diff --git a/ipynb/Probability.ipynb b/ipynb/Probability.ipynb
index 6f1f140..dca8619 100644
--- a/ipynb/Probability.ipynb
+++ b/ipynb/Probability.ipynb
@@ -2339,7 +2339,7 @@
     "def repeated_hist(dist, n=10**6, bins=100):\n",
     "    \"Sample the distribution n times and make a histogram of the results.\"\n",
     "    samples = [dist() for _ in range(n)]\n",
-    "    plt.hist(samples, bins=bins, normed=True)\n",
+    "    plt.hist(samples, bins=bins, density=True)\n",
     "    plt.title('{} (μ = {:.1f})'.format(dist.__name__, mean(samples)))\n",
     "    plt.grid(axis='x')\n",
     "    plt.yticks([], '')\n",