The lower limit of the modal class of the following data is :
C. I.
0 - 10
10 - 20
20 - 30
30 - 40
40 - 50
Frequency
5
8
13
7
6

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Solution

The correct option is C 20
Modal is the class which has the highest frequency.
Therefore, the highest frequency is $13$ which occurs in the interval $20 - 30$
Lower limit of the class is the smallest value of the class.
Therefore, the lower limit of the class $20 - 30$ is $20$

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Age in years	0 - 10	10 - 20	20 - 30	30 - 40	40 - 50	50 - 60
Number of patients	16	13	6	11	27	18

Class	0-10	10-20	20-30	30-40	40-50
Frequency	$7$	$15$	$13$	$17$	$10$

Class Interval	Frequency
0 - 10 10 - 20 20 - 30 30 - 40 40 - 50	4 6 10 16 14

x	5-10	10-20	20-30	30-40	40-50	50-60
f	4	8	12	16	9	5

Class Interval	0-10	10-20	20-30	30-40	40-50
Frequency	12	16	6	7	9

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