A bag has 10 colored chips
in it. The colors are red, blue, green, and yellow. By drawing
a chips out of the bag and replacing them back into the back,
the number of yellow chips in the bag can be discovered. Use
this machine to simulate a bag of chips. Press the button to
draw a chip. You will need to make 20 to 50 trials to get the
correct probablity for the yellow chips.