Subtract without using number line:

(1) 40 from 50

(2) −20 from + 30

(3) −25 from −40

(4) +20 from −50

(5) +25 from −25

(6) −25 from + 25

(7) +40 − (−10) − (+20)

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Solution

(1)

(2)

(3)

(4)

(5)

(6)

(7)

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Find out mean deviation and coefficient of mean deviation, using arithmetic mean from the following data:

$\begin{matrix} Profit (Rs) & 0 - 10 & 10 - 20 & 20 - 30 & 30 - 40 & 40 - 50 Shops (Number) & 5 & 10 & 15 & 20 & 25 \end{matrix}$

Class:	$5 - 10$	$10 - 15$	$15 - 20$	$20 - 25$	$25 - 30$	$30 - 35$	$35 - 40$	$40 - 45$
Frequency:	$5$	$6$	$15$	$10$	$5$	$4$	$2$	$2$

Variable	0−10	10−20	20−30	30−40	40−50	50−60	60−70
Frequency	10	20	35	40	25	25	15

Marks	$0 - 10$	$10 - 20$	$20 - 30$	$30 - 40$	$40 - 50$	$50 - 60$
No. of students	$5$	$10$	$25$	$30$	$20$	$10$

Daily Wages (in ₹)	10−15	15−20	20−25	25−30	30−35
Number of Workers	40	70	60	80	60

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