how to calculate mode if two classes have same and highest frequency (bimodal) ?

However to calculate the mode of grouped data use the following formula

Mode = L + [ (F - F1) / { (F - F1) + (F - F2) } ] * h

where

L = Lower limit of the modal class

F = Frequency of the modal class

F1 = Frequency of the class immediately previous of modal class

F2 = Frequency of the class immediate next of modal class

h = Range of the modal class (higher limit - lower limit)

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