In case of open end classes, mean can be calculated only if their class marks (Mid-Points) are determined. If such classes contain a large proportion of the values, then the mean may be subjected to substantial error.
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If, in a frequency distribution, the initial class interval is indeterminate at its beginning and/or the final class interval is indeterminate at its end, the distribution is said to possess "open ended" classes.
An open interval centered about the point estimate, .
There is more than one notation, but the open interval between a and b is often written (a,b) and the closed interval is written [a,b] where a and b are real numbers. Intervals may be half open or half closed as well such as [a,b) or (a,b]. For all real numbers, it is (-infinity,+infinity), bit use the infinity symbol instead (an 8 on its side).
open end class
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