Because of rounding, the stated class limits do not correspond to the actual ranges of data falling in them. For example, if the class limits are 1.00 and 2.00, then all values between 0.95 and 2.05 would actually fall in the given class, so the class boundaries are 0.95 and 2.05 (Kenney and Keeping 1962, p. 17).
Class Boundaries
See also
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. 17, 1962.Referenced on Wolfram|Alpha
Class BoundariesCite this as:
Weisstein, Eric W. "Class Boundaries." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/ClassBoundaries.html