class mark

noun Statistics.
the midpoint of a class interval.

1885–90, for an earlier sense Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
class mark
1.  statistics a value within a class interval, esp its midpoint or the nearest integral value, used to represent the interval for computational convenience
2.  library science Also called: class number a symbol on a book or other publication indicating its subject field, shelf position, etc

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