In the data given below, the number of data values in the interval $25 - 30, 35 - 40 and 50 - 55$ are , , , respectively.

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Solution

The grouped frequency table for the given data can be denoted as

From the above grouped frequency table, it is clear that the number of data values in the interval $25 - 30$ is $4$ , the number of data values in the $35 - 40$ is $1$ and the number of data values in the interval $50 - 55$ is $4$ .

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800

Wages ( in hundreds)	$20 - 25$	$25 - 30$	$30 - 35$	$35 - 40$	$40 - 45$	$45 - 50$	$50 - 55$	$55 - 60$
No. of persons	$50$	$70$	$100$	$180$	$150$	$120$	$70$	$60$

Age in years	$25 - 30$	$30 - 35$	$35 - 40$	$40 - 45$	$45 - 50$	$50 - 55$	$55 - 60$
Number of employees	$4$	$16$	$19$	$28$	$22$	$8$	$3$

Age	20−25	25−30	30−35	35−40	40−45	45−50	50−55	55−60
Number of Students	50	70	100	180	150	120	70	60

The Age groups of workers are given in the table :

$\begin{matrix} Age & No. of workers 25 - 30 & 30 30 - 35 & 28 35 - 40 & 22 40 - 45 & 30 45 - 50 & 35 50 - 55 & 24 \end{matrix}$

Find the Median from the given data.

Class Interval	20−25	25−30	30−35	35−40	40−45	45−50	50−55
Frequency	10	12	8	20	11	4	5

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