Question

There were 18 parrots in a garden last year, 8 new parrots were added to the population this year through reproduction, taking the population to 26. Calculate the birth rate of the population for the specified time period.

• A. 0.3
• B. 0.4
• C. 0.6
• D. 0.8

Answer 1

The correct option is B 0.4

Birth rate can be defined as the ratio between the number of individuals added (by birth) in an existing population and the initial population size, in a given time period.

As per the data given in the question,

Initial number of parrots in the population (previous year) = 18
Number of parrots added to the population (current year) = 8

The following formula can be used to calculate the birth rate of a population.

$\text{Birth Rate}=\frac{\text{Number of individuals added (by birth)}}{\text{Initial population size}}$

Birth rate = 8/18
= 0.4
Therefore, the correct answer is 0.4 offspring per parrot per year.