Statistics › Sampling and inference › Capture-recapture estimates
Estimating fish population by recapture
Middle school · ●○○○○ 10 pts
Management staff caught 30 fish from a pond, marked them, and released them back into the pond. 10 days later, they caught 50 fish from the pond, of which 2 were marked. Assume the marked fish have mixed evenly through the pond, so the proportion marked in the second catch estimates the proportion marked in the whole pond. Based on this data, estimate the total number of fish in the pond.