Your class can use the capture–recapture method described in the previous exercise to estimate the number of goldfish in a bag of Cheddar Goldfish. Pour the Cheddar Goldfish into a paper bag, which represents the pond. Sample 10 of them. For this initial sample, use Pretzel Goldfish to replace them, to represent the tagged fish. Then select a second sample and derive an estimate for N, the number of Cheddar Goldfish in the original bag. See how close your estimate comes to the actual number of fish in the bag. (Your teacher will count the population of Cheddar Goldfish in the bag before beginning the sampling.) If the estimate is not close, what could be responsible, and what would this reflect as difficulties in a real-life application such as sampling a wildlife population?