Question

1. below is the information based on a swan population of 850 swans. births = 150, deaths = 200, immigration = 15, emigration = 25. based on the changes within a year, determine the swan population at the end of the year. (2 marks)

Explanation:

Step1: Identify the initial population

The initial swan population is 850.

Step2: Calculate the net change in population due to births and deaths

The number of births is 150 and the number of deaths is 200. The net change due to births - deaths is $150 - 200=- 50$.

Step3: Calculate the net change in population due to immigration and emigration

The number of immigrants is 15 and the number of emigrants is 25. The net change due to immigration - emigration is $15 - 25=-10$.

Step4: Calculate the total net - change in population

The total net - change in population is the sum of the changes from births/deaths and immigration/emigration, so $-50+( - 10)=-60$.

Step5: Calculate the final population

The final population is the initial population plus the total net - change, so $850+( - 60)=790$.

Answer:

790