Mean Deviation from Mean for Continuous Series

Q.

A survey was conducted by a group of students as a part of their environment awareness program, in which they collected the following data regarding the number of plants in $20$ houses in a locality. Find the mean number of plants per house. Which method did you use for finding the mean, and why?

Number of Plants	0-2	2-4	4-6	6-8	8-10	10-12	12-14
Number of Houses	1	2	1	5	6	2	3

Q. Find the mean deviation from the mean for the following continuous frequency distribution.

Sales in Rs. thousand	40-50	50-60	60-70	70-80	80-90	90-100
Number of Companies	5	15	25	30	20	5

Q. Compute Mean deviation about median for the following Frequency distribution.

Variable($x$)	$10$	$15$	$20$	$25$	$30$	$35$	$40$	45
Frequency($f$)	$7$	$3$	$8$	$5$	$6$	$8$	$4$	9

1. $10.5$
2. $13.2$
3. $10.1$
4. $12.1$

Q. Find, to the nearest tenth, the mean absolute deviation for the set
$2,5,7,9,1,3,4,2,6,7,11,5,8,2,4$.

1. $2.3$
2. $1.3$
3. $2.4$
4. $1.4$