Suppose you want to know how many fish live in a lake. How can you count the fish population
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Use capture-recapture sampling method. My prof created this program for such cases and it's pretty cool. Throw a stick of dynamite into the lake and then count the corpses Find the average number of fish per unit of volume and then multiply by the size of the lake.

(2,20) means that the 2 is 2 hours and 20 is 20$. so there both 20$ for 2 hours only the same price. like it says. so, the dunk tank and the bounce house are the same price (20$) for the same amount of time (2 hours).

hope i