#!/usr/bin/env ruby
#
# Copyright (c) 2008  Pekka Enberg
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

def std_dev(samples)
  Math.sqrt(variance(samples))
end

def variance(samples)
  mean = mean(samples)
  samples.inject(0.0) { |sum, x| sum + (x - mean) ** 2 } / (samples.size - 1)
end
    
def mean(samples)
  samples.inject(0.0) { |sum, x| sum + x } / samples.size
end

text = $stdin.read
lines = text.split("\n")
times = []
for line in lines do
  times.push line.to_f
end

min     = times.min
max     = times.max
mean    = mean(times)
std_dev = std_dev(times)

puts "min      max      mean     std_dev"
puts sprintf("%-8.2f %-8.2f %-8.2f %-8.2f", min, max, mean, std_dev)