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6 Nov 2019
A researcher wants to estimate the number of fish in a small pond. She throws a net in the water, and when she pulls it out, she finds 30 fish in the net. The researcher marks these 30 fish and throws them back in the pond, unharmed. The next day, the researcher uses her net to catch some fish again. This time she catches 40 fish and finds that 2 of the fish are marked (so these two fish are two of the fish she had caught on the previous day). Assuming that the fish mix freely in the pond, give the best in the pond based on the researcher's experiment. Explain how to solve this problem in two different ways, including at least one way that does not involve cross-multiplying. Show transcribed image text
A researcher wants to estimate the number of fish in a small pond. She throws a net in the water, and when she pulls it out, she finds 30 fish in the net. The researcher marks these 30 fish and throws them back in the pond, unharmed. The next day, the researcher uses her net to catch some fish again. This time she catches 40 fish and finds that 2 of the fish are marked (so these two fish are two of the fish she had caught on the previous day). Assuming that the fish mix freely in the pond, give the best in the pond based on the researcher's experiment. Explain how to solve this problem in two different ways, including at least one way that does not involve cross-multiplying.
Show transcribed image text Hubert KochLv2
15 Apr 2019