Biologists want to know how many fish are in a certain lake. On January 1, they removed 730 fish from the lake and tagged them. On February 1, they returned to the lake and collected a random sample of 380 fish, of which 40 had been previously tagged. How many fish does the lake have, based on this experiment?

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Intuitive way: by proportion Let x=population size. then x/730 = 380/40 solve for x=(380/40)*730 =6935 Can also be solved using a hypergeometric distribution using a maximum likelihood estimate.  Gives identical result in this case.

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