Mark Number
$20 - 29$ $1$
$30 - 39$ $1$
$40 - 49$ $10$
$50 - 59$ $11$
$60 - 69$ $5$
$70 - 79$ $2$
Find the interval that contains the median.

20 - 29

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30 - 39

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40 - 49

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50 - 59

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Solution

The correct option is C $50 - 59$
Add the total number of frequency, $n = 1 + 1 + 10 + 11 + 5 + 2 = 30$
The median is the middle number.
So, $\frac{n}{2} = \frac{30}{2} = 15$
$50 - 59$ is the interval that contain the median.

Suggest Corrections

Class-intervals	10−29	30−39	40−49	50−59	59−60	60−69
Frequencies	12	19	20	21	15	13

$C I$	$10 - 19$	$20 - 29$	$30 - 39$	$40 - 49$	$50 - 59$	$60 - 69$	$70 - 79$	$80 - 90$
$f$	$3$	$7$	$5$	$11$	$6$	$8$	$4$	$5$

Age group	$0 - 9$	$10 - 19$	$20 - 29$	$30 - 39$	$40 - 49$	$50 - 59$	$60 - 69$
No. of persons	$4$	$6$	$10$	$11$	$12$	$6$	$1$