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Question

Age of 11 students of class XI is given below. Find the modal age by: (i) Observation Method; (ii) Frequency distribution Method.
Age (in years) 15 16 16 17 15 16 18 17 15 17 17

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Solution

Age
(X)
Tally
Marks
Frequency
(f)
15
16

3
3
17 4 Modal Class
18 1
N=11

Since 17 occurs the highest number of times in the series i.e. 4 times.
Hence, Mode = 17

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