The average of the values of the class limits for a given class. A class mark is also called a midvalue or central value (Kenney and
Keeping 1962, p. 14), and is commonly denoted 
.
Class Mark
See also
Class Interval, Class LimitsExplore with Wolfram|Alpha
References
Kenney, J. F. and Keeping, E. S. Mathematics of Statistics, Pt. 1, 3rd ed. Princeton, NJ: Van Nostrand, p. 14, 1962.Referenced on Wolfram|Alpha
Class MarkCite this as:
Weisstein, Eric W. "Class Mark." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/ClassMark.html