The frequency distribution of the age of persons (in years) attending trekking camp is given below:
Age (in years) Number of persons
$15 - 19$ $16$
$20 - 24$ $60$
$25 - 29$ $50$
$30 - 34$ $30$
Find the class mark of the class $20 - 24$ .

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Solution

Classmark is the mid point of a given class interval
The mid-point of the class $20 - 24 = \frac{20 + 24}{2}$
$= \frac{44}{2} = 22$
Therefore class mark of the class $20 - 24$ is $22$ .

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Similar questions

(Age in years)	$15 - 19$	$20 - 24$	$25 - 29$	$30 - 34$	$35 - 39$	$40 - 44$
No. of persons	$10$	$60$	$50$	$30$	$5$	$5$

35

Age (years)	15−19	20−24	25−29	30−34	35−39	40−44
No. of Persons	4	20	38	24	10	4

Calculate the missing frequency from the following distribution, it being given that the median of the distribution is 24.

Age in years	0-10	10-20	20-30	30-40	40-50
No. of persons	5	25	?	18	7

Age (in years)	0−10	10−20	20−30	30−40	40−50
Number of persons	5	25	?	18	7

Age in years:	0−10	10−20	20−30	30−40	40−50
No. of persons:	5	25	?	18	7

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