1.

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)1516161715161817151717

Answer»
Age (X)Tally MarksFrequency (f)
15III3
16III3
17IIII4Modal Class
18I1
N = 11

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



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