Normal Random 0 .. 100

#!/usr/bin/ruby
# coding: utf-8
def normalrandom1
  12.times.map{ Random.rand }.inject(:+) - 6
end

@switch = true
@t = nil
@s = nil
def normalrandom2
  if @switch
    @switch = false
    @t = Math.sqrt(-2 * Math.log(1 - Random.rand))
    @u = 2 * Math::PI * Random.rand
    @t * Math.cos(@u)
  else
    @switch = true
    @t * Math.sin(@u)
  end
end

100.times do
  a = normalrandom1 * 50 / 2 + 50
  a = (a < 0) ?  0 : a
  a = (a > 100) ? 100 : a
  print "#{a.floor} "
end
puts
100.times do
  a = normalrandom2 * 50 / 2 + 50
  a = (a < 0) ?  0 : a
  a = (a > 100) ? 100 : a
  print "#{a.floor} "
end
puts