The median class of the following distribution is ..............
x 5-10 10-20 20-30 30-40 40-50 50-60
f 4 8 12 16 9 5

20-30

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5-10

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50-60

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30-40

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Solution

The correct option is D 30-40
To find the median class:
First add the total number of frequencies.
Here, $f = 54$
$=$ $\frac{T o t a l n u m b e r o f f r e q u e n c y}{2}$
$=$ $\frac{54}{2} = 27$
Hence, the value 27 lies in the class interval 30-40 from the cummulative frequency table.

Suggest Corrections

Class-interval:	0−10	10−20	20−30	30−40	40−50	50−60	60−70
Frequency:	4	4	8	10	12	8	4

Marks	0 - 10	10 - 20	20 - 30	30 - 40	40 - 50	50 - 60
Number of students	8	7	13	12	30	25

Class interval:	0−10	10−20	20−30	30−40	40−50	50−60	Total
Frequency:	5	f₁	20	15	f₂	5	60

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