Project C07 Page 5 of 6

Nine balls labeled 1-9 are placed into an urn. A ball is selected at random, its number is recorded, and it is replaced into the urn. How many balls must be drawn, on average, in order to obtain all nine numbers?

Design a simulation that, using the Research Randomizer, will help you estimate the answer to this question. Describe your simulation below, making sure that your entire description appears in the box.

• Carry out your simulation and, based on your results, estimate how many balls, on average, must be drawn to obtain all nine balls.

When you are satisfied with your results, print this page and continue with the next.