What is the death rate if there are 800 individuals alive at the beginning of the 1-year age interval and 200 individuals die during this interval?

0.25

The correct answer is Option (4)- 0.25

A population has certain attributes whereas, an individual organism does not. An individual may have births and deaths, but a population has birth rates and death rates. In a population, these rates refer to per capita births and deaths. The rates, hence, expressed are change in numbers (increase or decrease) with respect to members of the population. The death rate is calculated as the number of deaths divided by the initial population size.

The death rate can be calculated by dividing the number of individuals who died during a specific time interval by the total number of individuals alive at the beginning of that interval.

In this case, 200 individuals died during the 1 year age interval, and there were 800 individuals alive at the beginning of this interval. Therefore, the death rate can be calculated as:

Death rate = (Number of deaths / Number of individuals alive at the start) = (200 / 800) = 0.25