MATH 221N Week 3 Homework (Version 1)

1. Question: Let x represent the length of cars in a parking lot. This would be considered what type of variable:
2. Question: Let x represent the inches of rain on crops in Akron, Ohio. This would be considered what type of variable:
3. Question: Consider the following table.  If you created the probability distribution for these data, what would be the probability of 30-39?
4. Question: Consider the following table.  Find the mean of this variable.
5. Question: Consider the following table. Find the variance of this variable.
6. Question: Consider the following table. Find the standard deviation of this variable.
7. Question: Ten frequent gamers are randomly selected. The random variable represents the number of frequent gamers who play video games on their smartphones. For this to be a binomial experiment, what assumption needs to be made?
8. Question: A survey found that 31% of all teens buy soda (pop) at least once each week. Seven teens are randomly selected. The random variable represents the number of teens who buy soda (pop) at least once each week. What is the value of n?
9. Question: Thirty-five percent of US adults have little confidence in their cars. You randomly select ten US adults. Find the probability that the number of US adults who have little confidence in their cars is (1) exactly six and then find the probability that it is (2) more than 7.
10. Question: Eight baseballs are randomly selected from the production line to see if their stitching is straight. Over time, the company has found that 93.8% of all their baseballs have straight stitching. If exactly six of the eight have straight stitching, should the company stop the production line?
11. Question: A supplier must create metal rods that are 16.4 inches long to fit into the next step of production. Can a binomial experiment be used to determine the probability that the rods are too long, too short, or about right?
12. Question: In a box of 12 tape measures, there is one that does not work. Employees take tape measures as needed and returned after use. You are the 9^th employee to take a tape measure. Is this a binomial experiment?
13. Question: Fifty-three percent of employees make judgements about their co-workers based on the cleanliness of their desk. You randomly select 8 employees and ask them if they judge co-workers based on this criterion. The random variable is the number of employees who judge their co-workers by cleanliness. Which outcomes of this binomial distribution would be considered unusual?
14. Question: The probability of a potential employee passing a drug test is 90%. If you selected 11 potential employees and gave them a drug test, how many would you expect to pass the test?
15. Question: Off the production line, there is a 3.7% chance that a candle is defective. If the company selected 45 candles off the line, what is the probability that fewer than 3 would be defective?

MATH 221N Week 3 Homework (Version 2)

1. Question: Let x represent the number of pets in pet stores. This would be considered what type of variable:
2. Question: Let x represent the number of players on a sports field. This would be considered what type of variable:
3. Question: Consider the following table. If you created the probability distribution for these data, what would be the probability of 40-49?
4. Question: Consider the following table. Find the mean of this variable.
5. Question: Consider the following table. Find the variance of this variable.
6. Question: Consider the following table. Find the standard deviation of this variable.
7. Question: Fifteen golfers are randomly selected. The random variable represents the number of golfers who only play on the weekends. For this to be a binomial experiment, what assumption needs to be made?
8. Question: A survey found that 75% of all golfers play golf on the weekend. Eighteen golfers are randomly selected. The random variable represents the number of golfers that play on the weekends. What is the value of p?
9. Question: Fifty-nine percent of US adults have little confidence in their cars. You randomly select eight US adults. Find the probability that the number of US adults who have little confidence in their cars is (1) exactly three and then find the probability that it is (2) more than 6.
10. Question: Seven baseballs are randomly selected from the production line to see if their stitching is straight. Over time, the company has found that 89.4% of all their baseballs have straight stitching. If exactly five of the seven have straight stitching, should the company stop the production line?
11. Question: A supplier must create metal rods that are 18.1 inches long to fit into the next step of production. Can a binomial experiment be used to determine the probability that the rods are correct length or an incorrect length?
12. Question: In a box of 12 tape measures, there is one that does not work. Employees take tape measures as needed and returned after use. You are the 9^th employee to take a tape measure. Is this a binomial experiment?
13. Question: Fifty-three percent of employees make judgements about their co-workers based on the cleanliness of their desk. You randomly select 8 employees and ask them if they judge co-workers based on this criterion. The random variable is the number of employees who judge their co-workers by cleanliness. Which outcomes of this binomial distribution would be considered unusual?
14. Question: The probability of a potential employee passing a drug test is 86%. If you selected 12 potential employees and gave them a drug test, how many would you expect to pass the test?
15. Question: Off the production line, there is a 4.6% chance that a candle is defective. If the company selected 50 candles off the line, what is the standard deviation of the number of defective candles in the group?

MATH 221N Week 3 Homework (Version 3)

1. Question: Let x represent the number of pets in pet stores. This would be considered what type of variable:
2. Question: Let x represent the height of corn in Oklahoma. This would be considered what type of variable:
3. Question: Consider the following table. If you created the probability distribution for these data, what would be the probability of 60-69?
4. Question: Consider the following table. Find the mean of this variable.
5. Question: Consider the following table. Find the variance of this variable.
6. Question: Consider the following table. Find the standard deviation of this variable.
7. Question: Ten frequent gamers are randomly selected. The random variable represents the number of frequent gamers who play video games on their smartphones. For this to be a binomial experiment, what assumption needs to be made?
8. Question: A survey found that 39% of all gamers play video games on their smartphones. Ten frequent gamers are randomly selected. The random variable represents the number of frequent games who play video games on their smartphones. What is the value of p?
9. Question: Forty-four percent of US adults have little confidence in their cars. You randomly select twelve US adults. Find the probability that the number of US adults who have little confidence in their cars is (1) exactly six and then find the probability that it is (2) more than 7.
10. Question: Seven baseballs are randomly selected from the production line to see if their stitching is straight. Over time, the company has found that 89.4% of all their baseballs have straight stitching. If exactly five of the seven have straight stitching, should the company stop the production line?
11. Question: A supplier must create metal rods that are 16.4 inches long to fit into the next step of production. Can a binomial experiment be used to determine the probability that the rods are too long, too short, or about right?
12. Question: In a box of 12 pens, there is one that does not work. Employees take pens as needed. The pens are not returned, once taken. You are the 5^th employee to take a pen. Is this a binomial experiment?
13. Question: Fifty-three percent of employees make judgements about their co-workers based on the cleanliness of their desk. You randomly select 8 employees and ask them if they judge co-workers based on this criterion. The random variable is the number of employees who judge their co-workers by cleanliness. Which outcomes of this binomial distribution would be considered unusual?
14. Question: The probability of a potential employee passing a drug test is 90%. If you selected 11 potential employees and gave them a drug test, how many would you expect to pass the test?
15. Question: Off the production line, there is a 3.7% chance that a candle is defective. If the company selected 45 candles off the line, what is the standard deviation of the number of defective candles in the group?

MATH 221N Week 3 Homework (Version 4)

1. Question: Let x represent the number of pets in pet stores. This would be considered what type of variable:
2. Question: Let x represent the height of corn in Oklahoma. This would be considered what type of variable:
3. Question: Consider the following table. If you created the probability distribution for these data, what would be the probability of 60-69?
4. Question: Consider the following table. Find the mean of this variable.
5. Question: Consider the following table. Find the variance of this variable.
6. Question: Consider the following table. Find the standard deviation of this variable.
7. Question: Ten frequent gamers are randomly selected. The random variable represents the number of frequent gamers who play video games on their smartphones. For this to be a binomial experiment, what assumption needs to be made?
8. Question: A survey found that 39% of all gamers play video games on their smartphones. Ten frequent gamers are randomly selected. The random variable represents the number of frequent games who play video games on their smartphones. What is the value of p?
9. Question: Forty-four percent of US adults have little confidence in their cars. You randomly select twelve US adults. Find the probability that the number of US adults who have little confidence in their cars is (1) exactly six and then find the probability that it is (2) more than 7.
10. Question: Eleven baseballs are randomly selected from the production line to see if their stitching is straight. Over time, the company has found that 98.3% of all their baseballs have straight stitching. If exactly nine of the eleven have straight stitching, should the company stop the production line?
11. Question: A supplier must create metal rods that are 2.1 inches width to fit into the next step of production. Can a binomial experiment be used to determine the probability that the rods are too wide, too narrow, or about right?
12. Question: In a box of 12 pens, there is one that does not work. Employees take pens as needed. The pens are not returned, once taken. You are the 5^th employee to take a pen. Is this a binomial experiment?
13. Question: Forty-two percent of employees make judgements about their co-workers based on the cleanliness of their desk. You randomly select 7 employees and ask them if they judge co-workers based on this criterion. The random variable is the number of employees who judge their co-workers by cleanliness. Which outcomes of this binomial distribution would be considered unusual?
14. Question: The probability of a potential employee passing a drug test is 90%. If you selected 11 potential employees and gave them a drug test, how many would you expect to pass the test?
15. Question: Off the production line, there is a 3.7% chance that a candle is defective. If the company selected 45 candles off the line, what is the standard deviation of the number of defective candles in the group?

MATH 221N Week 3 Homework (Version 5)

1. Question: Let x represent the height of first graders in a class. This would be considered what type of variable:
2. Question: Let x represent the number of players on a sports field. This would be considered what type of variable:
3. Question: Consider the following table. If you created the probability distribution for these data, what would be the probability of 30-39?
4. Question: Consider the following table. Find the mean of this variable.
5. Question: Consider the following table. Find the variance of this variable.
6. Question: Consider the following table. Find the standard deviation of this variable.
7. Question: Ten fourth graders are randomly selected. The random variable represents the number of fourth graders who own a smartphone. For this to be a binomial experiment, what assumption needs to be made?
8. Question: A survey found that 39% of all gamers play video games on their smartphones. Ten frequent gamers are randomly selected. The random variable represents the number of frequent games who play video games on their smartphones. What is the value of n?
9. Question: Fifty-nine percent of US adults have little confidence in their cars. You randomly select eight US adults. Find the probability that the number of US adults who have little confidence in their cars is (1) exactly three and then find the probability that it is (2) more than 6.
10. Question: Eleven baseballs are randomly selected from the production line to see if their stitching is straight. Over time, the company has found that 87.6% of all their baseballs have straight stitching. If exactly seven of the eleven have straight stitching, should the company stop the production line?
11. Question: A supplier must create metal rods that are 2.3 inches width to fit into the next step of production. Can a binomial experiment be used to determine the probability that the rods are the correct width or an incorrect width?
12. Question: In a box of 12 tape measures, there is one that does not work. Employees take tape measures as needed and returned after use. You are the 9^th employee to take a tape measure. Is this a binomial experiment?
13. Question: Fifty-three percent of employees make judgements about their co-workers based on the cleanliness of their desk. You randomly select 8 employees and ask them if they judge co-workers based on this criterion. The random variable is the number of employees who judge their co-workers by cleanliness. Which outcomes of this binomial distribution would be considered unusual?
14. Question: The probability of a potential employee passing a drug test is 86%. If you selected 12 potential employees and gave them a drug test, how many would you expect to pass the test?
15. Question: Off the production line, there is a 2.2% chance that a candle is defective. If the company selected 40 candles off the line, what is the standard deviation of the number of defective candles in the group?

MATH 221 Week 3 Homework (Version 6)

1. Question: Let x represent the number of cars in a parking lot. This would be considered what type of variable:
2. Question: Let x represent the inches of rain on crops in Akron, Ohio. This would be considered what type of variable:
3. Question: Consider the following table. If you created the probability distribution for these data, what would be the probability of 18-29?
4. Question: Consider the following table. Find the mean of this variable.
5. Question: Consider the following table. Find the variance of this variable.
6. Question: Consider the following table. Find the standard deviation of this variable.
7. Question: Ten frequent gamers are randomly selected. The random variable represents the number of frequent gamers who play video games on their smartphones. For this to be a binomial experiment, what assumption needs to be made?
8. Question: A survey found that 39% of all gamers play video games on their smartphones. Ten frequent gamers are randomly selected. The random variable represents the number of frequent games who play video games on their smartphones. What is the value of p?
9. Question: Thirty-five percent of US adults have little confidence in their cars. You randomly select ten US adults. Find the probability that the number of US adults who have little confidence in their cars is (1) exactly six and then find the probability that it is (2) more than 7.
10. Question: Eleven baseballs are randomly selected from the production line to see if their stitching is straight. Over time, the company has found that 98.3% of all their baseballs have straight stitching. If exactly nine of the eleven have straight stitching, should the company stop the production line?
11. Question: A supplier must create metal rods that are 18.1 inches long to fit into the next step of production. Can a binomial experiment be used to determine the probability that the rods are correct length or an incorrect length?
12. Question: In a box of 12 tape measures, there is one that does not work. Employees take a tape measure as needed. The tape measures are not returned, once taken. You are the 8^th employee to take a tape measure. Is this a binomial experiment?
13. Question: Eighty-two percent of employees make judgements about their co-workers based on the cleanliness of their desk. You randomly select 7 employees and ask them if they judge co-workers based on this criterion. The random variable is the number of employees who judge their co-workers by cleanliness. Which outcomes of this binomial distribution would be considered unusual?
14. Question: The probability of a potential employee passing a drug test is 91%. If you selected 15 potential employees and gave them a drug test, how many would you expect to pass the test?
15. Question: Off the production line, there is a 4.6% chance that a candle is defective. If the company selected 50 candles off the line, what is the standard deviation of the number of defective candles in the group?

MATH 221N Week 3 Homework (Version 7)

1. Question: Let x represent the length of cars in a parking lot. This would be considered what type of variable:
2. Question: Let x represent the inches of rain on crops in Akron, Ohio. This would be considered what type of variable:
3. Question: Consider the following table. If you created the probability distribution for these data, what would be the probability of 40-49?
4. Question: Consider the following table. Find the mean of this variable.
5. Question: Consider the following table. Find the variance of this variable.
6. Question: Consider the following table. Find the standard deviation of this variable.
7. Question: Ten fourth graders are randomly selected. The random variable represents the number of fourth graders who own a smartphone. For this to be a binomial experiment, what assumption needs to be made?
8. Question: A survey found that 39% of all gamers play video games on their smartphones. Ten frequent gamers are randomly selected. The random variable represents the number of frequent games who play video games on their smartphones. What is the value of p?
9. Question: Sixty-eight percent of US adults have little confidence in their cars. You randomly select eleven US adults. Find the probability that the number of US adults who have little confidence in their cars is (1) exactly eight and then find the probability that it is (2) more than 6.
10. Question: Eleven baseballs are randomly selected from the production line to see if their stitching is straight. Over time, the company has found that 98.3% of all their baseballs have straight stitching. If exactly nine of the eleven have straight stitching, should the company stop the production line?
11. Question: A supplier must create metal rods that are 2.1 inches width to fit into the next step of production. Can a binomial experiment be used to determine the probability that the rods are too wide, too narrow, or about right?
12. Question: In a box of 12 tape measures, there is one that does not work. Employees take a tape measure as needed. The tape measures are not returned, once taken. You are the 8^th employee to take a tape measure. Is this a binomial experiment?
13. Question: Fifty-three percent of employees make judgements about their co-workers based on the cleanliness of their desk. You randomly select 8 employees and ask them if they judge co-workers based on this criterion. The random variable is the number of employees who judge their co-workers by cleanliness. Which outcomes of this binomial distribution would be considered unusual?
14. Question: The probability of a potential employee passing a drug test is 86%. If you selected 15 potential employees and gave them a drug test, how many would you expect to pass the test?
15. Question: Off the production line, there is a 3.7% chance that a candle is defective. If the company selected 45 candles off the line, what is the standard deviation of the number of defective candles in the group?

MATH 221 Week 3 Homework (Version 8)

1. Question: Let x represent the length of cars in a parking lot. This would be considered what type of variable:
2. Question: Let x represent sheets of paper in a package. This would be considered what type of variable:
3. Question: Consider the following table. If you created the probability distribution for these data, what would be the probability of 18-29?
4. Question: Consider the following table. Find the mean of this variable.
5. Question: Consider the following table. Find the variance of this variable.
6. Question: Consider the following table. Find the standard deviation of this variable.
7. Question: Ten frequent gamers are randomly selected. The random variable represents the number of frequent gamers who play video games on their smartphones. For this to be a binomial experiment, what assumption needs to be made?
8. Question: A survey found that 39% of all gamers play video games on their smartphones. Ten frequent gamers are randomly selected. The random variable represents the number of frequent games who play video games on their smartphones. What is the value of p?
9. Question: Sixty-eight percent of US adults have little confidence in their cars. You randomly select eleven US adults. Find the probability that the number of US adults who have little confidence in their cars is (1) exactly eight and then find the probability that it is (2) more than 6.
10. Question: Eleven baseballs are randomly selected from the production line to see if their stitching is straight. Over time, the company has found that 98.3% of all their baseballs have straight stitching. If exactly nine of the eleven have straight stitching, should the company stop the production line?
11. Question: A supplier must create metal rods that are 18.1 inches long to fit into the next step of production. Can a binomial experiment be used to determine the probability that the rods are correct length or an incorrect length?
12. Question: In a box of 12 tape measures, there is one that does not work. Employees take a tape measure as needed. The tape measures are not returned, once taken. You are the 8^th employee to take a tape measure. Is this a binomial experiment?
13. Question: Eighty-two percent of employees make judgements about their co-workers based on the cleanliness of their desk. You randomly select 7 employees and ask them if they judge co-workers based on this criterion. The random variable is the number of employees who judge their co-workers by cleanliness. Which outcomes of this binomial distribution would be considered unusual?
14. Question: The probability of a potential employee passing a drug test is 91%. If you selected 15 potential employees and gave them a drug test, how many would you expect to pass the test?
15. Question: Off the production line, there is a 2.2% chance that a candle is defective. If the company selected 40 candles off the line, what is the standard deviation of the number of defective candles in the group?