Bugfixes in math_utils.

diff --git a/math_utils.py b/math_utils.py
index dd26cb6f175dea80ae28181c9cf983115b37f323..64cd9fb65839503b72baf5d3f95adbeb5a441101 100644 (file)
--- a/math_utils.py
+++ b/math_utils.py
@@ -96,7 +96,7 @@ class NumericPopulation(object):
             variance += (n - mean) ** 2
         for n in self.highers:
             variance += (n - mean) ** 2
-        count = len(self.lowers) + len(self.highers) - 1
+        count = len(self.lowers) + len(self.highers)
         return math.sqrt(variance) / count
 
     def _create_sorted_copy_if_needed(self, count: int):
@@ -120,7 +120,8 @@ class NumericPopulation(object):
         self._create_sorted_copy_if_needed(count)
         assert self.sorted_copy
         index = round(count * (n / 100.0))
-        assert 0 <= index < count
+        index = max(0, index)
+        index = min(count - 1, index)
         return self.sorted_copy[index]