# 4.5 Finding Probability Using Tree Diagrams and Outcome Tables

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1 4.5 Finding Probability Using ree Diagrams and Outcome ables Games of chance often involve combinations of random events. hese might involve drawing one or more cards from a deck, rolling two dice, or tossing coins. ow do you find the probability that a particular sequence of these events will occur? his section will show you some strategies for listing the outcomes of an experiment in an organized way so that you can find the probability of a particular compound event. REE DIAGRAMS AND E MULIPLICAIVE PRINCIPLE FOR COUNING OUCOMES A tree diagram is often used to show how simple experiments can be combined one after the other to form more complex experiments. he successive branches of the tree each correspond to a step required to generate the possible outcomes of an experiment. he tree diagram and outcome table that correspond to tossing two coins appear below. ree Diagram Outcome able First Coin Second Coin eads Outcome Simple Coin 1 Coin 2 Event eads? hink about ree Diagrams ow would the tree diagram differ if the experiment consisted of rolling a die twice instead of tossing a coin twice? eads Consider an experiment in which you first roll a six-sided die and then toss a coin. What is the probability of tossing tails and rolling an even number? 4.5 FINDING PROBABILIY USING REE DIAGRAMS AND OUCOME ABLES 239

2 he following tree diagram can be used to represent the possible results. Die Roll Coin oss Outcome? hink about he Outcomes Why would writing the ordered pairs as (c, d) instead of (d, c) have no effect on the total number of outcomes? Does the result of the roll of the die have any influence on the result of tossing the coin? What would the tree diagram look like if the coin were tossed before the die is rolled? (1, ) (1, ) (2, ) (2, ) (3, ) (3, ) (4, ) (4, ) (5, ) (5, ) (6, ) (6, ) hink about? Representing the Outcomes Construct an outcome table for this experiment. Use it to find P(roll < 4, heads). ow does a Venn diagram represent the events in an experiment differently from a tree diagram? From an outcome table? For what kind of event is it more appropriate to use a Venn diagram or a tree diagram to represent the outcomes from an experiment? he sample space for this experiment consists of ordered pairs of the form (d, c), where d is the result of a roll of the die and c is the result of the toss of a coin. he tree diagram for the experiment clearly shows the 12 possible outcomes. For each roll of the die (the first entry in the ordered pair), we have a choice of six possible outcomes. For each of these, there are two choices for the coin toss (the second entry of the ordered pair). As a result, there are possible outcomes. here are three outcomes that correspond to the event of an even roll of the die followed by a toss of tails. hey are (2, ), (4, ), and (6, ). herefore, 3 P(even roll, tails) 1, or In this case, the event of getting an even roll of the die and the event of getting tails on a coin toss have no influence on each another. he following Venn diagram shows the relationship between the events. even even, tails S 240 CAPER 4 DEALING WI UNCERAINY AN INRODUCION O PROBABILIY

3 Multiplicative Principle for Counting Ordered Pairs, riplets, etc. A tree diagram is used to represent the outcomes of an experiment that are the result of a sequence of simpler experiments. Assume that an outcome for each experiment has no influence on the outcome of any other experiment. he total number of outcomes is the product of the possible outcomes at each step in the sequence. If a is selected from A and b is selected from B, n((a, b)) n(a) n(b). Project Connection he purpose of your project may be to determine whether or not some variable has a significant effect on another variable, or using the language of probability, you may want to know whether the variables are dependent or not. INDEPENDEN AND DEPENDEN EVENS In the die roll/coin toss experiment, P(even roll, tails) P(even roll) P(tails) What is the probability of tossing the coin and getting tails if you know in advance that the die will show an even number? he rolling of the die and the tossing of the coin are independent events. Knowing the outcome of the die roll has no effect on the probability of getting tails. Consider the conditional probability P(tails even). From the previous section, we know that P(tails even) n(even roll, tails) n(ordered pairs) n(even roll) n(tails) n(die rolls) n(coin tosses) n(even roll) n(die rolls) P(tails even) P(even) n(tails) n(coin tosses) 1 2 We also know that P(tails) 1. herefore, P(tails even) P(tails) FINDING PROBABILIY USING REE DIAGRAMS AND OUCOME ABLES 241

4 independent events events A and B are independent if the occurrence of one event does not change the probability of the occurrence of the other event Conditional Probability for Independent Events If A and B are independent events, then P(B A) P(B) If this is not the case, the events are dependent. Recall that the conditional probability of event B given event A has occurred is P(B A) If events A and B are independent, then P(B A) P(B). herefore, P(B) and P(B A) P(B) P(A). P(B A) P(A) P(B A) P(A) Multiplicative Principle for Probabilities of Independent Events If A and B are independent events, then P(A and B) P(A B) P(A) P(B) Example 1 he Even Odd Game he EvenOdd game is a game that can be played by two players using two coins. One of the players assumes the Even role; the other, Odd. Each player tosses a coin. If the two coins show an even number of heads, Even wins. If the coins show an odd number of heads, Odd wins. A tie is declared if no heads show. Draw a tree diagram to represent the possible events. Solution he result of the game Even wins, Odd wins, or they tie is a random variable since it depends on the outcomes of the coin tosses. Consider the following tree diagram showing the probabilities of the simple and compound events. 242 CAPER 4 DEALING WI UNCERAINY AN INRODUCION O PROBABILIY

5 ? hink about he Diagram Which diagram is more useful for finding the probabilities of the various possible events: Venn diagrams or tree diagrams? First Coin eads Second Coin eads Probability of Each Outcome P() = 0.25 P() = 0.25 Event Even wins Odd wins eads P() = 0.25 Odd wins P() = 0.25 ie Example 2 Rolling wo Dice Suppose you are playing a game in which you roll a red and a black six-sided die at the same time. Consider the event that the sum of the dice is 3. Is this event independent of the red die showing 1? Solution A sum of 3, with the red die showing 1, can only happen in one way, if the black die shows 2. here are 36 possible outcomes with the two dice. herefore, 1 P(red die shows 1 and sum is 3) 3 6 owever, P(red die shows 1) 1 6 and P(sum is 3) 2 36 or 1 18 herefore, P(red die shows 1) P(sum is 3) or As a result, P(red die shows 1 and sum is 3) P(red die shows 1) P(sum is 3) and the events must be dependent. 4.5 FINDING PROBABILIY USING REE DIAGRAMS AND OUCOME ABLES 243

6 Example 3 Predicting Soccer Results Suppose that a school s female soccer team has a history of winning 50% of the games it plays on rainy days and 60% of the games it plays on fair days. he weather forecast for the next game day calls for an 80% chance of rain. What is the probability that the team will win the game? Solution Draw a tree diagram that represents the sequence of outcomes as ordered pairs in the form (weather, game result). Weather Game Result Probability win P(rain, win) = 0.40 rain 0.8 lose P(rain, lose) = win P(fair, win) = 0.12 fair 0.4 lose P(fair, lose) = 0.08? hink about he Probabilities Why is the probability of the pair (rain, win) equal to the product 0.8? here are two simple events that result in a win. he probabilities for these events are as follows: P(rain, win) P(rain) P(win rain) P(fair, win) P(fair) P(win fair) he probability the team will win is, therefore, the sum CAPER 4 DEALING WI UNCERAINY AN INRODUCION O PROBABILIY

7 KEY IDEAS independent events two events are independent of each other if the occurrence of one event does not change the probability of the occurrence of the other event conditional probability for independent events if A and B are independent events, then P(A B) P(A); if this is not the case, the events are dependent and the formula for conditional probability must be applied Multiplicative Principle for probabilities of independent events if A and B are independent events, then P(A and B) P(A B) P(A) P(B) 4.5 Exercises A 1. Knowledge and Understanding A truck driver, Andrea Ortiz, has a choice of routes as she travels among four cities. She can choose from four routes between oronto and Oakville, two between Oakville and amilton, and three between amilton and Guelph. Find the total number of routes possible for complete oronto Oakville amilton Guelph trips. 2. A test has four true/false questions. (a) Draw the tree diagram that shows all possible true/false combinations for the answers to the test. (b) Determine the probability that a student will get all four correct by guessing. (c) Determine the probability that a student will get three questions correct by guessing. 3. Suppose you conduct an experiment in which you draw a card from a standard 52-card deck, return it to the deck, and then draw another card. List the outcomes of the following event spaces. (a) You get a seven of diamonds in both draws. (b) You get an ace of spades on the first draw and a seven of diamonds on the second. (c) You get a numbered club on both draws. (d) You get an ace on the first draw and an even club on the second. 4.5 FINDING PROBABILIY USING REE DIAGRAMS AND OUCOME ABLES 245

8 B 4. Communication he faces of a standard six-sided die represent the numbers 1 through 6. wo of these dice, one red and the other white, are rolled simultaneously. (a) If you were to draw a tree diagram showing all possible combinations of the two dice, how many branches would it have? (b) Explain why there is only one combination for which the sum is 2. (c) Explain why there are two possible combinations for which the sum is 3. (d) Complete a chart like the one below for all possible sums of the two dice. (e) Sum Required Rolls (Red, White) 2 (1, 1) 3 (1, 2); (2, 1) 4 Find the probability of each possible sum. 5. A standard deck of cards has had all the face cards (jacks, queens, and kings) removed so that only the ace through ten of each suit remain. A game is played in which a card is drawn from this deck and a six-sided die is rolled. For the purpose of this game, an ace is considered to have a value of 1. (a) Determine the total number of possible outcomes for this game. (b) Describe the elements of the sample space for this experiment. (c) Find the probability of each of these events. (i) an even card and an even roll of the die (ii) an even card and an odd roll of the die (iii) a card of 3 and a roll of the die of 3 or less (iv) the sum of the card and the die is 7 (v) the sum of the card and the die is CAPER 4 DEALING WI UNCERAINY AN INRODUCION O PROBABILIY

9 6. Suppose the two joker cards are left in a standard deck of cards. One of the jokers is red and the other is black. A single card is drawn from the deck of 54 cards, returned, and then a second card is drawn. Determine the probability of drawing (a) one of the jokers on the first draw and an ace on the second (b) the red joker on the second draw and a numbered card of any suit on the first (c) a queen on both draws (d) any black card on both draws (e) any numbered card less than 10 on the first draw and a card with the same number on the second (f) the red joker or a red ace on either draw 7. Application An airplane can make a safe landing if at least half of its engines are working properly. Suppose that engine failures are independent events. Determine whether a two-engine plane is safer than a four-engine plane if the chance that an engine fails is 1 in A health and safety committee is to be selected from all the people who work at a local factory. he committee is to consist of four members selected randomly from a list of ten names submitted by the shop leader. he list has the names of five union members and five workers who are not union members. (a) What is the probability that the first person selected from the list is a union member? (b) What is the probability that the first two people selected from the list are union members? (c) What is the probability that all the committee members are union members? (d) What is the probability that three of the four committee members are union members? 9. A paper bag contains a mixture of 3 types of candy. here are ten chocolate bars, seven fruit bars, and three packages of toffee. Suppose a game is played in which a candy is randomly taken from the bag, replaced, and then a second candy is drawn from the bag. If you are allowed to keep the second candy only if it was the same type as the one that was drawn the first time, calculate the probability of each of the following. (a) you will be able to keep a chocolate bar (b) you will be able to keep any candy (c) you won t be able to keep any candy 4.5 FINDING PROBABILIY USING REE DIAGRAMS AND OUCOME ABLES 247

11 ADDIIONAL ACIEVEMEN CAR QUESIONS 14. Knowledge and Understanding Draw a tree diagram to list the outcome set for an experiment in which a die is rolled, and then a four-coloured equal-probability spinner (red, blue, green, yellow) is spun. Find each probability. (a) a 6 is rolled and green is spun (b) an even number is rolled or red is spun 15. Application Joshua and Ravinder are having a video-game competition. Over the course of one week, they play several times. hey have decided that the winner will be declared when someone wins three out of five games. Ravinder has had the game longer and his probability of winning each time is 3 5. Joshua s probability of winning each time is 2. Determine 5 the probability that Joshua will win the weekly competition. 16. hinking, Inquiry, Problem Solving Show that A and B are independent events if, and only if, P(A B) P(A B ). 17. Communication Explain the difference between independent and dependent events. Use an example in your explanation. Chapter Problem Analyzing a raditional Game CP9. Make an outcome table or a tree diagram to model the game. CP10. ow many outcomes are possible if the six counters are distinguishable? Indistinguishable? CP11. ow many ways can the counters produce results that end up in (a) 5 points awarded? (b) 1 point awarded? (c) 0 points awarded? CP12. Determine the probability that a player earns (a) 5 points on a turn (b) 1 point on a turn (c) 0 points on a turn CP13. Based on these probabilities, does the point structure seem reasonable? Explain. 4.5 FINDING PROBABILIY USING REE DIAGRAMS AND OUCOME ABLES 249

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