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MATH 221 Week 4 Homework: Statistics for Decision-Making (May 20201)
  1. Question: The length of time a person takes to decide which shoes to purchase is normally distributed with a mean of 8.54 minutes and a standard deviation of 1.91. Find the probability that a randomly selected individual will take less than 5 minutes to select a shoe purchase. Is this outcome unusual?
  2. Question: In a health club, research shows that on average, patrons spend an average of 42.5 minutes on the treadmill, with a standard deviation of 4.8 minutes. It is assumed that this is a normally distributed variable. Find the probability that randomly selected individuals would spent between 30 and 40 minutes on the
  3. Question: A tire company measures the tread on newly-produced tires and finds that they are normally distributed with a mean depth of 0.98mm and a standard deviation of 0.35mm. Find the probability that a randomly selected tire will have a depth of less than 0.50mm. Would this outcome warrant a refund (meaning that it would be unusual)?
  4. Question: In an agricultural study, the average amount of corn yield is normally distributed with a mean of 185.2 bushels of corn per acre, with a standard deviation of 23.5 bushels of corn. If a study included 1200 acres, how many would be expected to yield more than 206 bushels of corn per acre?
  5. Question: On average, the parts from a supplier have a mean of 35.8 inches and a standard deviation of 2.4 inches. Find the probability that a randomly selected part from this supplier will have a value between 28.6 and 43.0 inches. Is this consistent with the Empirical Rule of 68%-95%-99.7%?
  6. Question: A process is normally distributed with a mean of 10.2 hits per minute and a standard deviation of 1.04 hits. If a randomly selected minute has 12.9 hits, would the process … in control or out of control?
  7. Question: The candy produced by a company has a sugar level that is normally distributed with a mean of 16.8 grams and a standard deviation of 0.9 grams. The company takes readings of every 10th bar off the production line. The reading points are 17.3, 14.9, 18.3, 16.5, 16.1, 17.4, 19.4. Is the process in control or out of control and why?
  8. Question: The toasters produced by a company have a normal… life span with a mean of 5.8 years and a standard deviation of 0.9 years, what warranty should … so that the company is replacing at most 10% of their toasters sold?
  9. Question: A running shoe company wants to sponsor the fastest 5% of runners. You know that in this race, the running times are normally distributed with a mean of 7.2 minutes and a standard deviation of 0.56 minutes. How fast would you need to run to … by the company?
  10. Question: A stock’s price fluctuations are approximately normal… with a mean of $26.94 and a standard deviation of $3.54. You decide to sell whenever the price reaches its highest 10% of value. What is the highest value you would still hold the stock?
  11. Question: In a survey of first graders, their mean height was 49.5 inches with a standard deviation of 3.6 inches. Assuming the heights are normally … , what height represents the first quartile of these students?
  12. Question: Hospital waiting room times are normally distributed with a mean of 38.12 minutes and a standard deviation of 8.63 minutes. What is the shortest wait time that would still be in the worst 10% of wait times?
  13. Question: The length of timber cuts are normally … with a mean of 95 inches and a standard deviation of 0.52 inches. In a random sample of 30 boards, what is the probability that the mean of the sample will be between 94.8 inches and 95.8 inches?
  14. Question: Of all the companies on the New York Stock Exchange, profits are normally … with a mean of $6.54 million and a standard deviation of $10.45 million. In a random sample of 73 companies from the NYSE, what is the probability that the mean profit for the sample was between -2.9 million and 4.5 million?
  15. Question: Doing research for insurance rates, it is found that those aged 30 to 49 drive an average of 38.7 miles per day with a standard deviation of 6.7 miles. These distances are normally … If a group of 60 drivers in that age group are randomly selected, what is the probability that the mean distance traveled each day is between 29.9 miles and 39.9 miles?

 

MATH 221 Week 4 Homework: Statistics for Decision-Making (v1)
  1. Question: The length of time a person takes to decide which shoes to purchase is normally … with a mean of 8.54 minutes and a standard deviation of 1.91. Find the probability that a randomly … individual will take less than 5 minutes to select a shoe purchase. Is this outcome unusual?
  2. Question: Monthly water bills for a city have a mean of $108.43 and a standard deviation of $36.98. Find the probability that a random… bill will have an amount greater than $165, which the city believes might indicate that someone is wasting water. Would a bill that size … unusual?
  3. Question: In a health club, research shows that on average, patrons spend an average of 46.2 minutes on the treadmill, with a standard deviation of 4.8 minutes. It is assumed that this is a normally … variable. Find the probability that randomly … individual would spend between 30 and 40 minutes on the treadmill.
  4. Question: A tire company measures the tread on newly-produced tires and finds that they are normally … with a mean depth of 0.98mm and a standard deviation of 0.35mm. Find the probability that a randomly … tire will have a depth less than 0.70mm. Would this outcome warrant a refund (meaning that it would … unusual)?
  5. Question: A grocery store studies how long it takes customers to get through the speed check lane. They assume that if it takes more than 10 minutes, the customer will … upset. Find the probability that a randomly … customer takes more than 10 minutes if the average is 7.45 minutes with a standard deviation of 1.52 minutes.
  6. Question: In an agricultural study, the average amount of corn yield is normally … with a mean of 185.2 bushels of corn per acre, with a standard deviation of 23.5 bushels of corn. If a study … 1100 acres, how many would … to yield more than 190 bushels of corn per acre?
  7. Question: On average, the parts from a supplier have a mean of 31.8 inches and a standard deviation of 2.4 inches. Find the probability that a randomly … part from this supplier will have a value between 27.0 and 36.6 inches. Is this consistent with the Empirical Rule of 68%-95%-99.7%?
  8. Question: A process is normally … with a mean of 10.6 hits per minute and a standard deviation of 0.49 hits. If a randomly … minute has 11.8 hits, would the process … in control or out of control?
  9. Question: The candy produced by a company has a sugar level that is normally … with a mean of 16.8 grams and a standard deviation of 0.9 grams. The company takes readings of every 10th bar off the production line. The reading points are 17.3, 14.9, 18.8, 16.5, 16.1, 17.4, 19.4. Is the process in control or out of control and why?
  10. Question: The toasters produced by a company have a normal… life span with a mean of 5.8 years and a standard deviation of 0.9 years, what warranty should … provided so that the company is replacing at most 4% of their toasters sold?
  11. Question: A running shoe company wants to sponsor the fastest 5% of runners. You know that in this race, the running times are normally … with a mean of 6.8 minutes and a standard deviation of 0.37 minutes. How fast would you need to run to … sponsored by the company?
  12. Question: The weights of bags of peas are normally … with a mean of 13.50 ounces and a standard deviation of 1.06 ounces. Bags in the upper 5% are too heavy and must … repackaged. What are the most that a bag can weigh and not need to … repackaged?
  13. Question: A stock’s price fluctuations are approximately normal… with a mean of $26.94 and a standard deviation of $3.54. You decide to sell whenever the price reaches its highest 20% of value. What is the highest value you would still hold the stock?
  14. Question: In a survey of first graders, their mean height was 50.4 inches with a standard deviation of 3.55 inches. Assuming the heights are normally … , what height represents the first quartile of these students?
  15. Question: Hospital waiting room times are normally … with a mean of 38.12 minutes and a standard deviation of 8.63 minutes. What is the shortest wait time that would still … in the worst 5% of wait times?
  16. Question: A machine set to fill soup cans with a mean of 20 ounces and a standard deviation of 0.11 ounces. A random sample of 22 cans has a mean of 20.04 ounces. Should the machine … reset?
  17. Question: The length of timber cuts are normally … with a mean of 95 inches and a standard deviation of 0.52 inches. In a random sample of 45 boards, what is the probability that the mean of the sample will … between 94.8 inches and 95.8 inches?
  18. Question: The Dow Jones Industrial Average has had a mean gain of 432 per year with a standard deviation of 722. A random sample of 40 years is … What is the probability that the mean gain for the sample was between 200 and 550?
  19. Question: Of all the companies on the New York Stock Exchange, profits are normally … with a mean of $6.54 million and a standard deviation of $10.45 million. In a random sample of 73 companies from the NYSE, what is the probability that the mean profit for the sample was between 3 million and 6 million?
  20. Question: Doing research for insurance rates, it is found that those aged 30 to 49 drive an average of 38.7 miles per day with a standard deviation of 6.7 miles. These distances are normally … If a group of 60 drivers in that age group is randomly …, what is the probability that the mean distance … each day is between 29.9 miles and 39.9 miles?

MATH-221 Week 4 Homework: Statistics for Decision-Making (v2)
  1. Question: The length of time a person takes to decide which shoes to purchase is normally … with a mean of 8.54 minutes and a standard deviation of 1.91. Find the probability that a randomly … individual will take less than 6 minutes to select a shoe purchase. Is this outcome unusual?
  2. Question: Monthly water bills for a city have a mean of $108.43 and a standard deviation of $36.98. Find the probability that a random… bill will have an amount greater than $165, which the city believes might indicate that someone is wasting water. Would a bill that size … unusual?
  3. Question: In a health club, research shows that on average, patrons spend an average of 46.2 minutes on the treadmill, with a standard deviation of 4.8 minutes. It is assumed that this is a normal… variable. Find the probability that randomly … individual would spend between 30 and 40 minutes on the treadmill.
  4. Question: A tire company measures the tread on newly-produced tires and finds that they are normally … with a mean depth of 0.98mm and a standard deviation of 0.35mm. Find the probability that a randomly … tire will have a depth less than 0.70mm. Would this outcome warrant a refund (meaning that it would … unusual)?
  5. Question: A grocery store studies how long it takes customers to get through the speed check lane. They assume that if it takes more than 10 minutes, the customer will … upset. Find the probability that a randomly … customer takes more than 10 minutes if the average is 7.45 minutes with a standard deviation of 1.52 minutes.
  6. Question: In an agricultural study, the average amount of corn yield is normally … with a mean of 185.2 bushels of corn per acre, with a standard deviation of 23.5 bushels of corn. If a study included 1200 acres, how many would … yield more than 206 bushels of corn per acre?
  7. Question: On average, the parts from a supplier have a mean of 35.8 inches and a standard deviation of 2.4 inches. Find the probability that a randomly … part from this supplier will have a value between 31.0 and 40.6 inches. Is this consistent with the Empirical Rule of 68%-95%-99.7%?
  8. Question: A process is normally … with a mean of 10.6 hits per minute and a standard deviation of 0.49 hits. If a randomly … minute has 12.3 hits, would the process … in control or out of control?
  9. Question: The candy produced by a company has a sugar level that is normally … with a mean of 16.8 grams and a standard deviation of 0.9 grams. The company takes readings of every 10 bars off the production line. The reading points are 17.3, 14.9, 18.8, 16.5, 16.1, 17.4, and 19.4. Is the process in control or out of control and why?
  10. Question: The toasters produced by a company have a normal… life span with a mean of 5.8 years and a standard deviation of 0.9 years, what warranty should … provided so that the company is replacing at most 10% of their toasters sold?
  11. Question: A running shoe company wants to sponsor the fastest 3% of runners. You know that in this race, the running times are normally … with a mean of 7.2 minutes and a standard deviation of 0.56 minutes. How fast would you need to run to … sponsored by the company?
  12. Question: The weights of bags of peas are normally … with a mean of 13.50 ounces and a standard deviation of 1.06 ounces. Bags in the upper 5% are too heavy and must … repackaged. What are the most that a bag can weigh and not need to … repackaged?
  13. Question: A stock’s price fluctuations are approximately normal… with a mean of $26.94 and a standard deviation of $3.54. You decide to sell whenever the price reaches its highest 10% of value. What is the highest value you would still hold the stock?
  14. Question: In a survey of first graders, their mean height was 50.4 inches with a standard deviation of 3.55 inches. Assuming the heights are normally … , what height represents the first quartile of these students?
  15. Question: Hospital waiting room times are normally … with a mean of 38.12 minutes and a standard deviation of 8.63 minutes. What is the shortest wait time that would still … in the worst 5% of wait times?
  16. Question: A machine set to fill soup cans with a mean of 20 ounces and a standard deviation of 0.11 ounces. A random sample of 15 cans has a mean of 20.04 ounces. Should the machine … reset?
  17. Question: The length of timber cuts are normally … with a mean of 95 inches and a standard deviation of 0.52 inches. In a random sample of 45 boards, what is the probability that the mean of the sample will … between 94.8 inches and 95.8 inches?
  18. Question: The Dow Jones Industrial Average has had a mean gain of 432 per year with a standard deviation of 722. A random sample of 40 years is … What is the probability that the mean gain for the sample was between 200 and 550?
  19. Question: Of all the companies on the New York Stock Exchange, profits are normally … with a mean of $6.54 million and a standard deviation of $10.45 million. In a random sample of 73 companies from the NYSE, what is the probability that the mean profit for the sample was between 0 million and 5.1 million?
  20. Question: Doing research for insurance rates, it is found that those aged 30 to 49 drive an average of 38.7 miles per day with a standard deviation of 6.7 miles. These distances are normally …. If a group of 60 drivers in that age group is randomly …, what is the probability that the mean distance … each day is between 29.9 miles and 39.9 miles?

MATH 221 Week 4 Homework: Statistics for Decision-Making (v3)
  1. Question: The length of time a person takes to decide which shoes to purchase is normally … with a mean of 8.54 minutes and a standard deviation of 1.91. Find the probability that a randomly … individual will take less than 6 minutes to select a shoe purchase. Is this outcome unusual?
  2. Question: Monthly water bills for a city have a mean of $108.43 and a standard deviation of $36.98. Find the probability that a random… bill will have an amount greater than $165, which the city believes might indicate that someone is wasting water. Would a bill that size … unusual?
  3. Question: In a health club, research shows that on average, patrons spend an average of 46.2 minutes on the treadmill, with a standard deviation of 4.8 minutes. It is assumed that this is a normal… variable. Find the probability that randomly… individual would spend between 30 and 40 minutes on the treadmill.
  4. Question: A tire company measures the tread on newly-produced tires and finds that they are normally … with a mean depth of 0.99mm and a standard deviation of 0.35mm. Find the probability that a randomly … tire will have a depth less than 0.31mm. Would this outcome warrant a refund (meaning that it would … unusual)?
  5. Question: A grocery store studies how long it takes customers to get through the speed check lane. They assume that if it takes more than 10 minutes, the customer will … upset. Find the probability that a randomly …  customer takes more than 10 minutes if the average is 8.56 minutes with a standard deviation of 1.04 minutes.
  6. Question: In an agricultural study, the average amount of corn yield is normally … with a mean of 185.2 bushels of corn per acre, with a standard deviation of 23.5 bushels of corn. If a study … 1200 acres, how many would … to yield more than 190 bushels of corn per acre?
  7. Question: On average, the parts from a supplier have a mean of 35.8 inches and a standard deviation of 2.4 inches. Find the probability that a randomly … part from this supplier will have a value between 31.0 and 40.6 inches. Is this consistent with the Empirical Rule of 68%-95%-99.7%?
  8. Question: A process is normally … with a mean of 10.2 hits per minute and a standard deviation of 1.04 hits. If a randomly … minute has 12.9 hits, would the process … in control or out of control?
  9. Question: The candy produced by a company has a sugar level that is normally … with a mean of 16.8 grams and a standard deviation of 0.9 grams. The company takes readings of every 10th bar off the production line. The reading points are 17.3, 14.9, 18.8, 16.5, 16.1, 17.4, 19.4. Is the process in control or out of control and why?
  10. Question: The toasters produced by a company have a normal… life span with a mean of 5.8 years and a standard deviation of 0.9 years, what warranty should … provided so that the company is replacing at most 5% of their toasters sold?
  11. Question: A running shoe company wants to sponsor the fastest 3% of runners. You know that in this race, the running times are normally … with a mean of 7.2 minutes and a standard deviation of 0.56 minutes. How fast would you need to run to … sponsored by the company?
  12. Question: The weights of bags of peas are normally … with a mean of 12.08 ounces and a standard deviation of 1.03 ounces. Bags in the upper 5% are too heavy and must … repackaged. What are the most that a bag can weigh and not need to … repackaged?
  13. Question: A stock’s price fluctuations are approximately normal… with a mean of $29.51 and a standard deviation of $3.87. You decide to sell whenever the price reaches its highest 10% of value. What is the highest value you would still hold the stock?
  14. Question: In a survey of first graders, their mean height was 51.6 inches with a standard deviation of 3.6 inches. Assuming the heights are normally …, what height represents the first quartile of these students?
  15. Question: Hospital waiting room times are normally … with a mean of 38.12 minutes and a standard deviation of 8.63 minutes. What is the shortest wait time that would still … in the worst 10% of wait times?
  16. Question: A machine set to fill soup cans with a mean of 20 ounces and a standard deviation of 0.1 ounces. A random sample of 34 cans has a mean of 20.02 ounces. Should the machine … reset?
  17. Question: The length of timber cuts are normally … with a mean of 95 inches and a standard deviation of 0.52 inches. In a random sample of 45 boards, what is the probability that the mean of the sample will … between 94.8 inches and 95.8 inches?
  18. Question: The Dow Jones Industrial Average has had a mean gain of 432 per year with a standard deviation of 722. A random sample of 40 years is … What is the probability that the mean gain for the sample was between 250 and 550?
  19. Question: Of all the companies on the New York Stock Exchange, profits are normally … with a mean of $6.54 million and a standard deviation of $10.45 million. In a random sample of 73 companies from the NYSE, what is the probability that the mean profit for the sample was between 0 million and 5.1 million?
  20. Question: Doing research for insurance rates, it is found that those aged 30 to 49 drive an average of 38.7 miles per day with a standard deviation of 6.7 miles. These distances are normally … If a group of 60 drivers in that age group is randomly …, what is the probability that the mean distance … each day is between 32.5 miles and 40.5 miles?

MATH-221 Week 4 Homework: Statistics for Decision-Making (v4)
  1. Question: The length of time a person takes to decide which shoes to purchase is normally … with a mean of 8.54 minutes and a standard deviation of 1.91. Find the probability that a randomly … individual will take less than 5 minutes to select a shoe purchase. Is this outcome unusual?
  2. Question: Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. Find the probability that a random… bill will have an amount greater than $165, which the city believes might indicate that someone is wasting water. Would a bill that size … unusual?
  3. Question: In a health club, research shows that on average, patrons spend an average of 42.5 minutes on the treadmill, with a standard deviation of 4.8 minutes. It is assumed that this is a normal… variable. Find the probability that randomly … individual would spend between 30 and 40 minutes on the treadmill.
  4. Question: A tire company measures the tread on newly-produced tires and finds that they are normally … with a mean depth of 0.99mm and a standard deviation of 0.35mm. Find the probability that a randomly … tire will have a depth less than 0.31mm. Would this outcome warrant a refund (meaning that it would … unusual)?
  5. A grocery stores study how long it takes customers to get through the speed check lane. They assume that if it takes more than 10 minutes, the customer will … upset. Find the probability that a randomly … customer takes more than 10 minutes if the average is 7.45 minutes with a standard deviation of 2.81 minutes.
  6. Question: In an agricultural study, the average amount of corn yield is normally … with a mean of 185.2 bushels of corn per acre, with a standard deviation of 23.5 bushels of corn. If a study included 1100 acres, how many would … yield more than 190 bushels of corn per acre?
  7. Question: On average, the parts from a supplier have a mean of 35.8 inches and a standard deviation of 2.4 inches. Find the probability that a randomly … part from this supplier will have a value between 28.6 and 43.0 inches. Is this consistent with the Empirical Rule of 68%-95%-99.7%?
  8. Question: A process is normally … with a mean of 10.6 hits per minute and a standard deviation of 0.49 hits. If a randomly … minute has 12.3 hits, would the process … in control or out of control?
  9. Question: The candy produced by a company has a sugar level that is normally … with a mean of 16.8 grams and a standard deviation of 0.7 grams. The company takes readings of every 10 bars off the production line. The reading points are 17.3, 14.9, 18.3, 16.5, 16.1, 17.4, 18.4. Is the process in control or out of control and why?
  10. Question: The toasters produced by a company have a normal… life span with a mean of 5.8 years and a standard deviation of 0.9 years, what warranty should … provided so that the company is replacing at most 3% of their toasters sold?
  11. Question: A running shoe company wants to sponsor the fastest 3% of runners. You know that in this race, the running times are normally … with a mean of 7.2 minutes and a standard deviation of 0.56 minutes. How fast would you need to run to … sponsored by the company?
  12. Question: The weights of bags of peas are normally… with a mean of 13.50 ounces and a standard deviation of 1.06 ounces. Bags in the upper 5% are too heavy and must … repackaged. What are the most that a bag can weigh and not need to … repackaged?
  13. Question: A stock’s price fluctuations are approximately normal… with a mean of $26.94 and a standard deviation of $3.54. You decide to sell whenever the price reaches its highest 10% of value. What is the highest value you would still hold the stock?
  14. Question: In a survey of first graders, their mean height was 49.5 inches with a standard deviation of 3.6 inches. Assuming the heights are normally …, what height represents the first quartile of these students?
  15. Question: Hospital waiting room times are normally … with a mean of 38.12 minutes and a standard deviation of 8.63 minutes. What is the shortest wait time that would still … in the worst 10% of wait times?
  16. Question: A machine set to fill soup cans with a mean of 20 ounces and a standard deviation of 0.1 ounces. A random sample of 28 cans has a mean of 20.04 ounces. Should the machine … reset?
  17. Question: The length of timber cuts are normally … with a mean of 95 inches and a standard deviation of 0.52 inches. In a random sample of 45 boards, what is the probability that the mean of the sample will … between 94.8 inches and 95.8 inches?
  18. Question: The Dow Jones Industrial Average has had a mean gain of 432 per year with a standard deviation of 722. A random sample of 40 years is … . What is the probability that the mean.

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