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Tutors Answer Your Questions about Probability-and-statistics (FREE)
Question 168677: Two companies are bidding for two contracts,company A has a 75% chance and company B has a 25% chance. What is the probability that Company A will win both and of company A getting the first contract and Company B getting the second: Two companies are bidding for two contracts,company A has a 75% chance and company B has a 25% chance. What is the probability that Company A will win both and of company A getting the first contract and Company B getting the second
Click here to see answer by gonzo(436)  |
Question 168666: Each month in UP. a year level generates an average of 28 lbs of paper trash for recycling. Assume the standard deviation is 21lbs. Assume the variable is approximately normally distributed. If a year level is selected at random find the percentage of generating:
A. 0 between 27 and 31 lbs per month.
B. More than 30.2 lbs per month.: Each month in UP. a year level generates an average of 28 lbs of paper trash for recycling. Assume the standard deviation is 21lbs. Assume the variable is approximately normally distributed. If a year level is selected at random find the percentage of generating:
A. 0 between 27 and 31 lbs per month.
B. More than 30.2 lbs per month.
Click here to see answer by stanbon(18754) |
Question 168474: Find the area under the curve between 12 and 15 when
A. Mean = 10, s=5
B. Mean = 20, s=10: Find the area under the curve between 12 and 15 when
A. Mean = 10, s=5
B. Mean = 20, s=10
Click here to see answer by stanbon(18754) |
Question 168294: statistics:the frequency distribution of 50 labour of a factory according to their daily wages is given below. find the mean.: statistics:the frequency distribution of 50 labour of a factory according to their daily wages is given below. find the mean.
Click here to see answer by stanbon(18754) |
Question 168233: Hi, my question is :
The probability to pass in 60 examinations is 0.68, and the probability to fail is 0.32. Given, for the 5th examination, there has been 4pass and 1fail. What is the probability to get a pass in the 6th examination? and what is the probability to get a fail in the 6th examination?
: Hi, my question is :
The probability to pass in 60 examinations is 0.68, and the probability to fail is 0.32. Given, for the 5th examination, there has been 4pass and 1fail. What is the probability to get a pass in the 6th examination? and what is the probability to get a fail in the 6th examination?
Click here to see answer by edjones(2391) |
Question 167759: numbers is a game where you bet $1 on any three digit number from 000 to 999. if your number comes up, you get $500. Find the expected winnings : numbers is a game where you bet $1 on any three digit number from 000 to 999. if your number comes up, you get $500. Find the expected winnings
Click here to see answer by stanbon(18754) |
Question 168033: A sample of 100 one-dollar bills from the Subway cash register revealed that 16 had something written on them besides the normal printing (e.g., “Bob ﾀ Mary”). (a) At α = .05, is this sample evidence consistent with the hypothesis that 10 percent or fewer of all dollar bills have anything written on them besides the normal printing? (a) At α = .05, is this sample evidence consistent with the hypothesis that 10 percent or fewer of all dollar bills have anything written on them besides the normal printing?: A sample of 100 one-dollar bills from the Subway cash register revealed that 16 had something written on them besides the normal printing (e.g., “Bob ﾀ Mary”). (a) At α = .05, is this sample evidence consistent with the hypothesis that 10 percent or fewer of all dollar bills have anything written on them besides the normal printing? (a) At α = .05, is this sample evidence consistent with the hypothesis that 10 percent or fewer of all dollar bills have anything written on them besides the normal printing?
Click here to see answer by stanbon(18754) |
Question 167241: suppose the prices of all three year old porsche 911 sports cars have a normal distribution with a mean of 48,125 and a standard deviation of 1600. what is the probability that a randomly selected three year old porsche 911 will sell for a price between 46,000 and 49,000?: suppose the prices of all three year old porsche 911 sports cars have a normal distribution with a mean of 48,125 and a standard deviation of 1600. what is the probability that a randomly selected three year old porsche 911 will sell for a price between 46,000 and 49,000?
Click here to see answer by stanbon(18754) |
Question 167423: Nine customers at a supermarket are asked independently if they use brand X laundry soap. In general, 27% of the population use this brand. What is the probability that among the nine, more than two people use brand X? (Round your answer to 4 decimal places.): Nine customers at a supermarket are asked independently if they use brand X laundry soap. In general, 27% of the population use this brand. What is the probability that among the nine, more than two people use brand X? (Round your answer to 4 decimal places.)
Click here to see answer by stanbon(18754) |
Question 167424: Twenty-six percent of all cars crossing a toll bridge have a commuter sticker. What is the probability that among 11 randomly selected cars waiting to cross the bridge at least 3 have commuter stickers? (Round your answer to 4 decimal places.): Twenty-six percent of all cars crossing a toll bridge have a commuter sticker. What is the probability that among 11 randomly selected cars waiting to cross the bridge at least 3 have commuter stickers? (Round your answer to 4 decimal places.)
Click here to see answer by stanbon(18754) |
Question 167425: A single die is tossed thirteen times. Find the probability that exactly eleven of the tosses show a "three.": A single die is tossed thirteen times. Find the probability that exactly eleven of the tosses show a "three."
Click here to see answer by stanbon(18754) |
Question 167113This question is from textbook algebra 2
: how many ways can six different books be arranged on a shelf if one of the books is a dictionary and it must be listed first or last?This question is from textbook algebra 2
: how many ways can six different books be arranged on a shelf if one of the books is a dictionary and it must be listed first or last?
Click here to see answer by stanbon(18754) |
Question 167343: if there is four girls and eight boys running for president or vice president of the student council what is the probability that two boys are elected and what is the probabilty that two girls are elected: if there is four girls and eight boys running for president or vice president of the student council what is the probability that two boys are elected and what is the probabilty that two girls are elected
Click here to see answer by stanbon(18754) |
Question 167214: I have 27 balls. 14 are red and 13 blue. I deceded to group the balls into a group of 3s ?
the balls will be choosen randomly.
What is the probablity that the group will have 2 red and 1 blue.
2)-the probability that the group will have all reds or all blue: I have 27 balls. 14 are red and 13 blue. I deceded to group the balls into a group of 3s ?
the balls will be choosen randomly.
What is the probablity that the group will have 2 red and 1 blue.
2)-the probability that the group will have all reds or all blue
Click here to see answer by Edwin McCravy(2038) |
Question 167214: I have 27 balls. 14 are red and 13 blue. I deceded to group the balls into a group of 3s ?
the balls will be choosen randomly.
What is the probablity that the group will have 2 red and 1 blue.
2)-the probability that the group will have all reds or all blue: I have 27 balls. 14 are red and 13 blue. I deceded to group the balls into a group of 3s ?
the balls will be choosen randomly.
What is the probablity that the group will have 2 red and 1 blue.
2)-the probability that the group will have all reds or all blue
Click here to see answer by scott8148(2719) |
Question 167211: I have 27 balls. 14 are red and 13 blue. I deceded to group the balls into a group of 3s ?
the balls will be choosen randomly.
What is the probablity that the group will have 2 red and 1 blue.
2)-the probability that the group will have all reds or all blue: I have 27 balls. 14 are red and 13 blue. I deceded to group the balls into a group of 3s ?
the balls will be choosen randomly.
What is the probablity that the group will have 2 red and 1 blue.
2)-the probability that the group will have all reds or all blue
Click here to see answer by scott8148(2719) |
Question 167212: I have 27 balls. 14 are red and 13 blue. I deceded to group the balls into a group of 3s ?
the balls will be choosen randomly.
What is the probablity that the group will have 2 red and 1 blue.
2)-the probability that the group will have all reds or all blue: I have 27 balls. 14 are red and 13 blue. I deceded to group the balls into a group of 3s ?
the balls will be choosen randomly.
What is the probablity that the group will have 2 red and 1 blue.
2)-the probability that the group will have all reds or all blue
Click here to see answer by scott8148(2719) |
Question 166578: A single die is tossed thirteen times. Find the probability that exactly eleven of the tosses show a "three.": A single die is tossed thirteen times. Find the probability that exactly eleven of the tosses show a "three."
Click here to see answer by edjones(2391) |
Question 166579: A jury has 12 jurors. A vote of at least 10 of 12 for "guilty" is necessary for a defendant to be convicted of a crime. Assume that each juror acts independently of the others and that the probability that any one juror makes the correct decision on a defendant is 0.88. If the defendant is guilty, what is the probability that the jury makes the correct decision? (Round your answer to 4 decimal places.): A jury has 12 jurors. A vote of at least 10 of 12 for "guilty" is necessary for a defendant to be convicted of a crime. Assume that each juror acts independently of the others and that the probability that any one juror makes the correct decision on a defendant is 0.88. If the defendant is guilty, what is the probability that the jury makes the correct decision? (Round your answer to 4 decimal places.)
Click here to see answer by edjones(2391) |
Question 166313: Identify the probability statement as empirical or not.
The probability of an adult male's height being at least 6 feet is 0.25: Identify the probability statement as empirical or not.
The probability of an adult male's height being at least 6 feet is 0.25
Click here to see answer by Fombitz(1740) |
Question 166309: Find the expected value of the random variable in the experiment.
Three cards are drawn from a deck without replacement. THe number of aces is counted.
The choices are a) .2308 b) 1 c).2174 d)1.0134: Find the expected value of the random variable in the experiment.
Three cards are drawn from a deck without replacement. THe number of aces is counted.
The choices are a) .2308 b) 1 c).2174 d)1.0134
Click here to see answer by stanbon(18754) |
Question 166316: a die is rolled twice. Write the indicated event in set notation. The sum of the rolls is 13.: a die is rolled twice. Write the indicated event in set notation. The sum of the rolls is 13.
Click here to see answer by stanbon(18754) |
Question 166311: Find the percent of the total area under the standard normal curve between the given z-scores. Z=-0.55 and Z=0.55
the choices are
a)-0.4176
b)-0.9000
c)0.4176
d)0.9000: Find the percent of the total area under the standard normal curve between the given z-scores. Z=-0.55 and Z=0.55
the choices are
a)-0.4176
b)-0.9000
c)0.4176
d)0.9000
Click here to see answer by stanbon(18754) |
Question 166312: At one high school, students can run the 100-yard dash in an average of 15.2 seconds with a standard deviation of .9 seconds. The times are very closely approximated by a normal curve. Find the percent of times that are: greater than 16.1 seconds.: At one high school, students can run the 100-yard dash in an average of 15.2 seconds with a standard deviation of .9 seconds. The times are very closely approximated by a normal curve. Find the percent of times that are: greater than 16.1 seconds.
Click here to see answer by stanbon(18754) |
Question 166315: the odds in favor of Trudy beating her friend in a round of golf are 1:9. Find the probability that Trudy will lose.: the odds in favor of Trudy beating her friend in a round of golf are 1:9. Find the probability that Trudy will lose.
Click here to see answer by stanbon(18754) |
Question 166307: Assume that two marbles are drawn without replacement from a box with 1 blue, 3 white, 2 green, and 2 red marbles. Find the probability that the second marble is white, given that the first marble is blue.: Assume that two marbles are drawn without replacement from a box with 1 blue, 3 white, 2 green, and 2 red marbles. Find the probability that the second marble is white, given that the first marble is blue.
Click here to see answer by Mathtut(334) |
Question 165970: can anyone please help me with this problem:
Use the given table to find the probability of the indicated event. Round your answer to the nearest thousandth.
College students were given three choices of pizza toppings and asked to choose one favorite. The following table shows the results.
toppings; freshman; sophomore; junior; senior
cheese; 10; 12; 24; 21
meat; 22; 21; 12; 10
veggie 12l; 10 22; 21
A randomly selected student prefers a meat topping.
a. .324
b. .0.61
c. .330
d. .185: can anyone please help me with this problem:
Use the given table to find the probability of the indicated event. Round your answer to the nearest thousandth.
College students were given three choices of pizza toppings and asked to choose one favorite. The following table shows the results.
toppings; freshman; sophomore; junior; senior
cheese; 10; 12; 24; 21
meat; 22; 21; 12; 10
veggie 12l; 10 22; 21
A randomly selected student prefers a meat topping.
a. .324
b. .0.61
c. .330
d. .185
Click here to see answer by jim_thompson5910(9171) |
Question 165737: A person rolls two dies and wins if the sume is 7. What are the odds in favor of winning? What are the odds in against winning?: A person rolls two dies and wins if the sume is 7. What are the odds in favor of winning? What are the odds in against winning?
Click here to see answer by checkley77(3397) |
Question 165671: calculate the probabilty of randomly guessing the given number of correct answers on a 30-question multiple-choice exam that has choices A, B,C,and D for each question.
#19) 2: calculate the probabilty of randomly guessing the given number of correct answers on a 30-question multiple-choice exam that has choices A, B,C,and D for each question.
#19) 2
Click here to see answer by edjones(2391) |
Question 165502: Please help with my homework question on Interval Estimations. The book is Statistics for Business and Economics. A sample survey of 54 discount brokers showed that the mean price charged for a trade of 100 shares at $50 per share was $33.77. The survey is conducted annually. With the historical data available, assume a known population standard deviation of $15.
a. Using the sample data, what is the margin of error associated with a 95% confidence interval?
b. Develop a 95% confidence interval for the mean price charged by discount brokers for a trade of 100 shares at $50 per share.: Please help with my homework question on Interval Estimations. The book is Statistics for Business and Economics. A sample survey of 54 discount brokers showed that the mean price charged for a trade of 100 shares at $50 per share was $33.77. The survey is conducted annually. With the historical data available, assume a known population standard deviation of $15.
a. Using the sample data, what is the margin of error associated with a 95% confidence interval?
b. Develop a 95% confidence interval for the mean price charged by discount brokers for a trade of 100 shares at $50 per share.
Click here to see answer by gonzo(436) |
Question 165388: Suppose 500 coins are tossed. Using the normal curve approximation to the binomial distribution, find the probability of getting 251 heads or less.: Suppose 500 coins are tossed. Using the normal curve approximation to the binomial distribution, find the probability of getting 251 heads or less.
Click here to see answer by gonzo(436) |
Question 165391: find the percent of the total area under the standard curve between the given z-scores. z = 2.18 and z = 3.45: find the percent of the total area under the standard curve between the given z-scores. z = 2.18 and z = 3.45
Click here to see answer by Fombitz(1740) |
Question 165391: find the percent of the total area under the standard curve between the given z-scores. z = 2.18 and z = 3.45: find the percent of the total area under the standard curve between the given z-scores. z = 2.18 and z = 3.45
Click here to see answer by gonzo(436) |
Question 165381: What is the probability that 15 rolls of a fair die will show three threes?: What is the probability that 15 rolls of a fair die will show three threes?
Click here to see answer by gonzo(436) |
Question 165415: A die is rolled 20 times and the number of twos that comes up is tallied. Find the probability of getting the given result. Exactly five twos.: A die is rolled 20 times and the number of twos that comes up is tallied. Find the probability of getting the given result. Exactly five twos.
Click here to see answer by stanbon(18754) |
Question 165389: Suppose 500 coins are tossed. Using the normal curve approximation to the binomial distribution, find the probability of getting 251 heads or less.: Suppose 500 coins are tossed. Using the normal curve approximation to the binomial distribution, find the probability of getting 251 heads or less.
Click here to see answer by Edwin McCravy(2038) |
Question 165393: Find the standard deviation. 44, 90, 73, 65, 76, 22, 50, 45, 37: Find the standard deviation. 44, 90, 73, 65, 76, 22, 50, 45, 37
Click here to see answer by Edwin McCravy(2038) |
Question 165394: Find the standard deviation. 44, 90, 73, 65, 76, 22, 50, 45, 37: Find the standard deviation. 44, 90, 73, 65, 76, 22, 50, 45, 37
Click here to see answer by Edwin McCravy(2038) |
Question 164405This question is from textbook Elementary Statistics
: If 10% of the people who are given a certain drug experience dizziness, find the probabilities for a sample of 15 people who take the drug.
A. At least two people become dizzy
b. Exactly three people become dizzy
c. At most four people become dizzy.This question is from textbook Elementary Statistics
: If 10% of the people who are given a certain drug experience dizziness, find the probabilities for a sample of 15 people who take the drug.
A. At least two people become dizzy
b. Exactly three people become dizzy
c. At most four people become dizzy.
Click here to see answer by themathprof(21) |
Question 164816: A company is taking a survey to find out
whether people like its product. Their last survey indicated
that 70% of the population like the product. Based on that,
of a sample of 58 people, find the probabilities of the following.
a. All 58 like the product.
b. From 28 to 30 (inclusive) like the product.: A company is taking a survey to find out
whether people like its product. Their last survey indicated
that 70% of the population like the product. Based on that,
of a sample of 58 people, find the probabilities of the following.
a. All 58 like the product.
b. From 28 to 30 (inclusive) like the product.
Click here to see answer by themathprof(21) |
Question 164964: The results shown below are mean productivity measurements (average number of assemblies completed per hour) for a random sample of workers at each of three plants. Research question: Are the mean hourly productivity levels the same for workers in these three plants? Productivity
Hourly Productivity of Assemblers in Plants
Plant Finished Units Produced Per Hour
A (9 workers) 3.6 5.1 2.8 4.6 4.7 4.1 3.4 2.9 4.5
B (6 workers) 2.7 3.1 5.0 1.9 2.2 3.2
C (10 workers) 6.8 2.5 5.4 6.7 4.6 3.9 5.4 4.9 7.1 8.4
: The results shown below are mean productivity measurements (average number of assemblies completed per hour) for a random sample of workers at each of three plants. Research question: Are the mean hourly productivity levels the same for workers in these three plants? Productivity
Hourly Productivity of Assemblers in Plants
Plant Finished Units Produced Per Hour
A (9 workers) 3.6 5.1 2.8 4.6 4.7 4.1 3.4 2.9 4.5
B (6 workers) 2.7 3.1 5.0 1.9 2.2 3.2
C (10 workers) 6.8 2.5 5.4 6.7 4.6 3.9 5.4 4.9 7.1 8.4
Click here to see answer by themathprof(21) |
Question 165234: Please help me with:
Answer the following questions for the function f(x)=x^8-3x^5+22
(a) What is the maximum number of zeros that the function can have?
(b) What is the maximum number of x intercepts that the function can have?
(c) What is the maximum number of turning points that the function can have?
: Please help me with:
Answer the following questions for the function f(x)=x^8-3x^5+22
(a) What is the maximum number of zeros that the function can have?
(b) What is the maximum number of x intercepts that the function can have?
(c) What is the maximum number of turning points that the function can have?
Click here to see answer by edjones(2391) |
Question 164974: Can you please explain.
The probability is 1 in 4,000,000 that a single auto trip in the United States will result in a fatality. Over a lifetime, an average U.S. driver takes 50,000 trips. (a) What is the probability of a fatal accident over a lifetime? Explain your reasoning carefully. Hint: Assume independent events. Why might the assumption of independence be violated? (b) Why might a driver be tempted not to use a seat belt “just on this trip”?: Can you please explain.
The probability is 1 in 4,000,000 that a single auto trip in the United States will result in a fatality. Over a lifetime, an average U.S. driver takes 50,000 trips. (a) What is the probability of a fatal accident over a lifetime? Explain your reasoning carefully. Hint: Assume independent events. Why might the assumption of independence be violated? (b) Why might a driver be tempted not to use a seat belt “just on this trip”?
Click here to see answer by checkley77(3397) |
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