(Continuous data)
First find the medal class :
Medal class = Size of highest frequency
Apply the formula:
Let X and f be size and no. of items
Medal class = 6 – 8 [It has highest frequency]
L = 6 ® Lower limit of medal class
f0 = 1 ® Frequency preceeding to model class
f1 = 15 ® Frequency of the model class
f2 = 10 ® Frequency succeeding to model class
i = 2 Width of the medal class [i.e., 8 minus 6] = 2
∴ Z = 11.2307 is the modal size of items.
