Calculate the mean deviation from the median of the following data.
Wages per week $10 - 20$ $20 - 30$ $30 - 40$ $40 - 50$ $50 - 60$ $60 - 70$ $70 - 80$
No. of workers $4$ $6$ $10$ $20$ $10$ $6$ $4$

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Solution

$\begin{matrix} \Rightarrow M e a n (A) = a + l \times \frac{\sum f d^{1}}{Σ f} m e a q n (A) = 45 + 0 = 45 A n s . \end{matrix}$

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Class	$10 - 20$	$20 - 30$	$30 - 40$	$40 - 50$	$50 - 60$	$60 - 70$	$70 - 80$
Frequency	$2$	$3$	$8$	$14$	$8$	$3$	$2$

Marks	$10 - 20$	$20 - 30$	$30 - 40$	$40 - 50$	$50 - 60$	$60 - 70$	$70 - 80$
Frequency	$3$	$7$	$10$	$6$	$8$	$2$	$4$

Class	0 - 10	10 - 20	20 - 30	30 - 40	40 - 50	50 - 60	60 - 70	70 - 80
frequency	5	8	7	12	28	20	10	10

Employees salary	$0 - 10$	$10 - 20$	$20 - 30$	$30 - 40$	$40 - 50$	$50 - 60$	$60 - 70$	$70 - 80$
No. of employees	$10$	$12$	$18$	$8$	$9$	$5$	$6$	$4$

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Wages per week	$10 - 20$	$20 - 30$	$30 - 40$	$40 - 50$	$50 - 60$	$60 - 70$	$70 - 80$
No. of workers	$4$	$6$	$10$	$20$	$10$	$6$	$4$