软件包：ruby-enumerable-statistics（2.0.7+dfsg-3 以及其他的）

Statistics features for Enumerable

Enumerable::Statistics provides some methods to calculate statistical summary in arrays and enumerables.

The following methods are supplied by this library:

 - `Array#mean`, `Enumerable#mean` - Calculates a mean of values in an array
   or an enumerable
 - `Array#variance`, `Enumerable#variance` - Calculates a variance of values
   in an array or an enumerable
 - `Array#stdev`, `Enumerable#stdev` - Calculates a standard deviation of
   values in an array or an enumerable
 - `Array#mean_variance`, `Enumerable#mean_variance` - Calculates a mean and a
   variance simultaneously
 - `Array#mean_stdev`, `Enumerable#mean_stdev` - Calculates a mean and a
   standard deviation simultaneously
 - `Array#median` - Calculates a median of values in an array
 - `Array#percentile(q)` - Calculates a percentile or percentiles of values
   in an array
 - `Array#value_counts`, `Enumerable#value_counts`, and `Hash#value_counts` -
   Count how many items for each value in the container
 - `Array#histogram` - Calculate histogram of the values in the array

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