diff --git a/lang/en_utf8/help/grade/aggregationcoefextra.html b/lang/en_utf8/help/grade/aggregationcoefextra.html
index befad37ee52..cdb6d2d98cd 100644
--- a/lang/en_utf8/help/grade/aggregationcoefextra.html
+++ b/lang/en_utf8/help/grade/aggregationcoefextra.html
@@ -7,5 +7,5 @@
     <li>Item 3 is graded 0-100 and its "Extra credit" value is left at 0.0000</li>
     <li>All 3 items belong to Category 1, which has "Mean of grades (with extra credits)" as its aggregation strategy</li>
     <li>A student gets graded 20 on Item 1, 40 on Item 2 and 70 on Item 3</li>
-    <li>The student's total for Category 1 will be 50/100 since (20*2 + 40 + 70)/3 = 50</li>
+    <li>The student's total for Category 1 will be 95/100 since 20*2 + (40 + 70)/2 = 95</li>
 </ul>
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