Page 31 - Health, Population and Environment Education 10

d. Dependency Ratio (DR)
The total population is broadly classified into three major age group as (0–14) years
children, (15–59) years and 60 years and above old people. Children of (0–14) years and
old people of 60 years and above are dependent population or economically inactive
population. Similarly, people of age group 15 to 59 years are independent population
or economically active population. The independent population needs to take care of
dependent population. We can calculate the dependency ratio to show relation between
dependent and independent population.
Dependency ratio can be defined as total number of dependent population in 100
independent population.

Mathematically,
Total number of dependent population
D.R. = × 100
Total number of independent population
or
Total number of (0 – 14) year + 60 years and above population
D.R. = × 100
Total number of (15 – 59) years population
It is expressed in percentage.

Activity: 4

In a country in 2011 A.D., there were 8859234 children below 15 years, 2261532 old
people of 60 years and above and 14015792 people of (15 – 59) years. Calculate the
dependency ratio of that country. Ans: 79. 34%

e. Sex Ratio (SR)
Sex ratio can be defined as total number of males in 100 females.
Mathematically,
Total number of males
Sex Ratio (S.R.) = × 100
Total number of females
It is also expressed in percentage (%).
Sex ratio helps to know the total number of males and females as well as number of males
in 100 females.

Worked out example: 15
If the male population of a place was 22563921 and female population 22587902, find out
the sex ratio of that place.
Solution:
Given,
In a place,
Male population = 22563921
GREEN Health, Population and Environment Education Book-10 31