diff options
| -rw-r--r-- | Lib/statistics.py | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/Lib/statistics.py b/Lib/statistics.py index 9f1efa21b1..ff19ce9672 100644 --- a/Lib/statistics.py +++ b/Lib/statistics.py @@ -920,9 +920,8 @@ def stdev(data, xbar=None): raise StatisticsError('stdev requires at least two data points') T, ss = _ss(data, xbar) mss = ss / (n - 1) - if hasattr(T, 'sqrt'): - var = _convert(mss, T) - return var.sqrt() + if issubclass(T, Decimal): + return _decimal_sqrt_of_frac(mss.numerator, mss.denominator) return _float_sqrt_of_frac(mss.numerator, mss.denominator) |