Counting Learning Outcomes
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1 1 Counting Learning Outcomes List all possible outcomes of an experiment or event. Use systematic listing. Use two-way tables. Use tree diagrams. Solve problems using the fundamental principle of counting.
2 2 List Outcomes When anything happens, we call it an event (or sometimes an experiment). The specific way the event ends is called the outcome of that event. The list of possible outcomes is called the sample space. e.g. rolling a die is an event. e.g. rolling a 4 on a die is an outcome. e.g. {1, 2, 3, 4, 5, 6} is the sample space of rolling a die.
3 3 List Outcomes Most of the time, we see multiple related events. e.g. picking a main course AND a dessert at a restaurant. e.g. choosing a car model AND a colour. e.g. rolling two dice. e.g. choosing which top, bottom, socks, AND shoes to wear. e.g. seeing a film AND buying a drink. We need ways to write the sample spaces for these kinds of events.
4 4 Use Systematic Listing To make sure you don t miss outcomes, it is best to list them in some logical way. Try writing the sample spaces of these events numerically or alphabetically: e.g. which suit is drawn from a standard deck of cards. e.g. which number is drawn from a standard deck of cards. e.g. which card is drawn from a standard deck of cards.
5 5 Use Systematic Listing If we have multiple events, try keeping all but one outcome the same and just changing that one outcome each time: e.g. if we have to choose between a red (R), blue (B) or green (G) top, and a yellow (Y), orange (O) or purple (P) bottom, list all the outfits that have a red top first, then all the outfits with a blue top, then all the outfits with a green top: R+Y R+O R+P B+Y B+O B+P G+Y G+O G+P
6 6 Use Systematic Listing List all the outcomes for a set menu if you must choose one starter (fruit salad, mozzarella sticks, or vegetable soup), one main course (steak, pasta, curry, or burger), and one dessert (ice cream or trifle).
7 7 Use Two-Way Tables If there are exactly two events, two-way tables work well for listing outcomes. Write the outcomes from one event in the first column and the outcomes from the other event in the first row. All the cells become the sample space for the combination: Yellow Orange Purple Red R+Y R+O R+P Blue B+Y B+O B+P Green G+Y G+O G+P
8 8 Use Two-Way Tables Write out the possible meals you can have with a set menu where you pick one starter (salad or soup) and one main course (steak, chicken, or vegetarian lasagne).
9 9 Use Tree Diagrams For multiple events, tree diagrams show all the outcomes easily. One event has branches for each outcome. Those outcomes have branches for each outcome of the second event. Those outcomes have branches for each outcome of the third event etc.
10 10 Use Tree Diagrams
11 11 Use Tree Diagrams A game is played using the two spinners shown below. The first spinner has three segments labelled 2, 4, and 6. The arrow has the same chance of stopping at each number. The second spinner has six segments labelled A, B, C, D, E, and F. The arrow has the same chance of stopping at each letter. Two possible outcomes are (2, A) and (6, D). Draw a tree diagram to show all the outcomes.
12 12 Use Tree Diagrams When you reach a traffic light, there are three colours it can be red (R), amber (A), or green(g). Draw a tree diagram to show the possible colours of two traffic lights as you first arrive at them.
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