### Brenden's Scribe Post

Friday, October 10, 2008
Today in math we did a worksheet called Gumball machine. On the page there were 8 questions.

1. Imagine that a gumball machine contains 1 red, 2 green, 3 yellow, and 4 blue gumballs that thoroughly mixed before they were put into the machine which color do you think would come out? Explain your answer.

2. Suppose that after each gumball comes out, the gumball wizard magically puts another one of the same color into the machine so that the gumball machine always has the same number of each color of gumball. If you took 10 gumballs out of the magic machine, with the gum ball wizard replacing your gumball each time, how many times do you think each color would come out? Explain your answer.

3. Do the following experiment to simulate the gumball machine:

Draw the table below on a piece of paperPut 4 blue chips, 3 yellow chips, 2 green chips, and 1 red chip into a paper cup.

Mix the chips thoroughly.

Draw 1 chip out (without looking), tally its color in the middle row of your chart.

Repeat these steps until you have tallied 10 trials.

4. How close were your results to the predictions in question 2? Explain your answer.

5. Do the experiment 10 more times. Record your results on a chart like the on you used on number 3.
6. Combine the 2 sets of data from the 2 charts.

7. Use Blue, Yellow, Green, and Red to represent the four colors. On the scale below, show the experimental probability of drawing each color.

The next scribe is ...................... Alex Hobson.