Name Date Class. 2. dime. 3. nickel. 6. randomly drawing 1 of the 4 S s from a bag of 100 Scrabble tiles

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1 Name Date Class Practice A Tina has 3 quarters, 1 dime, and 6 nickels in her pocket. Find the probability of randomly drawing each of the following coins. Write your answer as a fraction, as a decimal, and as a percent. The first one is done for you. Fraction Decimal Percent 1. quarter 2. dime % 3. nickel Find the probability of each event. Write your answer as a fraction, as a decimal, and as a percent. Round to the nearest tenth of a percent. The first one is done for you. 4. randomly choosing a red card in a game that has 10 red, 10 blue, 10 green, 10 yellow cards, and 10 orange cards 1 ; 0.2; 20% 5 5. tossing two fair coins and having both land tails up 6. randomly drawing 1 of the 4 S s from a bag of 100 Scrabble tiles A game has 12 blue disks, 10 red disks, and 8 black disks. Find the probability of each event when a disk is chosen at random. 7. red 9. blue 8. black 10. not red or blue 239 Holt McDougal Mathematics

2 Name Date Class Practice B Find the probability of each event. Write your answer as a fraction, as a decimal, and as a percent. Round to the nearest tenth of a percent. 1. randomly choosing a white counter from a bag of 12 red counters, 12 white counters, 12 green counters, and 12 blue counters 2. tossing two fair coins and having one land on tails and one land on heads 3. rolling a number greater than 1 on a fair number cube 4. randomly choosing an orange disk from a bag of 14 black disks, 4 blue disks and 12 orange disks 5. randomly choosing 1 of the 6 R s from a bag of 100 letter tiles 6. spinning a number less than 7 on a fair spinner with 8 equal sections labeled 1 8 A set of cards has 20 cards with stars, 10 cards with squares, and 15 cards with circles. Find the probability of each event when a card is chosen at random. 7. square 8. circle 9. star or circle 10. not circle or square There are 14 girls and 18 boys in Ms. Wiley s class. Ms. Wiley randomly selects one student to solve a problem. Find the probability of each event. 11. selecting a boy 12. selecting a girl 241 Holt McDougal Mathematics

3 Name Date Class Practice C Find the probability of each event. Write your answer as a fraction, as a decimal, and as a percent. Round to the nearest tenth of a percent. 1. tossing three fair quarters and having all three of them land on heads 2. randomly choosing a classical CD from a collection of CDs consisting of 35 jazz CDs, 20 classical CDs, 25 rock CDs, and 5 country music CDs 3. randomly drawing a card with an even number from a shuffled deck of 52 cards with four 13-card suits (diamonds, hearts, clubs and spades), each of which has 9 number cards labeled 2-10 and 4 other cards 4. randomly choosing a vowel from a bag of 100 Scrabble tiles that has 12 E s, 9 I s, 8 O s, 4 U s and 2 Y s. There are 15 girls and 9 boys in Anne s yoga class. One of them is randomly selected to demonstrate a yoga position. Find the probability of each event. 5. selecting a boy 6. selecting a girl Find the probability of each event when two 1 6 number cubes are rolled. 7. P(total of 5) 8. P(total of 10) 9. P(total 7) 10. P(total <2) 242 Holt McDougal Mathematics

4 Name Date Class Problem Solving Write the correct answer in simplest form. The table lists the pieces used in the game of chess. 1. If you randomly choose a piece of the chess set, what is the probability that it is a pawn? Write your answer as a decimal. Solution: There are 8 black pawns and 8 white pawns. Add to find the total number of favorable outcomes = 16 Add all the pieces to find the total number of outcomes = 32 The probability of choosing a pawn is 16. Convert this to a decimal = 0.5 Choose the letter for the best answer. 3. Mr. Rose draws names to see who will give the first book report. There are 10 boys and 14 girls in his class. What is the probability that he will draw a girl s name? A B Stanley is reading a 224-page book. There are illustrations on 14 pages. If Stanley opens the book at random, what is the probability that the page will have an illustration? C 5 7 A B C Chess Set Type White Black Pawn 8 8 Rook 2 2 Knight 2 2 Bishop 2 2 Queen 1 1 King If you randomly choose a piece of the chess set, what is the probability that it is a pawn? How many pawns are there? How many total pieces are there? Write the probability as a fraction. 4. Eight students will give reports on novels, 9 will report on biographies, and 7 will report on history books. What is the probability that the first report will be a novel? A B C In Congress, each of the 50 states is represented by 2 senators. If you choose a senator randomly, what is the probability that you will choose a senator that represents Virginia? A 10% B 4% C 2% 243 Holt McDougal Mathematics

5 Name Date Class Review for Mastery The theoretical probability of an event is found by comparing the number of ways an event can occur to the total number of equally likely outcomes. number of ways the event can occur theoretical probability = total number of equally likely outcomes One of the games at a carnival is the Wheel of Letters. Find the probability that the wheel will stop on each letter. Write your answer as a fraction, as a decimal, and as a percent. 1. The spinner has equal sections. Each section is an equally likely outcome. 2. There is section marked A. 3. There are sections marked B. 4. There are sections marked C. 5. There are sections marked D. 6. P(B) = = 0.3 = % 7. P(A) = = 0.1 = % 8. P(C) = = = 0.4 = % 9. P(D) = = = 0.2 = % There are 11 pennies and 9 dimes in a bag. Find the probability of each event. Write your answer as a fraction, as a decimal, and as a percent. 10. Find the probability that a dime will be randomly selected from the bag. P(dime) = = 0.45 = % 11. P(penny) = = 0.55 = There are 6 yellow cards, 4 blue cards, and 10 green cards in a bag. A card is chosen at random. Find the probability of each event. 12. yellow 13. blue 14. green 15. blue or green 32 Holt McDougal Mathematics

6 Name Date Class Challenge Spinner Sums Suppose these three spinners are each spun once. 1. Complete the organized list so that it shows every sum that is possible if all three spinners are spun once. First Spinner Shows = = = = = = = = = 7 First Spinner Shows = 4 First Spinner Shows 3 2. Complete the table using the chart of sums in Exercise 1. Sum of Spinners Number of Ways to Get the Sum 3. How many possible outcomes are there if you spin the three spinners? Using the table in Exercise 2, give the probability of getting each sum. Write the probability to the nearest tenth of a percent. 4. P(sum of 5) 5. P(sum > 7) 6. P(sum < 8) 33 Holt McDougal Mathematics

7 Name Date Class Reading Strategies Interpret Information When you are conducting an experiment, a favorable outcome is an outcome you are looking for. number of ways an outcome can occur probability(event) = total number of possible outcomes When you toss a number cube, there are 6 possible outcomes. There is only one way to get a 4 on the cube, so there is one favorable outcome for rolling a 4. Read: The probability of rolling a 4 is 1 out of 6. Write: P(rolling a 4) = 1 6 Answer each question. 1. What is the probability of rolling a two on the cube? 2. What are the even numbers on the cube? 3. What is the probability of rolling an even number? 4. What are the odd numbers on the cube? 5. What is the probability of rolling an odd number. If events have the same chance of happening, they are equally likely to occur. 6. Is the probability of rolling a 5 or an even number equally likely? 7. Is the probability of rolling an odd or an even number equally likely? 34 Holt McDougal Mathematics

8 Name Date Class Puzzles, Twisters & Teasers Probably Problems! Across 1. probability is used to calculate the probability of an event when all outcomes are equally likely. 3. You can write a as a decimal or a fraction. 5. If each possible outcome of an experiment is equally likely, the experiment is said to be. 7. You can write a as a fraction or a percent. 8. A outcome is one that you are looking for when you conduct an experiment. Down 2. probability compares the number of times an event occurs to the total number of trials. 4. You can write as a fraction, a decimal, or a percent. 5. You can write a as a decimal or as a percent. 35 Holt McDougal Mathematics

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