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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.
Open to the right. Like the sign for a subset, or a rounded version of the less than symbol, <.
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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.
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