It is the class interval with most number of observations.
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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.
write an interval and a scale for the data set 55,30,78,98,7, and 45
They are both modal classes - the distribution is bi-modal.
The distribution is bimodal. That is all there is to it.