Question

The growth rate for a population of 90 field mice in six months was 429%. If the number of births was 342, the number of deaths was 43, and there was no emigration, calculate the number of mice that migrated into the field.

a) 87.1

b) 102.3

c) 75.9

d) 92.5

Answer 1

The number of mice that migrated into the field can be calculated by finding the total population growth and subtracting the number of births and deaths.

Step-by-step explanation:

To calculate the number of mice that migrated into the field, we need to find the total population growth and subtract the number of births and deaths.

The growth rate of 429% means that the population increased by 429/100 * 90 = 386.1 mice in 6 months.

Subtracting the number of births (342) and deaths (43) from the total growth gives us the number of mice that migrated into the field: 386.1 - 342 - 43 = 1.1 mice. Therefore, the correct answer is a) 87.1 (rounded to one decimal place).