How can you get the mode of a grouped data if there are two classes that both have the highest frequency?

If there are more than one class intervals which have the same frequency (equally qualifying to be the mode class) then both of the classes will be the mode class. this is called 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)

this is what i found out after reading books and understanding them. Please correct me if i am wrong.

Thanks,

Salman Ahmad