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20 January, 15:57

In City Lake, researches caught, marked, and released 213 bass. Later, they took a sample of 104 bass and found that 13 were marked. Estimate the number of bass in the lake.

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  1. 20 January, 18:55
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    13 out of the 213 tagged returned

    13/213 is estimate of how many fraction returned

    proportional, marked/totalmarked≈caught/totalinlake

    213/13=total/104

    times both sides by 104*13 (cross multiply)

    213*104=total times 13

    22152=total times 13

    divide both sides by 13

    about 1704 bass in the lake
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