# Probability of Compound Events

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1 Probability of Compound Events Why? Then You calculated simple probability. (Lesson 0-11) Now Find probabilities of independent and dependent events. Find probabilities of mutually exclusive events. Online glencoe.com Extra Examples Personal Tutor Self-Check Quiz Homework Help in Motion Evita is flying from Cleveland to Honolulu. The airline reports that the flight from Cleveland to Honolulu has a 40% on-time record. The airline also reported that they lose luggage 5% of the time. What is the probability that both the flight will be on time and Evita s luggage will arrive? Independent and Dependent Events Recall that one event, like flying from Cleveland to Honolulu, is called a simple event. A compound event is made up of two or more simple events. So, the probability that the flight will be on time and the luggage arrives is an example of a compound event. The plane being on time may not affect whether luggage is lost. These two events are called independent events because the outcome of one event does not affect the outcome of the other. Key Concept Words If two events, A and B, are independent, then the probability of both events occurring is the product of the probability of A and the probability of B. Symbols P(A and B) = P(A) P(B) Probability of Independent Events Model C12-17P : Person getting luggage at baggage carousel For Your BrainPOP glencoe.com EXAMPLE 1 Independent Events MARBLES A bag contains black marbles, 9 blue marbles, 4 yellow marbles, and 2 green marbles. A marble is selected, replaced, and a second marble is selected. Find the probability of selecting a black marble, then a yellow marble. First marble: P(black) = _ 21 Second marble: P(yellow) = 4_ 21 number of black marbles total number of marbles number of yellow marbles total number of marbles P(black, yellow) = P(black) P(yellow) Probability of independent events = _ 21 4_ 21 or 24_ Substitution 441 The probability is _ 24 or about 5.4%. 441 Check Your Progress Find each probability. 1A. P(blue, green) 1B. P(not black, blue) Personal Tutor glencoe.com Lesson 12-5 Probability of Compound Events 771

3 Study Tip Mutually Exclusive Events Events that cannot occur at the same time are called mutually exclusive events. Suppose you wanted to find the probability of drawing a heart or a diamond. Since a card cannot be both a heart and a diamond, the events are mutually exclusive. and and or While probabilities involving and deal with independent and dependent events, probabilities involving or deal with mutually exclusive and non-mutually exclusive events. Key Concept Words If two events, A and B, are mutually exclusive, then the probability that either A or B occurs is the sum of their probabilities. Symbols P(A or B) = P(A) + P(B) Mutually Exclusive Events Model For Your EXAMPLE 3 Mutually Exclusive Events Study Tip Alternative Method In Example 3a, you could have placed the number of possible outcomes over the total number of outcomes. _ = 2_ or 3 A die is being rolled. Find each probability. a. P(3 or 5) Since a die cannot show both a 3 and a 5 at the same time, these events are mutually exclusive. P(rolling a 3) = P(rolling a 5) = number of sides with a 3 number of sides with a 5 P(3 or 5) = P(rolling a 3) + P(rolling a 5) Probability of mutually exclusive events = + Substitution = 2_ or Add. 3 The probability of rolling a 3 or a 5 is or about 33%. 3 b. P(at least 4) Rolling at least a 4 means you can roll either a 4, 5, or a. So, you need to find the probability of rolling a 4, 5, or a. P(rolling a 4) = P(rolling a 5) = P(rolling a ) = number of sides with a 4 number of sides with a 5 number of sides with a P(at least 4) = P(rolling a 4) + P(rolling a 5) + P(rolling a ) = = _ 3 or 2 The probability of rolling at least a 4 is or about 50%. 2 Check Your Progress 3A. P(less than 3) 3B. P(even) + + Mutually exclusive events Substitution Add. Personal Tutor glencoe.com Lesson 12-5 Probability of Compound Events 773

4 Reading A or B Unlike everyday language, the expression A or B allows the possibility of both A and B occurring. Suppose you want to find the probability of randomly drawing a 2 or a diamond from a standard deck of cards. Since it is possible to draw a card that is both a 2 and a diamond, these events are not mutually exclusive. P(2) P(diamond) P(2, diamond) 4_ 13_ Twos In the first two fractions above, the probability of drawing the two of diamonds is counted twice, once for a two and once for a diamond. To find the correct probability, subtract P(2 of diamonds) from the sum of the first two probabilities. P(2 or a diamond) = P(2) + P(diamond) - P(2 of diamonds) = 4_ 52 + _ = _ 1 or 4_ The probability is 4_ or about 31% Diamonds Watch Out! Intersection of Events When determining the probability of events that are not mutually exclusive, you may count the intersection of the events twice since it occurs in both events. It only actually occurs once. Key Concept Words If two events, A and B, are not mutually exclusive, then the probability that either A or B occurs is the sum of their probabilities decreased by the probability of both occurring. Events that are Not Mutually Exclusive Model Symbols P(A or B) = P(A) + P(B) - P(A and B) For Your EXAMPLE 4 Events that are Not Mutually Exclusive STUDENT ATHLETES Of 240 girls, 17 are on the Honor Roll, 48 play sports, and 3 are on the Honor Roll and play sports. What is the probability that a randomly selected student plays sports or is on the Honor Roll? Since some students play varsity sports and are on the Honor Roll, the events are not mutually exclusive. P(sports) = _ 48 P(Honor Roll) = _ 17 P(sports and Honor Roll) = _ P(sports or Honor Roll) = P(sports) + P(HR) - P(sports and HR) = _ _ _ 3 Substitution 240 = _ 188 or _ 47 Simplify The probability is _ 47 or about 78%. 0 Check Your Progress 4. PETS Out of 5200 households surveyed, 2107 had a dog, 807 had a cat, and 303 had both a dog and a cat. What is the probability that a randomly selected household has a dog or a cat? Personal Tutor glencoe.com 774 Chapter 12 Statistics and Probability

5 Check Your Understanding Examples 1 and 2 pp Examples 3 and 4 pp Determine whether the events are independent or dependent. Then find the probability. 1. BABYSITTING A toy bin contains 12 toys, 8 stuffed animals, and 3 board games. Marsha randomly chooses 2 toys for the child she is babysitting to play with. What is the probability that she chose 2 stuffed animals as the first two choices? 2. FRUIT A fruit basket contains apples, 5 bananas, 4 oranges, and 5 peaches. Drew randomly chooses one piece of fruit, eats it, and chooses another piece of fruit. What is the probability that he chose a banana and then an apple? 3. MONEY Nakos has 4 quarters, 3 dimes, and 2 nickels in his pocket. Nakos randomly picks two coins out of his pocket. What is the probability Nakos did not choose a dime either time, if he replaced the first coin back in his pocket before choosing a second coin? 4. BOOKS Joanna needs a book to prop up a table leg. She randomly selects a book, puts it back on the shelf, and selects another book. What is the probability that Joanna selected two math books? SCIENCE SCIENCE SCIENCE SCIENCE A card is drawn from a standard deck of playing cards. Determine whether the events are mutually exclusive or not mutually exclusive. Then find the probability. 5. P(two or queen). P(diamond or heart) 7. P(seven or club) 8. P(spade or ace) Practice and Problem Solving = Step-by-Step Solutions begin on page R12. Extra Practice begins on page 815. Examples 1 and 2 pp About 5% of pet owners acquire their pets free or at low cost. Source: National Council or Pet Population Study and Policy Determine whether the events are independent or dependent. Then find the probability. 9. COINS If a coin is tossed 4 times, what is the probability of getting tails all 4 times? 10. DICE A die is rolled twice. What is the probability of rolling two different numbers? 11 CANDY A box of chocolates contains 10 milk chocolates, 8 dark chocolates, and white chocolates. Sung randomly chooses a chocolate, eats it, and then randomly chooses another chocolate. What is the probability that Sung chose a milk chocolate and then a white chocolate? 12. DICE A die is rolled twice. What is the probability of rolling two of the same numbers? 13. PETS Chuck and Rashid went to a pet store to buy dog food. They chose from 10 brands of dry food, brands of canned food, and 3 brands of pet snacks. What is the probability that Chuck and Rashid both chose dry food, if Chuck randomly chose first and liked the first brand he picked up? 14. CARS A rental agency has 12 white sedans, 8 gray sedans, red sedans, and 3 green sedans for rent. Mr. Escobar rents a sedan, returns it because the radio is broken, and gets another sedan. What is the probability that Mr. Escobar was given a green sedan and then a gray sedan? Lesson 12-5 Probability of Compound Events 775

7 32. TILES Kirsten and José are playing a game. Kirsten places tiles numbered 1 to 50 in a bag. José selects a tile at random. If he selects a prime number or a number greater than 40, then he wins the game. What is the probability that José will on his first turn? Reading Conditional Probability P(B A) is read the probability of B, given A. 33 MULTIPLE REPRESENTATIONS In this problem, you will explore conditional probability. Conditional probability is the probability that event B occurs given that event A has already occurred. It is calculated by dividing the probability of the occurrence of both events by the probability of the occurrence of the first event. The notation for conditional probability is P(B A). a. GRAPHICAL Draw a Venn diagram to illustrate P(A and B). b. VERBAL Write the formula for P(B A) given the Venn diagram. c. ANALYTICAL A jar contains 12 marbles, of which 8 marbles are red and 4 marbles are green. If marbles are chosen without replacement, find P(red) and P(red, green). d. ANALYTICAL Using the probabilities from part c and the Venn diagram in part a, determine the probability of choosing a green marble on the second selection, given that the first marble selected was red. e. ANALYTICAL Write a formula for finding a conditional probability. f. ANALYTICAL Use the definition from part e to answer the following: At a basketball game, 80% of the fans cheered for the home team. In the same crowd, 20% of the fans were waving banners and cheering for the home team. What is the probability that a fan waved a banner given that the fan cheered for the home team? H.O.T. Problems Use Higher-Order Thinking Skills 34. FIND THE ERROR George and Aliyah are determining the probability of randomly choosing a blue or red marble from a bag of 8 blue marbles, red marbles, 8 yellow marbles, and 4 white marbles. Is either of them correct? Explain. George P(blue or red) = P(blue) P(red) = _ 8 2 _ 2 = _ 48 7 about 7% Aliyah P(blue or red) = P(blue) + P(red) = _ _ 2 = _ 14 2 about 54% 35. CHALLENGE In some cases, if one bulb in a string of holiday lights fails to work, the whole string will not light. If each bulb in a set has a 99.5% chance of working, what is the maximum number of lights that can be strung together with at least a 90% chance that the whole string will light? 3. REASONING Suppose there are three events A, B, and C that are not mutually exclusive. List all of the probabilities you would need to consider in order to calculate P(A or B or C). Then write the formula you would use to calculate the probability. 37. OPEN ENDED Describe a situation in your life that involves dependent and independent events. Explain why the events are dependent or independent. 38. WRITING IN MATH Explain why the subtraction occurs when finding the probability of two events that are not mutually exclusive. Lesson 12-5 Probability of Compound Events 777

8 Standardized Test Practice 39. In how many ways can a committee of 4 be selected from a group of 12 people? A 48 B 483 C 495 D 11, A total of 925 tickets were sold for \$5925. If adult tickets cost \$7.50 and children's tickets cost \$3.00, how many adult tickets were sold? F 700 H 325 G 00 J SHORT RESPONSE A circular swimming pool with a diameter of 28 feet has a deck of uniform width built around it. If the area of the deck is 0π square feet, find its width. 42. The probability of heads landing up when you flip a coin is. What is the probability of 2 getting tails if you flip it again? A C 4 2 B 3 D 3 _ 4 Spiral Review 43. SHOPPING The Millers have twelve grandchildren, 5 boys and 7 girls. For their anniversary, the grandchildren decided to pool their money and have three of them shop for the entire group. (Lesson 12-4) a. Does this situation represent a combination or permutation? b. How many ways are there to choose the three? c. What is the probability that all three will be girls? 44. ECOLOGY A group of 1000 randomly selected teens were asked if they believed there was global warming. The results are shown in the table. Find the mean absolute deviation. (Lesson 12-3) Solve each equation. State any extraneous solutions. (Lesson 11-8) 45. 4_ a = 3_ 4. _ 3 a - 2 x = x x 48. _ 2n 3 + _ x + 1 = x - x = 2n - 3 Teen Ecology Survey Results Response Number Yes, strongly agree 312 Yes, mildly agree 340 No, I don t think so 109 No, absolutely not 11 Not sure COOKING Hannah was making candy using a two-quart pan. As she stirred the mixture, she noticed that the pan was about 2_ full. If each piece of candy has a 3 volume of about _ 3 ounce, approximately how many pieces of candy will Hannah 4 make? (Hint: There are 32 ounces in a quart.) (Lesson 11-3) 50. GEOMETRY A rectangle has a width of 3 5 centimeters and a length of 4 10 centimeters. Find the area of the rectangle. Write as a simplified radical expression. (Lesson 10-2) Skills Review Solve each equation. Check your solution. (Lesson 10-4) a = 52. a = = x 778 Chapter 12 Statistics and Probability 53. -k = = -y a - 2 = 10

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