Answer :



Mean


OR



Model class = 60-80


Lower limit of model class, l = 60


Frequency of model class, f1 = 12


Frequency of class preceding model class, f0 = 10


Frequency of class following model class, f �2 = 6


Height of model class, h = 10


We know,




= 60 + 0.4


= 60.4


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