#mark.valuation__grade__score  a number or letter indicating quality (especially of a student's performance); "she made good marks in algebra"; "grade A milk"; "what was your score on your homework?"
  supertype:  #valuation__evaluation__rating  an appraisal of the value of something
  subtype:  #percentile__centile  (statistics) any of the 99 numbered points that divide an ordered set of scores into 100 parts each of which contains one-hundredth of the total
  subtype:  #decile  (statistics) any of nine points that divided a distribution of ranked scores into equal intervals where each interval contains one-tenth of the scores
  subtype:  #quartile  (statistics) any of three points that divide an ordered distribution into four parts each containing one quarter of the scores

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