diff --git a/gptc/weighting.py b/gptc/weighting.py
index 5060e47..c83d02d 100755
--- a/gptc/weighting.py
+++ b/gptc/weighting.py
@@ -2,45 +2,10 @@
 
 import math
 from typing import Sequence, Union, Tuple, List
-
-
-def _mean(numbers: Sequence[float]) -> float:
-    """Calculate the mean of a group of numbers
-
-    Parameters
-    ----------
-    numbers : list of int or float
-        The numbers to calculate the mean of
-
-    Returns
-    -------
-    float
-        The mean of the numbers
-    """
-    return sum(numbers) / len(numbers)
-
-
-def _standard_deviation(numbers: Sequence[float]) -> float:
-    """Calculate the standard deviation of a group of numbers
-
-    Parameters
-    ----------
-    numbers : list of int or float
-        The numbers to calculate the mean of
-
-    Returns
-    -------
-    float
-        The standard deviation of the numbers
-
-    """
-    mean = _mean(numbers)
-    squared_deviations = [(mean - i) ** 2 for i in numbers]
-    return math.sqrt(_mean(squared_deviations))
+import statistics
 
 
 def weight(numbers: Sequence[float]) -> List[float]:
-    standard_deviation = _standard_deviation(numbers)
-    weight = standard_deviation * 2
+    weight = statistics.stdev(numbers) * 2
     weighted_numbers = [i * weight for i in numbers]
     return weighted_numbers