stats = DescriptiveStatistics::Stats.new([1,1,2,3,10])
stats.mean #=> 3.4
stats.median #=> 2
stats.mode #=> 1

stats = DescriptiveStatistics::Stats.new([1,1,2,3,10])
stats.range #=> 9
stats.min #=> 1
stats.max #=> 10
stats.percentile_from_value(10) #=> 80
stats.value_from_percentile(60) #=> 3

stats = DescriptiveStatistics::Stats.new([1,1,2,3,10])
stats.variance #=> 14.299999999999999
stats.population_variance  #=> 11.44
stats.standard_deviation #=> 3.7815340802378072
stats.relative_standard_deviation #=> 99.47961485463391

stats = DescriptiveStatistics::Stats.new([1,1,2,3,10])
stats.skewness #=> 1.188328915820243
stats.kurtosis #=> 2.405613966453127

require 'descriptive-statistics'
module Enumerable
  include DescriptiveStatistics
  # Warning: hacky evil meta programming. Required because classes that have already included
  # Enumerable will not otherwise inherit the statistics methods.
  DescriptiveStatistics.instance_methods.each do |m|
    define_method(m, DescriptiveStatistics.instance_method(m))
  end
end

[1,1,2,3,10].mean #=> 3.4