Find the mode of the given data.
Class Frequency 0−52005−1025010−1522515−2030020−25275
Modal class is 15-20 since it is the class with highest frequency.
Now, f1 = 300, f0 = 225, f2 = 275, I = 15, h = 5
Mode=l+[f1−f02f1−f0−f2]×h
f1 represents the frequency of the modal class.
Also,
l= lower boundary of the modal class
h= size of the modal class interval
f0= frequency of the class preceding the modal class
f2= frequency of the class succeeding the modal class
Mode=15+[300−2252×300−225−275]×5
∴Mode=18.75