Question

a sample of the personnel files of 8 male employees revealed that during a 6 month period they lost the following number of days to illness: 2, 0,6,3,10,4,1,2. What is the mean devistion is days?

Answer 1

For calculation of Mean deviation ,

Employee A	No of days lost B	Deviation from mean C=B-M(mean or average)	absolute deviation Ignore signs (+or -)
1	2	2-28/8=-12/8	12/8
2	0	0-28/8=-28/8	28/8
3	6	6-28/8=20/8	20/8
4	3	3-28/8=-4/8	4/8
5	10	10-28/8=52/8	52/8
6	4	4-28/8=4/8	4/8
7	1	1-28/8=-20/8	20/8
8	2	2-28/8=-12/8	12/8
Total	28		152/8

Mean =28/8

Step-1

first need to calculate Mean (Average)=Sum of the lost days/Number of employees

=2+0+6+3+10+4+1+2/8

=28/8

step-2

calculate sum of absolute deviation =152

step-3

Mean deviation =sum of absolute deviation/No of date values (here No.of employees)

=152/8

=19 days

formula for mean deviation=

X=Data value

=Mean

N=Number of data values