Fix ave-time considering switch to micro seconds

extra/project-euler/ave-time/ave-time.factor

@@ -1,21 +1,24 @@
-! Copyright (c) 2007 Aaron Schaefer.
+! Copyright (c) 2007, 2008 Aaron Schaefer.
 ! See http://factorcode.org/license.txt for BSD license.
 USING: continuations fry io kernel make math math.functions math.parser
     math.statistics memory tools.time ;
 IN: project-euler.ave-time
 
+: nth-place ( x n -- y )
+    10 swap ^ [ * round >integer ] keep /f ;
+
 : collect-benchmarks ( quot n -- seq )
     [
         [ datastack ]
-        [ '[ _ gc benchmark , ] tuck '[ _ _ with-datastack drop ] ]
+        [
+            '[ _ gc benchmark 1000 / , ] tuck
+            '[ _ _ with-datastack drop ]
+        ]
         [ 1- ] tri* swap times call
     ] { } make ; inline
 
-: nth-place ( x n -- y )
-    10 swap ^ [ * round ] keep / ;
-
 : ave-time ( quot n -- )
     [ collect-benchmarks ] keep swap
-    [ std 2 nth-place ] [ mean round ] bi [
+    [ std 2 nth-place ] [ mean round >integer ] bi [
         # " ms ave run time - " % # " SD (" % # " trials)" %
     ] "" make print flush ; inline