In the formula for mode of a grouped data,
mode =l+[t1−t02f1−f0−f2]×h,
where symbols have their usual meaning, f1 represents
Frequency of Modal class
The mode is the value that occurs the most often in a data set.
In the formula, mode =l+[t1−t02f1−f0−f2]×h,
f1 represents the frequency of the modal class.