```#!/usr/local/bin/ruby
# -*- mode: ruby -*-
# \$Id: moments.ruby,v 1.5 2001/01/05 01:35:56 doug Exp \$
# http://www.bagley.org/~doug/shootout/

# throw away unused parameter sent by benchmark framework
ARGV.shift()

sum = 0.0
nums = []
num = nil
deviation = nil

num = Float(line)
nums << num
sum += num
}
n = nums.length()
mean = sum/n;
average_deviation = 0
standard_deviation = 0
variance = 0
skew = 0
kurtosis = 0

nums.each{|num|
deviation = num - mean
average_deviation += deviation.abs()
variance += deviation**2;
skew += deviation**3;
kurtosis += deviation**4
}
average_deviation /= n
variance /= (n - 1)
standard_deviation = Math.sqrt(variance)

if (variance > 0.0)
skew /= (n * variance * standard_deviation)
kurtosis = kurtosis/(n * variance * variance) - 3.0
end

nums.sort()
mid = n / 2

if (n % 2) == 0
median = (nums[mid] + nums[mid-1])/2
else
median = nums[mid]
end

printf("n:                  %d\n", n)
printf("median:             %f\n", median)
printf("mean:               %f\n", mean)
printf("average_deviation:  %f\n", average_deviation)
printf("standard_deviation: %f\n", standard_deviation)
printf("variance:           %f\n", variance)
printf("skew:               %f\n", skew)
printf("kurtosis:           %f\n", kurtosis)
```