#average__norm  a statistic describing the location of a distribution: "it set the norm for American homes"
  supertype:  #statistic  a datum that can be represented numerically
  subtype:  #age_norm__agenorm  the average age at which particular performances are expected to appear
  subtype:  #modal_value__mode  the most frequent value of a random variable
  subtype:  #median_value__median  the value below which 50% of the cases fall
  subtype:  #mean_value__mean  an average of n numbers computed by adding some function of the numbers and dividing by some function of n
     subtype:  #arithmetic_mean__first_moment__firstmoment__expectation__expected_value  the sum of the values of a random variable divided by the number of values
     subtype:  #geometric_mean__geometricmean  the mean of n numbers expressed as the n-th root of their product
     subtype:  #harmonic_mean  the mean of n numbers expressed as the reciprocal of the arithmetic mean of the reciprocals of the numbers

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