# Probability and Compound Events Examples

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1 Probability and Compound Events Examples 1. A compound event consists of two or more simple events. ossing a die is a simple event. ossing two dice is a compound event. he probability of a compound event can be calculated if its outcomes are equally likely. 2. Example If three coins are tossed, what is the probability of getting exactly two heads? o calculate the probability, you need to know how many outcomes are possible. his may be done by using a tree diagram. 1st Coin 2nd Coin 3rd Coin Outcomes here are eight possible outcomes and three of them have exactly two heads. herefore, the probability of getting exactly two heads in one toss of three coins is 8 3 or You may wish to explain that these events are independent. he occurrence of heads or tails on one coin does not affect the occurrence of heads or tails on the other two coins. Probability and 2001, Rev Compound Events 1

2 3. Example Jody has four bottles of soft drink one bottle of cola, one of root beer, one of ginger ale, and one of orange. She chooses three of these bottles to take to a party. If she chooses the ginger ale, what is the probability she also chooses root beer? o calculate the probability, you need to know how many outcomes are possible. his may be done by using a tree diagram. 1st Choice 2nd Choice 3rd Choice Outcomes Cola Root beer Orange CR CO inger Ale Root beer Cola Orange RC RO Orange Cola Root beer OC OR here are six ways to choose the other two bottles. here are four ways to choose the root beer. 2 he probability that Jody also chooses the root beer is = = Example hree coins are tossed once. Draw a tree diagram to show all of the possible outcomes. 1st Coin 2nd Coin 3rd Coin Outcomes Probability and 2001, Rev Compound Events 2

3 5. Example A coin is tossed three times. Draw a tree diagram to show all of the possible outcomes. 1st oss 2nd oss 3rd oss Outcomes 6. hought Provoker Explain why the tree diagrams are the same for the two experiments above. When three coins are tossed, the occurrence of heads or tails on one of the coins does not affect the occurrence of heads or tails on the other coins. When one coin is tossed three times, the occurrence of heads or tails on one toss will not affect the occurrence of heads or tails on another toss. herefore, tossing three coins at the same time produces the same outcomes as tossing one coin three times. 7. Example If three coins are tossed, what is the probability of getting at most two heads? 1st Coin 2nd Coin 3rd Coin Outcomes 7 = Probability and 2001, Rev Compound Events 3

4 Name: Date: Class: Probability and Compound Events Worksheet An automobile dealer has cars available with the combinations of colors, engines, and transmissions indicated in the following tree diagram. A selection is made at random. Color Red Engine -cylinder 6-cylinder ransmission lue -cylinder 6-cylinder 1. What is the probability of selecting a car with manual transmission? 2. What is the probability of selecting a blue car with manual transmission? 3. What is the probability of selecting a car with a -cylinder engine and a manual transmission?. What is the probability of selecting a blue car with a 6-cylinder engine and an automatic transmission? Draw a tree diagram for questions 5 and 6. Use the results to answer each question. Probability and 2001, Rev Compound Events

5 5. Find the probability of getting exactly three tails when four coins are tossed. 6. Find the probability that a family with four children has exactly four girls. Assume that the probability a girl is born is the same as the probability a boy is born. 7. In Exercise 6, what is the probability that the family has two boys and two girls in any order? 8. Compare and contrast the tree diagrams for Exercise 5 and 6. For each shrimp, lobster, or chicken dinner in a restaurant, you have a choice of soup or salad. With shrimp you may have hash browns or a baked potato. With lobster you may have rice or hash browns. With chicken you may have rice, hash browns, or a baked potato. If all combinations are equally likely to be ordered, find each probability of an order containing each of the following. Draw a tree diagram to answer each question. 9. Shrimp 10. Rice 11. Shrimp and rice 12. Soup and hash browns 13. Chicken, salad, and rice Probability and 2001, Rev Compound Events 5

6 ill, Raul, and Joe are in a bicycle race. If each boy has an equal chance of winning, find each probability. Draw a tree diagram to answer each question. 1. Joe wins the race. 15. Raul finishes last. 16. Joe, Raul, and ill finish first, second, and third, respectively. Adam s class set up a lottery with two-digit numbers. he first digit is a number from 1 to. he second digit is a number from 3 to 8. Draw a tree diagram to answer each question. 17. What is the probability that was the winning number? 18. What is the probability that a number with a 2 in it wins? Probability and 2001, Rev Compound Events 6

7 Probability and Compound Events Worksheet Key An automobile dealer has cars available with the combinations of colors, engines, and transmissions indicated in the following tree diagram. A selection is made at random. Color Red Engine -cylinder 6-cylinder ransmission lue -cylinder 6-cylinder 1. What is the probability of selecting a car with manual transmission? 1 or What is the probability of selecting a blue car with manual transmission? 1 or What is the probability of selecting a car with a -cylinder engine and a manual transmission? 1 or What is the probability of selecting a blue car with a 6-cylinder engine and an automatic transmission? 1 or Probability and 2001, Rev Compound Events 7

8 Draw a tree diagram for questions 5 and 6. Use the results to answer each question. 1st oss 2nd oss 3rd oss th oss Outcomes 5. Find the probability of getting exactly three tails when four coins are tossed. 1 or 0.25 Probability and 2001, Rev Compound Events 8

9 Outcomes 6. Find the probability that a family with four children has exactly four girls. 1 or In Exercise 6, what is the probability that the family has two boys and two girls in any order? 3 or Compare and contrast the tree diagrams for Exercise 5 and 6. Answers may vary. A typical answer is that the tree diagrams are the same. Probability and 2001, Rev Compound Events 9

10 For each shrimp, lobster, or chicken dinner in a restaurant, you have a choice of soup or salad. With shrimp you may have hash browns or a baked potato. With lobster you may have rice or hash browns. With chicken you may have rice, hash browns, or a baked potato. If all combinations are equally likely to be ordered, find each probability of an order containing each of the following. Draw a tree diagram to answer each question. Outcomes Shrimp Lobster Chicken Soup Salad Soup Salad Soup Salad Shrimp soup hash browns Shrimp soup baked beans Shrimp salad hash browns Shrimp salad baked beans Lobster soup rice Lobster soup hash browns Lobster salad rice Lobster salad hash browns Chicken soup rice Chicken soup hash browns Chicken soup baked beans Chicken salad rice Chicken salad hash browns Chicken salad baked beans 9. Shrimp 2 or Rice 2 or Shrimp and rice Soup and hash browns 3 or Chicken, salad, and rice 1 or Probability and 2001, Rev Compound Events 10

11 ill, Raul, and Joe are in a bicycle race. If each boy has an equal chance of winning, find each probability. Draw a tree diagram to answer each question. Results ill Raul Joe Joe Raul ill Raul Joe ill Joe Raul Raul Joe ill Joe ill Raul Joe ill Raul ill Raul ill Joe Raul Joe ill Joe ill Raul Joe Raul ill 1. Joe wins the race. 1 or Raul finishes last. 1 or Joe, Raul, and ill finish first, second, and third, respectively. 1 or Probability and 2001, Rev Compound Events 11

12 Adam s class set up a lottery with two-digit numbers. he first digit is a number from 1 to. he second digit is a number from 3 to 8. Draw a tree diagram to answer each question. Results What is the probability that was the winning number? 1 or What is the probability that a number with a 2 in it wins? 1 or 0.25 Probability and 2001, Rev Compound Events 12

13 Student Name: Date: Probability and Compound Events Checklist 1. On questions 1 through, did the student write the probability correctly based on the tree diagram? a. All four (20 points) b. hree of the four (15 points) c. wo of the four (10 points) d. One of the four (5 points) 2. On questions 5 and 6, did the student draw the tree diagram correctly? a. oth (10 points) b. One of the two (5 points) 3. On questions 5 through 7, did the student find the probability correctly? a. All three (15 points) b. wo of the three (10 points) c. One of the three (5 points). On question 8, did the student contrast Exercise 5 and 6 correctly? a. Yes (10 points) b. Presented some key parts, but others were off base (5 points) 5. On questions 9 through 13, did the student draw the tree diagram correctly? a. Yes (10 points) b. Majority of the tree was correct (5 points) 6. On questions 9 through 13, did the student find the probability correctly? a. All five (25 points) b. Four of the five (20 points). c. hree of the five (15 points). d. wo of the five (10 points). e. One of the five (5 points). 7. On questions 1 through 16, did the student draw the tree diagram correctly? a. Yes (10 points) b. Majority of the tree was correct (5 points) Probability and 2001, Rev Compound Events 13

14 8. On questions 1 through 16, did the student find the probability correctly? a. All three (15 points) b. wo of the three (10 points) c. One of the three (5 points) 9. On questions 17 and 18, did the student draw the tree diagram correctly? a. Yes (10 points) b. Majority of the tree was correct (5 points) 10. On questions 17 and 18, did the student find the probability correctly? a. oth (10 points) b. One of the two (5 points) otal Number of Points A C D F 121 points and above 108 points and above 9 points and above 81 points and above 80 points and below Any score below C needs remediation! Probability and 2001, Rev Compound Events 1

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