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Question

Find out the mode value from the following data:
Mid-value 15 25 35 45 55 65 75 85
Frequency 5 8 12 16 28 15 3 2

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Solution

Mid Value Class Interval Frequency
(f)
15
25
35
45
55
65
75
85
10 − 20
20 − 30
30 − 40
40 − 50
50 − 60
60 − 70
70 − 80
80 − 90
5
8
12
16 f0
28 f1
15 f2
3
2


By inspection, we can say that the modal class is (50 – 60) as it has the highest frequency of 28.
Mode (Z)=l1+f1-f02f1-f0-f2×ior, Z =50+28-16228-16-15×10or, Z=50+1225×10or, Z=50+4.8= 54.8Hence, mode (Z) is 54.8.

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