The demographic indicator calculated on the basis of data on age specific death rate in a given area over a period of time is called :
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Life Expectancy
Option (3) Life Expectancy — Correct. Life expectancy is the estimated number of years that an average person is expected to survive. It is calculated on the basis of data on age-specific death rates in a given area over a period of time.
NCERT (2025-26): “2.1 Some Theories and Concepts in Demography … The fertility rate refers to the number of live births per 1000 women in the child-bearing age group, usually taken to be 15 to 49 years.…” “…One concept which is somewhat complicated is that of life expectancy. This refers to the estimated number of years that an average person is expected to survive. It is calculated on the basis of data on age-specific death rates in a given area over a period of time.” “…The dependency ratio is a measure comparing the portion of a population which is composed of dependents (i.e., elderly people who are too old to work, and children who are too young to work) with the portion that is in the working age group, generally defined as 15 to 64 years. The dependency ratio is equal to the population below 15 or above 64, divided by population in the 15-64 age group. This is usually expressed as a percentage. A rising dependency ratio is a cause for worry in countries that are facing an ageing population, since it becomes difficult for a relatively smaller proportion of working-age people to carry the burden of providing for a relatively larger proportion of dependents. On the other hand, a falling dependency ratio can be a source of economic growth and prosperity due to the larger proportion of workers relative to non-workers. This is sometimes refered to as the ‘demographic dividend’, or benefit flowing from the changing age structure.…” |