Calculate the number of individuals added to a population of rats if its initial density is 20 and birth rate for a specified period of time is 0.3

The correct option is C 6
Ratio of the number of individuals born in a population in a given amount of time to the initial population is called birth rate. Birth rate is an important population attribute.

As per the data given in the question:

Initial number of rats in the population = 20
Birth rate = 0.3

The formula used to calculate the birth rate of a population is as follows

$\text{Birth Rate}=\frac{\text{Number of individuals got added(births)}}{\text{Initial population}}$

The number of individuals added (by births) to the population in the specified time
= Birth rate x Initial number of individuals present in the population
= 0.3 x 20 = 6

Hence, the number of individuals added (by births) to the population of rats is 6.