1. A jar contains 100 marbles total. Some are black. If you pull 4 marbles out and 1 is black, how many out of the 100 marbles would you guess are black?



  1. Suppose a scientist tags 100 fish, and releases them. (Set the Tagged fish in pond to 100 to show this.) Later, a fisherman catches 50 fish from the same pond. (Set Fish to catchto 50 to show this.) The fisherman’s catch is a sample of all fish in the pond.


  1. Set the Tagged fish in pond to 50. Click New pond.

 

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