Answer :

For ungrouped frequency distribution -


Where, l = lower limit of modal class, f1 = frequency of modal class, f0 = frequency of class previous to modal class, f2 = frequency of class next to modal class, and h = width of modal class(h = 20 here).


And, modal class is the class with highest frequency(here = 40 - 60)




Mode = 47.2


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