Scientist randomly caught 10 fruit bats at an orchard and marked them with tags and then released them. Later on, they caught 30 fruit bats at the same location and 6 of them had tags. Assuming the population stays the same, how many fruit bats live there?
Ignoring sample variance, the mean should stay the same. So let P be the population
10/P=6/30 Same mean
so P=300/6=about 50