# 10-7 Simulations. Do 20 trials and record the results in a frequency table. Divide the frequency by 20 to get the probabilities.

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1 1. GRADES Clara got an A on 80% of her first semester Biology quizzes. Design and conduct a simulation using a geometric model to estimate the probability that she will get an A on a second semester Biology quiz. Report the results using appropriate numerical and graphical summaries. Sample answer: While a random number generator would work, a spinner will be easier. Divide the spinner into two sectors, one containing 80% or 288 and the other containing 20% or 72. Another option would be to roll a six-sided die. Let 1-4 represent an A, let 5 represent a non A, and roll again for each 6. Do 20 trials and record the results in a frequency a. Calculate the expected value from each throw. b. Design a simulation and estimate the average value of this game. c. How do the expected value and average value compare? a. Find the sum of the products (outcome multiplied by the frequency) for each outcome. There are 25 total balloons, so there are 25 total outcomes. Divide the frequency by 20 to get the probabilities. b. With 25 outcomes, 16 will represent 25 points, 8 will represent 50 points, and 1 will represent 100 points. Use a random number generator to generate integers 1 through 25 where 1 16 represents 25 points, represents 50 points, and 25 represents 100 points. Do 50 trials and record the results in a frequency The probability of Clara getting an A on her next quiz is.85. The probability of earning any other grade is or CARNIVAL GAMES The object of the game shown is to accumulate points by using a dart to pop the balloons. Assume that each dart will hit a balloon. The average value is calculated the same way as the expected value, except we use the simulation frequencies as opposed to the expected frequencies. c. Sample answer: The expected value and average value are very close. While this doesn't give much information about each individual outcome, it does tell us that the average for all of the trials was close to esolutions Manual - Powered by Cognero Page 1

2 what was expected to happen. Design and conduct a simulation using a geometric probability model. Then report the results using appropriate numerical and graphical summaries. 5. VIDEO GAMES Ian works at a video game store. Last year he sold 95% of the new-release video games. One option would be to create a spinner. Use a spinner that is divided into two sectors, one containing 95% or 342 and the other containing 5% or BOARD GAMES Pilar is playing a board game with eight different categories, each with questions that must be answered correctly in order to win. Sample answer: Use a spinner that is divided into 8 equal sectors, each 45. Another option would be to use a random number generator from 1-8 where each value represents a different category. Do 50 trials and record the results in a frequency Or you could use a random number generator to generate integers 1 through 20 where 1 19 represents a sale and 20 represents a no-sale. We could generate the integers and let represent a no-sale. Do 50 trials and record the results in a frequency Divide the frequency by 50 to find each corresponding probability. Divide each frequency by 50 to find the corresponding probability. The probability of landing on Categories 1 and 2 is 0.06, Category 3 is 0.12, Category 4 is 0.26, Category 5 is 0.08, Category 6 is 0.18, Category 7 is 0.14, and Category 8 is 0.1. The probability of Ian selling a game is The probability of not selling a game is or esolutions Manual - Powered by Cognero Page 2

3 CCSS MODELING Design and conduct a simulation using a random number generator. Then report the results using appropriate numerical and graphical summaries. 9. BASEBALL According to a baseball player s onbase percentages, he gets a single 60% of the time, a double 25% of the time, a triple 10% of the time, and a home run 5% of the time. Use a random number generator. Since the values are given in percents, we could generate the integers and let 1-60 represent a single, represent a double, represent a triple, and represent a home run. Simply use the first 60 to represent 60%, the next 25, or 61-85, to represent 25%, and so on. We could also divide all of these values by 5 and generate the integers TRANSPORTATION A car dealership's analysis indicated that 35% of the customers purchased a blue car, 30% purchased a red car, 15% purchased a white car, 15% purchased a black car, and 5% purchased any other color. Use a random number generator. Since the values are given in multiples of 5%, we could generate the integers 1-20 and let 1-7 represents blue, 8-13 represents red, represents white, represents black, and 20 represents all other colors. Do 50 trials and record the results in a frequency Do 20 trials and record the results in a frequency Divide each frequency by 20 to get the corresponding probability. Divide each frequency by 50 to get the corresponding probability. The probability of the baseball player hitting a single is 0.65, a double is 0.2, a triple is 0.1, and a home run is The probability of a customer buying a blue car is 0.34, buying a red car is 0.28, buying a black car is 0.14, buying a white car is 0.2, and any other color is DARTBOARDS The dimensions of each dartboard below are given in inches. There is only one shot per game. Calculate the expected value of each dart game. Then design a esolutions Manual - Powered by Cognero Page 3

4 simulation to estimate each game s average value. Compare the average and expected values. Sample answer: 13. Find the geometric probability of red, blue and white regions. The area of the big circle is 25π. The area of the red circle is 0.25π. The expected value is greater than the average value. Now run a simulation and calculate the average value. esolutions Manual - Powered by Cognero Page 4

5 15. CARDS You are playing a team card game where a team can get 0 points, 1 point, or 3 points for a hand. The probability of your team getting 1 point for a hand is 60% and of getting 3 points for a hand is 5%. a. Calculate your team s expected value for a hand. b. Design a simulation and estimate your team s average value per hand. c. Compare the values for parts a and b. 17. BASEBALL Of his pitches thrown for strikes, a baseball pitcher wants to track which areas of the strike zone have a higher probability. He divides the strike zone into six congruent boxes as shown. a. The expected value is the sum of the product of each point value and its corresponding probability. a. If a strike is equally likely to hit each box, what is the probability that he will throw a strike in each box? b. Design a simulation to estimate the probability of a strike being thrown in each box. c. Compare the values for parts a and b. b. Sample answer: Use a random number generator to generate integers 1 through 20, where 1 7 represents 0 points, 8 19 represents 1 point, and 20 represents 3 points. Do 50 trials and record the results in a frequency The average value is the sum of the product of each point value and its corresponding frequency. a. Total number of congruent boxes = 6 There is a strike in each box. or 16.7% probability of throwing a b. Sample answer: Since there are six equal outcomes, a die with the numbers 1 through 6 can be rolled to simulate each strike that is thrown. Roll the die 100 times and record the number on the die to indicate in which of the six boxes each strike was thrown. Record the percent of times a strike is thrown in each area. c. Sample answer: The two values are almost equal. c. Sample answer: Some of the values are higher or lower, but most are very close to 16.7%. 19. MULTIPLE REPRESENTATIONS In this problem, you will investigate expected value. a. CONCRETE Roll two dice 20 times and record esolutions Manual - Powered by Cognero Page 5

6 the sum of each roll. b. NUMERICAL Use the random number generator on a calculator to generate 20 pairs of integers between 1 and 6. Record the sum of each pair. c. TABULAR Copy and complete the table below using your results from parts a and b. d. Enter the data values into L1 of your calculator. Produce the bar graph. Sample answer: d. GRAPHICAL Use a bar graph to graph the number of times each possible sum occurred in the first 5 rolls. Repeat the process for the first 10 rolls and then all 20 outcomes. e. VERBAL How does the shape of the bar graph change with each additional trial? f. GRAPHICAL Graph the number of times each possible sum occurred with the random number generator as a histogram. g. VERBAL How do the graphs of the die trial and the random number trial compare? h. ANALYTICAL Based on the graphs, what do you think the expected value of each experiment would be? Explain your reasoning. a. Sample answer: 9, 10, 6, 6, 7, 9, 5, 9, 7, 6, 5, 7, 3, 9, 7, 6, 7, 8, 7 b. Sample answer: 4, 10, 5, 10, 6, 7, 12, 3, 7, 4, 7, 9, 3, 6, 4, 11, 5, 7, 5, 3 c. Transfer the values from parts a and b. Sample answer: esolutions Manual - Powered by Cognero Page 6

8 27. ALGEBRA Paul collects comic books. He has 20 books in his collection, and he adds 3 per month. In how many months will he have a total of 44 books in his collection? F 5 G 6 H 8 J 15 Let x be the number of months required to collect 44 books. Point X is chosen at random on probability of each event. 31. P(X is on ) Find the The correct choice is H. 29. SAT/ACT If a jar contains 150 peanuts and 60 cashews, what is the approximate probability that a nut selected from the jar at random will be a cashew? A 0.25 B 0.29 C 0.33 D 0.4 E 0.71 There are 60 outcomes in which a cashew can be chosen and 150 total cashews. The probability of selecting a cashew is = Find the surface area of each figure. Round to the nearest tenth. The surface area S of a sphere is S = 4πr 2, where r is the radius. The radius is 2 ft. 35. The surface area S of a sphere is S = 4πr 2, where r is the radius. esolutions Manual - Powered by Cognero Page 8

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