Counting Methods Lesson 11-5 Pg. # 426-428. CA Content Standards Statistics, Data Analysis, and Probability 3.1 ***: I represent all possible outcomes.

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Presentation transcript:

Counting Methods Lesson 11-5 Pg. #

CA Content Standards Statistics, Data Analysis, and Probability 3.1 ***: I represent all possible outcomes of compound events in an organized way and express the theoretical probability of each outcome. Statistics, Data Analysis, and Probability 3.3***: I represent probabilities as ratios and percentages between 0 and 100.

Vocabulary: TREE DIAGRAM A diagram used to organize outcomes of an experiment to make them easier to count.

Vocabulary: COUNTING PRINCIPLE If one choice can be made in m ways and a second choice can be made in n ways, then the two choices can be made together in m x n ways.

Objective Use a tree diagram or the counting principle to find the total number of outcomes for an event. Math Link: You can use what you know about making tables and tree diagrams to find all possible outcomes.

Example 1. The cooking club is having a sandwich fundraiser. A sandwich consists of one choice of bread and one choice of filling. How many different kinds of sandwiches can be made with the following ingredients? Bread: Pita, Tortilla Filling: Chicken, Beef, Vegetable

You can use a tree diagram… To represent the different kinds of sandwiches. Menu includes: pc, pb, pv, tc, tb, tv

Example 2. One of each type of sandwich is prepared. You choose one without looking. Find the probability of getting a beef sandwich. The menu includes 6 kinds of sandwiches: pc, pb, pv, tc, tb, tv 2 kinds of sandwiches have beef: pb, tb So… P(beef) = 2/6 = 1/3 = 33% The probability of getting a beef sandwich is about 33%.

Example 3. If there are three kinds of breads and four kinds of fillings at the fundraiser, how many different kinds of sandwiches can be made? Use the counting principle. PossiblePossibleKinds of BreadsFillings Sandwiches 3 x 4 = 12 Twelve different kinds of sandwiches could be made. If there are m possible outcomes for the first event and n possible outcomes for the second event, then there are m x n possible outcomes.

Moral of the Story Use tree diagrams to organize possible outcomes. Also, if there are m possible outcomes for the first event and n possible outcomes for the second event, then there are m x n total possible outcomes.