Find the mode of the following distribution :
Class-interval 0 - 20 20 - 40 40 - 60 60 - 80 80 - 100 100 - 120
Frequency 10 35 52 61 38 20

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Solution

Mode is the value that occurs most often in the data set.
Hence, the mode for the given distribution is the class interval $60 - 80$ .

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Marks	0 - 20	20 - 40	40 - 60	60 - 80	80 - 100
Frequency	5	10	20	10	15

Interval	0-20	20-40	40-60	60-80	80-100
Frequency	6	8	12	10	6

Class interval	0-10	10-20	20-30	30-40	40-50	50-60	60-70
Frequency	2	3	x	6	5	3	2

Life period (in hrs)	0-20	20-40	40-60	60-80	80-100	100-120
Frequency	100	35	52	61	38	29

Class:	0−20	20−40	40−60	60−80	80−100	100−120
Frequency:	5	f₁	10	f₂	7	9

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Class-interval	0 - 20	20 - 40	40 - 60	60 - 80	80 - 100	100 - 120
Frequency	10	35	52	61	38	20