Susan is doubling her chocolate chip cookie recipe - if one batch calls for 3/4 cups of flour, how much will she need in total? Flip a coin 20 times and record the result after each round - how many times did the coin land on heads and how many times did the coin land on tails? What is probability and how do we calculate it? Why are fractions one of the best ways to represent probability?

Robert has three different shirts (red, green, and blue) and two different pairs of pants (black and blue) - use a tree diagram to model the different combinations. What is the probability that Robert will wear a green shirt with blue pants? Robert must now pick between his white, red, and black shoes - what is the probability he will wear black pants with black shoes? Why didn't the empirical probabilities you found for Tom's outfits for the month match the theoretical probabilities exactly? How can we find empirical results much closer to the theoretical probabilities?