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Figure This!

Quick Answer:

Based on the sample caught by the scientists, there are about 1275 fish in the pond.


Complete Solution:

To use the capture-recapture method to estimate a population, scientists assume the proportions of the sample of the marked fish to the total fish in the sample is the same as the marked fish to the total fish in the pond.

There were 20 marked out of 170 of the sample. There were 150 marked out of the total fish in the pond. Thus, the following relationship is approximately true. Substitute the information given in the Challenge, then solve the problem:

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