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Question

Find the mode of the given data.

Class Frequency 05200510250101522515203002025275


A
18.25
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B
18.5
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C
18.75
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D
19.75
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Solution

The correct option is C 18.75

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+[f1f02f1f0f2]×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+[3002252×300225275]×5

Mode=18.75


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