Add examples to elucidate the formulas (GH-14898)
diff --git a/Doc/library/statistics.rst b/Doc/library/statistics.rst
index bc841fd..a906a59 100644
--- a/Doc/library/statistics.rst
+++ b/Doc/library/statistics.rst
@@ -527,14 +527,18 @@
The default *method* is "exclusive" and is used for data sampled from
a population that can have more extreme values than found in the
samples. The portion of the population falling below the *i-th* of
- *m* data points is computed as ``i / (m + 1)``.
+ *m* sorted data points is computed as ``i / (m + 1)``. Given nine
+ sample values, the method sorts them and assigns the following
+ percentiles: 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%.
Setting the *method* to "inclusive" is used for describing population
- data or for samples that include the extreme points. The minimum
- value in *dist* is treated as the 0th percentile and the maximum
- value is treated as the 100th percentile. The portion of the
- population falling below the *i-th* of *m* data points is computed as
- ``(i - 1) / (m - 1)``.
+ data or for samples that are known to include the most extreme values
+ from the population. The minimum value in *dist* is treated as the 0th
+ percentile and the maximum value is treated as the 100th percentile.
+ The portion of the population falling below the *i-th* of *m* sorted
+ data points is computed as ``(i - 1) / (m - 1)``. Given 11 sample
+ values, the method sorts them and assigns the following percentiles:
+ 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100%.
If *dist* is an instance of a class that defines an
:meth:`~inv_cdf` method, setting *method* has no effect.