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Question

Find the mode of the following data: Class 0-20, 20-40, 40-60, 60-80, Frequency: 15, 6, 18, 10.

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Solution

Consider the following data. 0-20 15 20-40 6 40-60 18 60-80 10The mode is given by the formula, Mode=l+f1-f02f1-f0-f2×hHere l is the lower limit of modal class, f1 is frequency of modal class, f0 is frequency of class preceding the modal class and f2 is the frequency of class after the modal class.Here the highest frequency is 18 which lies in the interval 40-60.So the modal class is 40-60The other values are, l=40, f0=6, f1=18, f2=10, h=20So the required value of mode is given by, Mode=40+18-6218-6-10×20 =40+1236-16×20 =40+1220×20 =40+12 =52

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