diff --git a/source/sec-Likelihood.ptx b/source/sec-Likelihood.ptx
index 473f052..992d949 100644
--- a/source/sec-Likelihood.ptx
+++ b/source/sec-Likelihood.ptx
@@ -388,7 +388,7 @@
 
       <answer>
         <p>
-          <m>5/27 \approx 0.227</m>.
+          <m>5/22 \approx 0.227</m>.
         </p>
       </answer>
     </exercise>