November 2019
Beginner
228 pages
2h 45m
English
Scientists must always keep track of the population of fish in order to monitor the impact on the fish life cycle from natural environmental changes. There is a type of fish called AA in a lake for research. The scientists set free a small group of labeled fish AA, whose total number equals to #(total_labeled), to the lake. After a period of time, they capture a number of fish AA randomly from the lake and use them as samples, whose total number equals to #(total_captured). Among these sample fish AA, they sort out the labeled fish AA, whose total number equals to #(labeled_among_captured).
