diff -r 7e179ee91af0 Lib/statistics.py
--- a/Lib/statistics.py	Mon Mar 23 15:26:49 2015 +0200
+++ b/Lib/statistics.py	Sat May 02 21:49:05 2015 +0200
@@ -176,6 +176,10 @@
     total = Fraction()
     for d, n in sorted(partials.items()):
         total += Fraction(n, d)
+    if T is int or T is bool:
+        assert type(total.numerator) is int
+        assert total.denominator == 1
+        return total.numerator
     if issubclass(T, int):
         assert total.denominator == 1
         return T(total.numerator)