# What Do You Expect Unit (WDYE): Probability and Expected Value

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1 Name: Per: What Do You Expect Unit (WDYE): Probability and Expected Value Investigations 1 & 2: A First Look at Chance and Experimental and Theoretical Probability Date Learning Target/s Classwork Homework Self-Assess Your Learning Mon, Feb. 27 Conduct an experiment and P. 2: WDYE 1.1: WDYE Inv 1-2 compare the amount of Tossing Coins to Day 1 p. 3 variation in a small number of trials versus a large number of trials. Find Probabilities Correct with the EDpuzzle Tues, Feb. 28 Weds, Mar. 1 Thurs, Mar. 2 Fri, Mar. 3 Conduct an experiment and write probabilities of possible outcomes as fractions. Conduct an experiment and calculate relative frequencies (experimental probabilities). Determine whether the outcomes of an event are equally likely. Describe properties of theoretical probability. P. 4: WDYE 1.2: Finding More Probabilities P. 6-7: WDYE 1.3: Finding Experimental Probabilities P. 9: WDYE 1.4: Understanding Equally Likely Pg. 10: WDYE 2.1: Predicting to Win Exit Ticket P : WDYE 2.2: Developing Probability Models WDYE Inv 1-2 Day 2 p. 5 Correct with the EDpuzzle WDYE Inv 1-2 Day 3 p. 8 Correct with the EDpuzzle WDYE Inv 1-2 Day 4 p. 11 Correct with the EDpuzzle WDYE Inv 1-2 Day 5 p. 14 Correct with the EDpuzzle I have reviewed with a parent/guardian and I am satisfied with the work produced in this packet. Student signature: Parent/Guardian Signature: 1

3 Day 1 HOMEWORK: WDYE 1.1: Complete and CORRECT with the EDpuzzle. 1. Miki tosses a coin 50 times, and the coin shows heads 28 times. What fraction of the 50 tosses is heads? What percent is this? Fraction: Percent: 2. Kalvin tosses a coin five days in a row and gets tails every time. Do you think there is something wrong with the coin? How can you find out? 3. Suppose the coin is fair, and Miki tosses it 500 times. About how many times can she expect it to show heads? Explain your reasoning. 4. Len tosses a coin three times. The coin shows heads every time. What are the chances the coin shows tails on the next toss? Explain. 5. Is it possible to toss a coin 20 times and have it land heads up 20 times? Is this likely to happen. Explain. 6. Colby rolls a number cube 50 times. She records the result of each roll and organizes her data in the table below. a) What fraction of the rolls are 2 s? What percent is this? Fraction: Percent: b) What fraction of the rolls are odd numbers? What percent is this? Fraction: Percent: c) What percent of the rolls is greater than 3? d) Suppose Colby rolls the number cube 100 times. About how many times can she expect to roll an odd number? Explain. 3

4 Day 2 WDYE 1.2: TOSSING COINS TO FIND PROBABILITIES Trial Number Result (End or Side) Use your results to answer the following questions: 1. For what fraction of your 25 tosses did the cup land on one of its ends? What percent is this? 2. For what fraction of your 25 tosses did the cup land on its side? What percent is this? 3. Do the landing positions end and side have the same chance of occurring? If not, which is more likely? Explain: 4. Which of the cup s landing positions should Kalvin use to represent Cocoa Blast? Explain: 5. Combine the data from all the group sin your class. Based on these data, would you change your answers to the previous questions? Explain. 6. Kalvin s mother agrees to let him use a cup to decide his cereal each morning. On the first morning, the cup lands on its end. On the second morning, it lands on its side. Kalvin says, This cup isn t any better than the coin. It lands on an end 50% of the time! Do you agree or disagree with Kalvin? Explain. 4

5 Day 2 HOMEWORK: WDYE 1.2: Complete and CORRECT with the EDpuzzle. 1. Kalvin tosses a paper cup once each day for a year to determine his breakfast cereal. Use your results from Problem 1.2 (today s classwork) to answer the following: a. How many times do you expect the cup to land on its side? b. How many times do you expect the cup to land on one of its ends? c. How many times do you expect Kalvin to eat Cocoa Blast in a month? Explain. d. How many times do you expect Kalvin to eat Cocoa Blast in a year? Explain. 2. Dawn tosses a pawn from her chess set five times. It lands on its base four times and on its side only once. Andre tosses the same pawn 100 times. It lands on its base 28 times and on its side 72 times. Based on their data, if you toss the pawn one more time, is it more likely to land on its base or its side? Explain. 3. Use the graph to answer the following questions. a. Suppose 41,642 people moved. About how many of those people moved for family-related reasons? b. What fraction of the people represented in the graph moved for reasons other than work-related, housing-related, or family-related? c. Suppose 41,642 people moved. About how many moved for housing-related reasons? 5

6 Day 3 WDYE 1.3: FINDING EXPERIMENTAL PROBABILITIES The mathematical word for chance is. A probability that you find by conducting an experiment and collecting data is called an. Suppose you toss a paper cup 50 times, and it lands on its side 31 times. Each toss of the cup is a. In this experiment, there are 50 trials. are the trials in which a desired result occurs. In this case, a favorable result, landed on side, occurred 31 times. To find the experimental probability, use the ratio below: You can write the probability of the cup landing on its side as ( ). The equation below gives the results of the experiment just described. P(side) = = The ratio of number of desired results to the total number of trials is also called. Kalvin comes up with one more way to use probability to decide his breakfast cereal. This time, he tosses two coins. If the coins match he gets to eat Cocoa Blast. If they don t match he gets to eat Healthy Nut Flakes. How many days in the month do you predict Kalvin will get to eat Coca Blast? Conduct an experiment by tossing a pair of coins 30 times. Keep track of the number of times the coins match and number times no match occurs. Trial Number Result (Match or No Match) Trial Number Result (Match or No Match) Trial Number Result (Match or No Match)

7 1. Based on your data, what is the experimental probability of getting a match? P(match) = 2. Based on your data, what is the experimental probability of getting a no-match? P(no match) = 3. Combine your data with your classmates data. a. Find the experimental probabilities for the combined data. Compare these probabilities with those that you found in your experiment. b. Based on the class data, do you think a match and a no-match have the same chance of occurring? Explain. 4. Think about the possible results when you toss two coins. a. In how many ways can a match occur? b. In how many ways can a no-match occur? c. Based on the number of ways each result can occur, do a match and a no-match have the same chance of occurring? Explain. 5. Kalvin s friend Asta suggests that he toss a thumbtack. If it lands on its side, he eats Cocoa Blast. If it lands on its head, he eats Health Nut Flakes. She says they must first experiment to find the probabilities involved. Asta does 11 tosses. Kalvin does 50 tosses. Here are the probabilities they find based on their experiments. Asta = P(heads) = 6/11 Kalvin = P(heads) = 13/50 Which result do you think better predicts the experimental probability of the thumbtack landing on its head when tossed? Explain. 7

9 Day 4 WDYE 1.4: UNDERSTANDING EQUALLY LIKELY & 2.1: PREDICTING TO WIN What does it mean for a coin to be fair? What does it mean for events to be equally likely? 1. The list below gives several actions and possible results. In each case, decide whether the possible results are equally likely and explain. For actions 5 and 6, start by listing all the possible results. Action Possible Results Equally Likely? Why or Why Not You toss an empty juice can A baby is born The can lands on its side, lands upside-down, or the can lands right-side-up The baby is a boy or the baby is a girl A baby is born The baby is right-handed or the baby is left-handed A high school team plays a football game The team wins or the team loses You roll a six-sided number cube You guess an answer on a true or false test 2. For which of the actions in the first question did you find the results to be equally likely? Does this mean that the probability of each result is ½ (or 50%)? Explain your reasoning. 3. Describe an action for which the results are equally likely. 4. Describe an action for which the results are not equally likely. 9

10 2.1: Predicting to Win In Investigation 1, you collected the results of many coin tosses. You found that the experimental probability of a coin landing on heads is ½ (or very close to ½). You assume that the coins are fair coins for which there are two equally likely results of a toss, heads or tails. The word means an individual result of an action or event. The coin-tossing experiment had two possible outcomes, heads and tails. Heads was a favorable outcome for Kalvin. A probability calculated by examining possible outcomes, rather than by experimenting, is a. P(heads) = = The probability of tossing heads is 1 of 2 or ½. The probability of tossing tails is also ½. The Gee Whiz Block-Guessing Game: What do you think random means? Play the Gee Whiz block-guessing game with your group. Then answer these questions: 1. Based on the data you collect during the game, find the experimental probabilities of choosing red, choosing yellow, and choosing blue. (Use probability notation, such as P(red) = ). 2. Count the number of red blocks, blue blocks, and yellow blocks in the bucket and calculate the theoretical probabilities of drawing each color block. (Use probability notation, such as P(red) = ). 3. Does each individual block, regardless of color, have the same chance of being chosen? 4. If you choose a block, is it equally likely that it will be red or blue? 5. Which person has the advantage the first person to choose from the bucket or the last person? Explain. 10

11 Day 4 HOMEWORK: WDYE 1.4/2.1: Complete and CORRECT with the EDpuzzle. 1. Decide whether the possible results are equally likely: Action Possible Results Equally Likely? Why or Why Not Your phone rings at 9pm The caller is your best friend, the caller is a relative, or the caller is someone else You check the temperature at your home tomorrow morning You spin the pointer once on a spinner that is 50% red, 25% blue and 25% yellow You find out how many car accidents occurred in your city or town yesterday The temperature 30 degrees F or above, or the temperature is below 30 degrees F The pointer lands on yellow, red, or blue There were fewer than five accidents, there were exactly five accidents, or there were more than five accidents 2. Give an example of a result that would have a probability near the percent given. Percent Example of a Result Percent Example of a Result 0% 25% 50% 100% 3. A bucket contains one green block, one red block, and two yellow blocks. You choose on block from the bucket. a. Find the theoretical probability that you will choose each color. (Use probability notation, such as P(red) = ). b. Find the sum of the probabilities in part (a). c. What is the probability that you will not choose a red block? (Use probability notation, such as P(not red) = ). Explain how you found your answer. d. What is the sum of the probability of choosing a red block and the probability of not choosing a red block? 11

12 Day 5 WDYE 2.2: DEVELOPING PROBABILITY MODELS 1. A bag contains two yellow marbles, four blue marbles, and six red marbles. You choose a marble from the bag at random. Answer the following questions and explain your reasoning. (Use probability notation, such as P(red) = ). a. What is the probability the marble is yellow? b. What is the probability the marble is blue? c. What is the probability the marble is red? 2. What is the sum of the probabilities from question 1? 3. What color is the selected marble most likely to be? 4. What is the probability the marble is not blue? 5. What is the probability the marble is either red or yellow? 6. What is the probability the marble is white? 7. Jakayla says the probability the marble is blue is 12/4. Adsila says 12/4 is impossible. Which girl is correct? 12

13 8. Suppose a new bag has twice as many marbles of each color. a. Do the probabilities change? Explain. b. How many blue marbles should you add to this bag to have the probability of choosing a blue marble equal to ½? 9. A different bag contains several marbles. Each marble is red or white or blue. The probability of choosing a red marble is 1/3, and the probability of choosing a white marble is 1/6. a. What is the probability of choosing a blue marble? Explain. b. What is the least number of marbles that can be in the bag? c. Suppose the bag contains the least number of marbles. How many of each color does the bag contain? d. Can the bag contain 48 marbles? If so, how many of each color does it contain? e. Suppose the bag contains 8 red marbles and 4 white marbles. How many blue marbles does it contain? 10. Do you think the experimental probabilities would be different with blocks instead of marbles? How about theoretical probabilities? 11. Challenge: Design a fair way for Kalvin to choose his breakfast cereal using blocks or marbles. 13

14 Day 5 HOMEWORK: WDYE 2.2: Complete and CORRECT with the EDpuzzle. 1. A bubble gum machine contains 25 gumballs. There are 12 green, 6 purple, 2 orange, and 5 yellow gumballs. a. Find each theoretical probability. (Use probability notation, such as P(red) = ). b. Find the sum: P(green) + P(yellow) + P(orange) + P(purple) = c. Write each of the probabilities in part (a) as a percent. d. What is the sum of all the probabilities as a percent? 2. A bag contains two white blocks, one red block, and three purple blocks. You choose one block from the bag. a. Find each probability. (Use probability notation, such as P(red) = ). b. What is the probability of not choosing a white block? Explain how you found your answer. c. Suppose the number of blocks of each color is doubled. What happens to the probability of choosing each color? d. Suppose you add two more blocks of each color to the original bag. What happens to the probability of choosing each color? e. How many blocks of which colors should you add to the original bag to make the probability of choosing a red block equal to ½? 14

15 Warm-Ups 15

16 Warm-Ups 16

### 1. a. Miki tosses a coin 50 times, and the coin shows heads 28 times. What fraction of the 50 tosses is heads? What percent is this?

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### 2. A bubble-gum machine contains 25 gumballs. There are 12 green, 6 purple, 2 orange, and 5 yellow gumballs.

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