Answer:
E
Step-by-step explanation:
When you perform an experiment on a population, the majority of the time, you cannot use the entire population, so instead you use a sample of that population.
In this case, you mark 130 MendAliens out of an unknown population. After that you capture 90, and see that 20 are marked. You can use this to assume that for every 90 MendAliens, you marked 20, so if you calculate that as a percentage, you would get 22.22%.
This means that you marked approximately 22% of the population, when you marked those 130 MendAliens. Using basic math, we can work backwards to calculate the total population.
Percentage (%) = Sample / Total
Inserting the values we know...
22.22% = 130 / Total
Rearranging the formula, we get...
Total = 130 / 22.22%
Since we know 22.22% is actually equal to (22.22 / 100)= 0.2222
Total = 130 / 0.2222
Total = 585
