Q. Find the mean deviation about median for the following data:

Marks	Number of girls
0-10	6
10-20	8
20-30	14
30-40	16
40-50	4
50-60	2

Q. Find the mean deviation about the median for the data

$x_i$	5	7	9	10	12	15
$f_i$	8	6	2	2	2	6

Q. Calculate the mean deviation about median age for the age distribution of $100$ persons given below :

Age	Number
16-20	5
21-25	6
26-30	12
31-35	14
36-40	26
41-45	12
46-50	16
51-55	9

Q. Find the mean deviation about the mean for the data:

Income per day	Numbers of persons
0-100	4
100-200	8
200-300	9
300-400	10
400-500	7
500-600	5
600-700	4
700-800	3

Q. Find the mean deviation about the median for the data
$36,72,46,42,60,45,53,46,51,49$

Q. Find the mean deviation about the mean for the data.

$x_i$	5	10	15	20	25
$f_i$	7	4	6	3	5

Q. Find the mean deviation about the mean for the data

Height of cms	Number of boys
95-105	9
105-115	13
115-125	26
125-135	30
135-145	12
145-155	10

Q. Find the mean deviation about the median for the data $13,17,16,14,11,13,10,16,11,18,12,17$.

Q. Find the mean deviation about the mean for the data
$38,70,48,40,42,55,63,46,54,44$

Q. Find the mean deviation about the mean for the data

$X_i$	10	30	50	70	90
$f_i$	4	24	28	16	8

Q. Find the mean deviation about the mean for the data
$4,7,8,9,10,12,13,17$

Q. Find the mean deviation about the median for the data

$X_i$	15	21	27	30	35
$f_i$	3	5	6	7	8

Q. Find the mean and variance for the data

$X_i$	92	93	97	98	102	104	109
$f_i$	3	2	3	2	6	3	3

Q. Find the mean and variance for the data

$X_i$	6	10	14	18	24	28	30
$f_i$	2	4	7	12	8	4	3

Q. Find the mean and variance for the following frequency distrubution

Classes	0-10	10-20	20-30	30-40	40-50
Frequencies	5	8	15	16	6

Q. Find the mean and variance for the first $10$ multiples of $3$

Q. Find the mean and standard deviation using short-cut method

$X_i$	60	61	62	63	64	65	66	67	68
$f_i$	2	1	12	29	25	12	10	4	5

Q. Find the mean and variance for the data $6,7,10,12,13,4,8,12$

Q. Find the mean and variance for the first $n$ natural numbers

Q. Find the mean and variance for the following frequency distribution

Classes	0-30	30-60	60-90	90-120	120-150	150-180	180-210
Frequencies	2	3	5	10	3	5	2