1)\n",
                 "pmf = binom.pmf(data, n_experiments, probability)\n",
                 "\n",
                 "plt.figure(figsize = (10, 5))\n",