#mean_value__mean  an average of n numbers computed by adding some function of the numbers and dividing by some function of n
  supertype:  average__norm  a statistic describing the location of a distribution: "it set the norm for American homes"
  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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