# Find the probability of an event by using the definition of probability

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1 LESSON 10-1 Probability Lesson Objectives Find the probability of an event by using the definition of probability Vocabulary experiment (p. 522) trial (p. 522) outcome (p. 522) sample space (p. 522) event (p. 522) probability (p. 522) impossible (p. 522) certain (p. 522) Additional Examples Example 1 Give the probability for the outcome. A. The basketball team has a 70% chance of winning. The probability of winning is P(win) %. The probabilities must add to, so the probability of not winning is P(lose), or %. 201 Holt Mathematics

2 LESSON 10-1 CONTINUED Example 2 A quiz contains 5 true or false questions. Suppose you guess randomly on every question. The table below gives the probability of each score. Score Probability A. What is the probability of guessing 3 or more correct? The event 3 or more correct consists of the outcomes,, and. P(3 or more correct) Example 3 PROBLEM SOLVING APPLICATION Six students are in a race. Ken s probability of winning is 0.2. Lee is twice as likely to win as Ken. Roy is 1 4 as likely to win as Lee. Tracy, James, and Kadeem all have the same chance of winning. Create a table of probabilities for the sample space. 1. Understand the Problem The answer will be a table of probabilities. Each probability will be a number from 0 to 1. The probabilities of all outcomes add to 1. List the important information: P(Ken) P(Lee) 2 P(Ken) P(Roy) 1 4 P(Lee) 1 4 P(Tracy) P(James) P(Kadeem) 202 Holt Mathematics

3 LESSON 10-1 CONTINUED 2. Make a Plan You know the probabilities add to 1, so use the strategy write an equation. Let p represent the probability for Tracy, James, and Kadeem. P(Ken) P(Lee) P(Roy) P(Tracy) P(James) P(Kadeem) p p p p 1 3. Solve 0.7 3p 1 Subtract from both sides. 3p 3p 0.3 Divide both sides by. p Outcome Ken Lee Roy Tracy James Kadeem Probability 4. Look Back Check that the probabilities add to Try This 1. Give the probability for the outcome. The softball team has a 55% chance of winning. Outcome Win Lose Probability 203 Holt Mathematics

4 LESSON 10-2 Experimental Probability Lesson Objectives Estimate probability using experimental methods Vocabulary experimental probability (p. 451) Additional Examples Example 1 A. The table shows the results of 500 spins of a spinner. Estimate the probability of the spinner landing on Outcome Spins number of spins that landed on probability total number of spins The probability of landing on 2 is about, or %. B. A marble is randomly drawn out of a bag and then replaced. The table shows the results after fifty draws. Estimate the probability of drawing a red marble. Outcome Green Red Yellow Draw number of probability marbles total number of draws The probability of drawing a red marble is about, or. 204 Holt Mathematics

6 LESSON 10-3 Use a Simulation Lesson Objectives Use a simulation to estimate probability Vocabulary simulation (p. 532) random numbers (p. 532) Additional Examples Example 1 PROBLEM SOLVING APPLICATION A dart player hits the bull s-eye 25% of the times that he throws a dart. Estimate the probability that he will make at least 2 bull s-eyes out of his next 5 throws. 1. Understand the Problem The answer will be the that he will make at least 2 bull s-eyes out of his next 5 throws. List the important information: The probability that the player will hit the bull s-eye is. 2. Make a Plan Use a to model the situation. Use digits grouped in pairs. The numbers represent a bull s-eye, and the numbers represent an unsuccessful attempt. Each group of 10 digits represent one trial Holt Mathematics

7 LESSON 10-3 CONTINUED 3. Solve Starting on the third row of the table and using 10 digits for each trial yields the following data: bull s eyes bull s eyes bull s eyes bull s eyes bull s eyes bull s eyes bull s eyes bull s eyes bull s eyes bull s eyes Out of the 10 trials, trials represented two or more bull s-eyes. Based on this simulation, the probability of making at least 2 bull s-eyes out of his next 5 throws is about, or %. 4. Look Back Hitting the bull s-eye at a rate of 20% means the player hits about bull s-eyes out of every 100 throws. This ratio is equivalent to 2 out of 10 throws, so he should make at least 2 bull s-eyes most of the time. The answer is reasonable. 207 Holt Mathematics

8 LESSON 10-4 Theoretical Probability Lesson Objectives Estimate probability using theoretical methods Vocabulary theoretical probability (p. 540) equally likely (p. 540) fair (p. 540) mutually exclusive (p. 542) Additional Examples Example 1 An experiment consists of spinning this spinner once. Find the probability of each event A. P(4) The spinner is, so all 5 outcomes are equally likely. The probability of spinning a 4 is P(4). B. P(even number) There are outcomes in the event of spinning an even number: and. number of possible P(spinning an even number) numbers 5 Example 2 An experiment consists of rolling one fair die and flipping a coin. Find the probability of each event. A. Show a sample space that has all outcomes equally likely. The outcome of rolling a 5 and flipping heads can be written as the ordered pair (5, H). There are possible outcomes. 208 Holt Mathematics

9 LESSON 10-4 CONTINUED Example 3 Stephany has 2 dimes and 3 nickels. How many pennies should be added so that the probability of drawing a nickel is 3 7? Adding pennies will the number of possible outcomes. Let x equal the number of Set up a proportion. 3(5 x) 3(7) Find the cross products. 15 Multiply. Subtract from both sides. 3x 6 Divide both sides by. x Stephany should add nickel is 3 7. pennies so that the probability of drawing a 209 Holt Mathematics

10 LESSON 10-4 CONTINUED Example 4 Suppose you are playing a game in which you roll two fair dice. If you roll a total of five you will win. If you roll a total of two, you will lose. If you roll anything else, the game continues. What is the probability that the game will end on your next roll? It is impossible to roll a total of 5 and a total of 2 at the same time, so the events are exclusive. Add the probabilities to find the probability of the game ending on your next roll. The event total 5 consists of outcomes,, so P(total 5). The event total 2 consists of outcome,, so P(total 2). P(game ends) P(total 5) P(total 2) The probability that the game will end is, or about %. Try This 1. An experiment consists of spinning this spinner once. Find the probability of the event. P(odd number) An experiment consists of flipping two coins. Find the probability of the event. P(one head and one tail) 210 Holt Mathematics

11 LESSON 10-5 Independent and Dependent Events Lesson Objectives Find the probabilities of independent and dependent events Vocabulary compound event (p. 545) independent events (p. 545) dependent events (p. 545) Additional Examples Example 1 Determine if the events are dependent or independent. A. getting tails on a coin toss and rolling a 6 on a number cube Tossing a coin does not affect rolling a number cube, so the two events are. Example 2 Three separate boxes each have one blue marble and one green marble. One marble is chosen from each box. A. What is the probability of choosing a blue marble from each box? The outcome of each choice does not affect the outcome of the other choices, so the choices are. In each box, P(blue). P(blue, blue, blue) Multiply. 211 Holt Mathematics

12 LESSON 10-5 CONTINUED Example 3 The letters in the word dependent are placed in a box. A. If two letters are chosen at random, what is the probability that they will both be consonants? P(first consonant) If the first letter chosen was a consonant, now there would be 5 consonants and a total of 8 letters left in the box. Find the probability that the second letter chosen is a consonant. P(second consonant) Multiply. The probability of choosing two letters that are both consonants is. B. If two letters are chosen at random, what is the probability that they will both be consonants or both be vowels? The probability of two consonants was calculated in Additional Example 3A. Now find the probability of getting two vowels. P(vowel) Find the probability that the first letter chosen is a vowel. If the first letter chosen is a vowel, there are now only total letters left. vowels and P(vowel) Find the probability that the second letter chosen is a vowel Multiply. 4 The events of both letters being consonants or both being vowels are mutually exclusive, so you can add their probabilities. 5 1 P(consonants) P(vowels) 2 The probability of both letters being consonants or both being vowels is. 212 Holt Mathematics

13 LESSON 10-6 Making Decisions and Predictions Lesson Objectives Use probability to make decisions and predictions Example 1 A. The table shows the satisfaction rating in a business s survey of 500 customers. Of their 240,000 customers, how many should the business expect to be unsatisfied? Pleased Satisfied Unsatisfied number of unsatisfied customers total number of customers Find the probability of a customer being 7 1 Set up a proportion n Find the cross products n Solve for n. 100 n The business should expect customers to be unsatisfied. 213 Holt Mathematics

14 LESSON 10-6 CONTINUED B. Jared randomly draws a card from a 52-card deck and tries to guess what it is. If he tries this 1040 times over the course of his life, what is the best prediction for the amount of times it actually works? number of possible correct guesses total possible outcomes Set up a proportion. 1 52n Find the cross products. Find the theoretical probability of Jared guessing the correct card n Solve for n. 52 n Jared can expect to guess the correct card times in his life. Example 2 In a game, two players each flip a coin. Player A wins if exactly one of the two coins is heads. Otherwise, player B wins. Determine whether the game is fair. List all possible outcomes. H, H H, T T, H T, T Find the theoretical probability of each player s winning. P(player A winning) There are combinations of exactly one of the two coins landing on heads. P(player B winning) There are combinations of the coin not landing on exactly one head. Since the P(player A winning) P(player B winning), the game is. 214 Holt Mathematics

15 LESSON 10-7 Odds Lesson Objectives Convert between probabilities and odds Vocabulary odds in favor (p. 554) odds against (p. 554) Additional Examples Example 1 In a club raffle, 1,000 tickets were sold, and there were 25 winners. A. Estimate the odds in favor of winning this raffle. The number of outcomes is 25, and the number of outcomes is The odds in favor of winning this raffle are about to, or to. B. Estimate the odds against winning this raffle. The odds in of winning this raffle are 1 to 39, so the odds against winning this raffle are about to. 215 Holt Mathematics

16 LESSON 10-7 CONTINUED Example 2 A. If the odds in favor of winning a CD player in a school raffle are 1:49, what is the probability of winning a CD player? 1 P(CD player) 1 49 On average there is 1 win for every losses, so someone wins 1 out of every times. B. If the odds against winning the grand prize are 11,999:1, what is the probability of winning the grand prize? If the odds winning the grand prize are 11,999:1, then the odds in favor of winning the grand prize are. 1 P(grand prize) 1 1 1,999 Example 3 1 A. The probability of winning a free dinner is 2. What are the odds in 0 favor of winning a free dinner? On average, 1 out of every people wins, and the other 19 people lose. The odds in favor of winning the meal are 1:(20 1), or. 1 B. The probability of winning a door prize is 1. What are the odds 0 against winning a door prize? On average, out of every 10 people wins, and the other 9 people lose. The odds against the door prize are (10 1):1, or. Try This 1. Of the 1750 customers at an arts and crafts show, 25 will win door prizes. Estimate the odds in favor of winning a door prize. 216 Holt Mathematics

17 LESSON 10-8 Counting Principles Lesson Objectives Find the number of possible outcomes in an experiment Vocabulary Fundamental Counting Principle (p. 558) tree diagram (p. 559) Addition Counting Principle (p. 559) Additional Examples Example 1 License plates are being produced that have a single letter followed by three digits. A. Find the number of possible license plates. Use the Counting Principle. letter first digit second digit third digit choices choices choices choices The number of possible 1-letter, 3-digit license plates is. B. Find the probability that a license plate has the letter Q. P(Q ) Holt Mathematics

18 LESSON 10-8 CONTINUED License plates are being produced that have a single letter followed by three digits. C. Find the probability that a license plate does not contain a 3. There are choices for any digit except possible license plates without a 3. P(no 3) 26,000 Example 2 You have a photo that you want to mat and frame. You can choose from a blue, purple, red, or green mat and a metal or wood frame. Describe all of the ways you could frame this photo with one mat and one frame. You can find all of the possible outcomes by making a tree. There should be different ways to frame the photo. Each branch of the tree diagram represents a different way to frame the photo. The ways shown in the branches could be written as 218 Holt Mathematics

19 LESSON 10-9 Permutations and Combinations Lesson Objectives Find permutations and combinations Vocabulary factorial (p. 563) permutation (p. 563) combination (p. 564) Additional Examples Example 1 Evaluate each expression. A. 8! Example 2 Jim has 6 different books. A. Find the number of orders in which the 6 books can be arranged on a shelf. The number of books is. P!! ( )!! The books are arranged at a time. There are permutations. This means there are orders in which the 6 books can be arranged on the shelf. 219 Holt Mathematics

20 LESSON 10-9 CONTINUED Example 3 Mary wants to join a book club that offers a choice of 10 new books each month. A. If Mary wants to buy 2 books, find the number of different pairs she can buy. possible books C!!!( )!!! books chosen at a time There are combinations. This means that Mary can buy different pairs of books. B. If Mary wants to buy 7 books, find the number of different sets of 7 books she can buy. 10 possible books 10 C 7!!!( )!!! There are combinations. This means that there are different 7-book sets Mary can buy. Try This 1. Evaluate the expression. 9! (8 2)! 220 Holt Mathematics

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