write an interval and a scale for the data set 55,30,78,98,7, and 45
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It is the class interval with most number of observations.
When observations are grouped into class intervals, the interval that contains the most frequently occurring value is known as the modal class.
You cannot have a preceding class to the first class. There is no zeroth class.
the modal group is the group with most data in.
They are both modal classes - the distribution is bi-modal.