gistfile1.rb

#!/usr/bin/env ruby
require 'rest-client'
require 'nokogiri'

addresses = (1..10).inject([]) do |addresses, page|
  $stderr.puts "fetching page #{page}"
  
  html = RestClient.get 'http://mcserverlist.net/lists/top', params: {page: page}
  doc = Nokogiri::HTML(html)
  addresses += doc.css('.ip-and-port').map {|node| node.text.strip }
  addresses
end

avg = addresses.inject(0) {|total, addr| total += addr.length } / addresses.length

puts avg