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A essayer dans votre classe avec un système de retroprojection.
With this file, students must guess the number of balls of each color contained in that box? Of course you can change the number of each secretly. With TBI for projecting this file, each group can simulate future essays., To the class and explain his approach to find the count estimated by calculations. Then the discussion can embark on the number of possible tests reliability of the results. (Besides an interesting point: if the total number of balls is 40, the majority of student groups offering 40 tests for 50 balls, 50 tests, etc .......)
Try in your class with a system retroprojection.