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  1. or download this
                               x1**2 + x2**2 + ... + xN**2
   population_stdev = sqrt(---------------------------)
                                       N

   xi = age_i - average_age
  2. or download this
                               x1**2 + x2**2 + ... + xN**2
       sample_stdev = sqrt(---------------------------)
                                     N - 1

   xi = age_i - average_age