Page 26 - Health, Population and Environment Education 10

b. Out - Migration Rate (Out MR)
The total number of out migrants in 1000 mid year population in a place in a year is called
as out migration rate.
Mathematically,
Total number of out migrants in a place in year
Out MR = × 1000
Mid year population of that place in the year
It is also expressed per 1000.

Worked out example: 10

The population of a village in 2013 A.D. was 2893. What would be out migration rate of
that village if 172 people out migrated from that city in that year?

Solution:

Given,
In a village in 2013 A.D.,
Number of out migrants = 172

Total population = 2893
Out Migration Rate (Out MR) = ?
We know,

Total number of out migrants in a place in a year
Out MR = × 1000
Mid year population of that place in the year
172
= × 1000
2893
= 59.45

∴ Out MR of that village in 2013 A.D was 59. 45 per 1000.
In the above example, Out MR is calculated as 59.45 per 1000. It means that nearly 59
people out migrated among 1000 mid year population in a place in a year.

c. Net Migration Rate (NMR)
The difference between number of in-migrants and out migrants in 1000 mid year
population in a place in a year is called as net migration rate.
Mathematically,
Number of in-migrants – Number of out migrants
NMR = × 1000
Mid year population of a place in a year
It is also expressed per 1000.

26 GREEN Health, Population and Environment Education Book-10