Question

A biologist studied the population of rats in a barn. He found that in a year the number of rats increases to 250 from an initial population of 200. What is the birth rate for the given population?

• A. 0.20
• B. 0.50
• C. 0.25
• D. 1.25

Answer 1

The correct option is C 0.25

Birth rate is the ratio of the number of individuals born in a population in a given period of time to the initial total population.


$\mathrm{Birth}\mathrm{Rate}=\frac{50}{200}=0.25$

i.e. the birt rate is 0.25 offspring per rat per year