#!/usr/local/bin/python
# $Id: moments.python,v 1.4 2001/05/09 00:58:40 doug Exp $
# http://www.bagley.org/~doug/shootout/

import sys, string, math, operator

def main():
    sum = 0
    nums = []
    atof = string.atof

    nums = map(atof, sys.stdin.readlines())
    sum = reduce(operator.add, nums)

    n = len(nums)
    mean = sum/n
    average_deviation = 0
    standard_deviation = 0
    variance = 0
    skew = 0
    kurtosis = 0

    for num in nums:
        deviation = num - mean
        average_deviation += abs(deviation)
        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

    nums.sort()
    mid = n / 2

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

    print "n:                  %d" % n
    print "median:             %f" % median
    print "mean:               %f" % mean
    print "average_deviation:  %f" % average_deviation
    print "standard_deviation: %f" % standard_deviation
    print "variance:           %f" % variance
    print "skew:               %f" % skew
    print "kurtosis:           %f" % kurtosis

main()