random

4,731 results, page 13
  1. math

    make a tree diagram for: two methods A and B are available for teaching a certain industrial skill. the failure rate is 20% for A and 10% for B. however, B is more expensive and is therefore only used 30% of the time (A is used the other 70%). A worker is

    asked by Anonymous on November 10, 2010
  2. Statistics

    A population of values has a normal distribution with μ=76.6 and σ=43.9 You intend to draw a random sample of size n=142. Find P75, which is the score separating the bottom 75% scores from the top 25% scores.

    asked by Zameer on January 2, 2017
  3. math

    Hi! I'm Maddie. I need some help on my homework. Here are three problems I need help with: A bowl contains only red marbles, blue marbles and green marbles. The probability of selecting a red marble from the bowl is 3/13. The probability of selecting a

    asked by Maddie on August 21, 2013
  4. Maths

    Two concentric circles are such that one circle has half the radius of the other. If a point is chosen at random inside the larger circle, the probability that it also lands outside the smaller circle is?

    asked by Matthew on November 22, 2017
  5. statistics

    Construct a 95% confidence interval for the population mean. 5. Airfare A random sample of airfare prices (in dollars) for a one-way ticket airfare between two cities MN. Key: 21|1=211 21 | 1 2 22 | 1 1 1 2 3 5 7 8 23 | 2 3 4 7 7 8 9 9 24 | 2 3 4 8 8 25 |

    asked by anna on February 24, 2014
  6. statistics

    Construct a 95% confidence interval for the population mean. 5. Airfare A random sample of airfare prices (in dollars) for a one-way ticket airfare between two cities MN. Key: 21|1=211 21 | 1 2 22 | 1 1 1 2 3 5 7 8 23 | 2 3 4 7 7 8 9 9 24 | 2 3 4 8 8 25 |

    asked by anna on February 24, 2014
  7. Math

    *Sigh* Can someone explain to me how I would work through this problem? An honest coin tossed n=3600 times. Let the random variable Y denote the number of tails tossed. (a) find the mean and the standard deviation of the distribution of the random variable

    asked by SherylA on October 5, 2006
  8. Math

    oel scores in 80% of his games. His team is starting the playoffs, and if they make it to the state championship, they will have played 5 games. Joel wants to determine the probability that he scores in 4 of the 5 games. Which simulation design has an

    asked by Allison Carson on February 9, 2016
  9. Math

    Two cards are drawn at random from a standard deck of 52 cards. What is the probability that both cards are queens?

    asked by Nora on March 10, 2010
  10. Math

    If a grade was drawn at random from the data shown below, what is the probability that the grade is not a B? Grade Frequency A 2 B 8 C 11 D 2 F 1 I think it is 1 out of 5 or 4 but I am not sure? Please help :) Thank you much!

    asked by Shannon on December 5, 2010
  11. Math 120

    A box contains 10 ​transistors,4 of which are defective. If 4 are selected at​ random, find the probability that a. All are defective. b. None are defective.

    asked by Beth on March 23, 2017
  12. 10

    A letter is picked random from the word COMPUTER. What is the probability that it is neither in the word met nor in the word up

    asked by Anonymous on June 5, 2016
  13. Stats

    a) IHI insurance is interested in determining whether younger drivers (below the age of 25) are more prone to motor accidents than older drivers (25 or older). A random sample of 70 IHI policyholders below the age of 25 were selected and whether they had

    asked by Scott on October 9, 2010
  14. statistics

    What is wrong with the statement: It is believed that the proportion of Middle School teachers who leave the profession within 5 years is different from the proportion of High School teachers who leave the profession within 5 years. Test with a level of

    asked by Terri on April 14, 2014
  15. statistics

    Select five random numbers between 70 and 100. Calculate the mean, median, mode, and midrange of these numbers. Based on your calculations, which measure of central tendency best represents these numbers?

    asked by Rose on December 13, 2007
  16. Math

    Tickst number 1-15are placed in a hat ,2 Tickets Are drawn at random without replacement find the probability that both Numbers Are Greater then 9 B.) the First Number is Prime and the Second number is Composite?

    asked by Roman on May 17, 2016
  17. statistics

    Select five random numbers between 70 and 100. Calculate the mean, median, mode, and midrange of these numbers. Based on your calculations, which measure of central tendency best represents these numbers?

    asked by Rose on December 14, 2007
  18. statistics

    a simple random sample will be obtained from a normally distributed population. find the minimum sample size needed to be 95% confident that the sample standard deviation (s) is within 10% of sigma. please help!

    asked by lucy on April 16, 2011
  19. statistics

    Select five random numbers between 70 and 100. Calculate the mean, median, mode, and midrange of these numbers. Based on your calculations, which measure of central tendency best represents these numbers?

    asked by Rose on December 14, 2007
  20. Mathematics

    6 black counters and 4 white counters in bag A. 7 black counters and 3 white counters in bag B. 5 black counters and 5 white counters in bag C. Tarek takes at random a counter from bag A and puts the counter in bag B. He then takes at random a counter from

    asked by Alexander on March 30, 2017
  21. statistic

    Let x be a random variable that represents the length of time it takes a student to complete a take-home exam in Dr. Larson’s psychology class. After interviewing many students, it was found that x has an approximately normal distribution with mean =5.2

    asked by Anonymous on November 6, 2013
  22. Statistics

    A box contains twelve candies, five reds, four greens, and three blues. You select one piece at random, then replace it, then you select another. If P(BG) is the probability of selecting a blue first and a green second, find the following probabilities. a.

    asked by Keonn'a on October 14, 2018
  23. Geometry

    Two points are chosen uniformly at random on the unit circle and joined to make a chord C1. This process is repeated 17 more times to get chords C2,C3,…,C18. What is the expected number of pairs of chords that intersect?

    asked by Sambaran G. on May 6, 2013
  24. Business Research

    10. Using a table of random numbers, select six names from the following list of 10: Michael Susan Sara Kent Selma Harriet Annette David Sharon Ed How many of the six would you expect to be males, and how many would you expect to be females? Why?

    asked by Lindsey on January 25, 2012
  25. Math

    Identify the sampling method. You want to determine the number of text messages students at your school send in a month. You go to the cafeteria and randomly ask students as they come out of the lunch line. A. Random B. Systematic C. Stratified D. None of

    asked by Lana on January 14, 2016
  26. science

    List the five conditions that can disturb genetic equilibrium in a population I think Infinite population size, no mutation, no selection against a certain homozygous gene, random mating, no immigration/emigration Mutations. can someone let me know if this

    asked by corie on February 8, 2013
  27. Math Help

    Two points are chosen uniformly at random on the unit circle and joined to make a chord C1. This process is repeated 17 more times to get chords C2,C3,…,C18. What is the expected number of pairs of chords that intersect?

    asked by Mathslover Please help on May 8, 2013
  28. Math

    You are surveying students to find out their opinion of the quality of food served in the school cafeteria. You decide to poll only those students who buy hot lunch on a particular day. Is your sample random? Explain I think it would be but I'm not sure.

    asked by Gwen on May 6, 2014
  29. statistics

    Consider the following types of data that were obtained from a random sample of 49 credit card accounts. Identify all the averages that can be used to summarize the data.(Select all that apply) 1.Outstanding balance on each account: mode,median,mean?

    asked by Trevor on September 16, 2012
  30. Math

    Two points are chosen uniformly at random on the unit circle and joined to make a chord C1. This process is repeated 17 more times to get chords C2,C3,…,C18. What is the expected number of pairs of chords that intersect?

    asked by Mathslover Please help on May 6, 2013
  31. Math

    A set of dominoes has 28 dominos. There are 7 dominos called doubles with the same number of dots on each end. If Sara and Jake each take a rein picking domino at random and replacing it. What is the probability that they will both pick a double?

    asked by Please help on September 15, 2011
  32. Stats

    The heights of men in the USA are normally distributed with a mean of 68 inches and a standard of 4 inches. What is the probability that the mean height of a random sample of 35 men is greater than 69) inches? (Round your answer(s) to 3 decimal places.)

    asked by Morgan on June 24, 2011
  33. Probability

    Could someone please check this and let me know if I'm doing it correctly? Sammy and Sally each carry a bag containing banana, chocolate bar, and a licorice stick. Simutaneously, they take out a single good item and consume it. The possible food items that

    asked by Mary on October 28, 2006
  34. statistics

    a final exam in statistics has a mean of 73 with a standard deviation of 7.73. Assume that a random sample of 24 students is selected and the mean test score of the sample is computed. What percentage of sample means are less than 70?

    asked by erica on May 11, 2012
  35. statistics

    The heights of 10000 individuals are approximately normally distributed with a mean of 70 inches and a standard deviation of 3 inches. Find the probability that a person picked at random from this group will be between 65 and 74 inches tall.

    asked by sohail on October 27, 2010
  36. statistics

    7) A final exam in Statistics has a mean of 73 with a standard deviation of 7.73. Assume that a random sample of 24 students is selected and the mean test score of the sample is computed. What percentage of sample means are less than 70?

    asked by Anonymous on September 1, 2013
  37. staistics

    7) A final exam in Statistics has a mean of 73 with a standard deviation of 7.73. Assume that a random sample of 24 students is selected and the mean test score of the sample is computed. What percentage of sample means are less than 70?

    asked by Eli on November 19, 2016
  38. statistics

    The heights of 10000 individuals are approximately normally distributed with a mean of 70 inches and a standard deviation of 3 inches. Find the probability that a person picked at random from this group will be between 65 and 74 inches tall.

    asked by sohail on October 27, 2010
  39. Statistics/Probability

    The standard deviation of the masses of articles in a large population is 4.55 kg. Random samples of size 100 are drawn from the population. Find the probability that a sample mean will differ from the population mean by less than 0.8 kg.

    asked by Koylar on July 17, 2014
  40. Math

    A box has 8 blue and 5 green jelly beans. A bag has 6 blue and 8 green jelly beans. A jelly bean is selected at random from the box and placed in the bag. Then a jelly bean is selected at random from the bag. If a green jelly bean is selected from the bag,

    asked by Kerry on October 25, 2012
  41. Statistics

    7. A random sample of n1 = 16 communities in western Kansas gave the following rates of hay fever per 1000 population for people under 25 years of age. 121 115 124 99 134 121 110 116 113 96 116 116 135 96 96 116 A random sample of n2 = 14 communities in

    asked by Tab on January 26, 2011
  42. statistics

    2. A researcher measures the heart rate in a population of runners and finds they have an average heart rate of µ = 50, σ = 5. You do not need to show a graph, only computation work. 2A. Based on the average heart rate cited above, what proportion would

    asked by chris on June 28, 2014
  43. Math

    Joel scores in 80% of his games. His team is starting the playoffs, and if they make it to the state championship, they will have played 5 games. Joel wants to determine the probability that he scores in 4 of the 5 games. Which simulation design has an

    asked by Asia on February 12, 2016
  44. Math

    Joel scores in 80% of his games. His team is starting the playoffs, and if they make it to the state championship, they will have played 5 games. Joel wants to determine the probability that he scores in 4 of the 5 games. Which simulation design has an

    asked by Anonymous on February 12, 2016
  45. Math (check answers)

    1)Identify the sampling method. You want to determine the number of text messages students at your school send in a month. You go to the cafeteria and randomly ask students as they come out of the lunch line. A)Random*** B)Systematic C)Stratified D)None of

    asked by Sasha on June 1, 2015
  46. statistics

    an archer shoots arrows at the bull's eye of a target and measures the distance from the center of the target to the arrow. identify the random variable of interest, determine whether it is discrete or continuous, and list its possible values

    asked by Anonymous on November 7, 2016
  47. statistics

    A convenience store owner believes that the median number of lottery tickets sold per day is 49. A random sample of 20 days yields the data below. Find the critical value to test the owner's claim. 32 48 59 64 31 55 70 27 33 38 47 54 54 44 44 49 49 59 54

    asked by Shelby Hacker on April 27, 2013
  48. MATH

    Need help on the question below. A cat has a litter of 5 kittens. Which simulation could be used to determine the probability that exactly 3 kittens will be female? a. tossing 5 coins b. spinning a spinner with 5 equal parts c. using a random integers 1 to

    asked by Brandi on December 13, 2013
  49. Math

    i have my final tomorrow and this question was on my review? im having trouble with probability so... "your cat walks over the computer keyboard while you're away and hits three random letters. what is the probability that the word RAT appears" So on my

    asked by Mandee on December 13, 2011
  50. math

    A politician claims that she will receive 59% of the vote in an upcoming election. The results of a properly designed random sample of 100 voters showed that 54 of those sampled will vote for her. Is it likely that her assertion is correct at the 0.05

    asked by Lauren on November 10, 2013
  51. Statistics

    A random sample of state gasoline taxes is shown for 12 states. Use the data to estimate the true population mean gasoline tax with 90% confidence. Does your interval contain the national average of 0.21? assume normal distribution.

    asked by Say on March 3, 2015
  52. statistics

    a survey from teeneage research unlimited found that 30% of teenage consumers receive their spending money from parttime jobs. If 5 teenagers are selected at random, find the probability that at least 3 of them have part time jobs

    asked by samuel on March 22, 2017
  53. statistics

    a survey from teeneage research unlimited found that 30% of teenage consumers receive their spending money from parttime jobs. If 5 teenagers are selected at random, find the probability that at least 3 of them have part time jobs

    asked by Khloe B on July 19, 2012
  54. statistics

    The Stop N’ Go convenience chain recently selected a random sample of 10 customers. The store monitored the number of times each customer made a purchase at the store over a two-month period. The following data were collected:

    asked by petrit on June 25, 2013
  55. Statistics

    The amount of fill(weight of contents)put into a glass jar of spaghetti sauce is normally distributed with mean=850g and standard deviation=8g.the probability that a random sample of 24 jars has a mean weight greater than 848g is?need help

    asked by Joel on March 24, 2011
  56. STATS

    12- The number of cars sold annually by used car salespeople is normally distributed with a standard deviation of 19.22. A random sample of salespeople was taken and the number of cars each sold is listed her. 79 43 58 66 101 63 79 33 58 71 60 101 74 55 88

    asked by Judy and group on April 1, 2010
  57. statistics

    A random sample of n = 9 scores is obtained from a population with ì = 50 and ó = 9. If the sample mean is M = 59, what is the z-score corresponding to the sample mean?

    asked by Anonymous on November 6, 2011
  58. statistics

    If X is a random variable which is normally distributed with a mean of 100, then P(X100) True or False?

    asked by Leslie on May 9, 2008
  59. Math

    A number is drawn at random from {1,2,3,4,5,6}. What is the probability that either a number larger than 3 or an even number will occur?

    asked by Mandeep on April 17, 2012
  60. John jay college

    A random sample of n = 9 scores is obtained from a population with μ = 50 and σ = 9. If the sample mean is M = 59, what is the z-score corresponding to the sample mean?

    asked by Samantha on July 22, 2012
  61. math

    1 number is selected at random from 0-9,find the probability that number is odd number

    asked by kapil on March 21, 2016
  62. math

    Three cards are selected at random without replacement from a well-shuffled deck of 52 playing cards. Find the probability of the given event. (Round your answer to four decimal places.) Three cards of the same suit are drawn

    asked by Anonymous on October 24, 2015
  63. STATS

    . The time to fly between New York City and Chicago is normally distributed with a mean of 180 minutes and a standard deviation of 17 minutes. What is the z-score that corresponds to a random variable X outcome of 190 minutes?

    asked by Susan on February 8, 2015
  64. probability

    Tad draws three cards at random, without replacement, from a deck of ten cards numbered 1 through 10. What is the probability that no two of the cards drawn have numbers that differ by 1? Express your answer as a common fraction.

    asked by nikhil on February 20, 2017
  65. math probability

    Three cards are drawn at random without replacement from a standard fifty-two card deck of playing cards. What is the probability that among the three cards there is a pair or three of a kind? please provide complete solution with explanations:)

    asked by K on December 19, 2017
  66. statistics

    A Packaging Company sells soda and claims each can contains 12 oz. A random sample of 15 sodas yielded a sample mean of 11.2 oz. Given the sample standard deviation is 0.3 oz, estimate the margin of error for a 90% confidence interval.

    asked by robert on March 30, 2012
  67. probability

    josie is about to draw a card at random from a standard deck of 52 playing cards. determine the probability that she will draw a red card or a 7. a) 1/2 b) 1/13 c) 7/13 d) 15/26 thank you

    asked by nesa on November 4, 2017
  68. math

    in a primary school 70% of the boys and 55% of the girls can ride a bicycle. if a boy or a girl are chosen at random, what is the probability that both of them can ride a bicycle?

    asked by donald on May 13, 2013
  69. probability

    In a random sample of three integers between 1 and 365 inclusive, what is the probability, to three decimal place accuracy, that (a) the three numbers will all be di fferent; (b) the three numbers will not all be di fferent?

    asked by denim on September 4, 2013
  70. math

    Write a system of equations, three equations/three unknowns, that has (1, 2, 3) as the solution. for this can I just write any random coefficient and then put that as equal to 1,2 or 3? or if not what type of math would I use?

    asked by Samuel on November 6, 2017
  71. math

    There were 25 students who completed a survey. There were 11 boys and 14 girls. One survey was picked at random. To the nearest hundredth, what is the probability it was completed by a girl?

    asked by mara on April 9, 2012
  72. probability help!

    In a random sample of three integers between 1 and 365 inclusive, what is the probability, to three decimal place accuracy, that (a) the three numbers will all be di fferent; (b) the three numbers will not all be di fferent?

    asked by denim on September 5, 2013
  73. Algebra

    A sales force has 10 men and 10 women. A production unit of 7 people is set up at random. What is the probality that it will consist of 3 men and 4 women

    asked by Ruth on September 14, 2013
  74. math

    There were 29 students who completed a survey. There were 15 boys and 14 girls. One survey was picked at random. To the nearest hundredth, what is the probability it was completed by a girl? A.0.48 B.1.93 C.0.52 D.0.93

    asked by Daphne on November 18, 2010
  75. statistics (math)

    of college students 45% are women 8% have a GED. suppose a student is selected at random. Given that the selected employees is a woman. what is the probability that she has a GED

    asked by tanya on November 29, 2015
  76. statistics

    A group of six students all have different grades in statistics. The median mark in the group is 68. If two of the six students are selected at random, what is the probability that both have marks greater than 68?

    asked by Kendra on November 7, 2011
  77. statistics & probability

    according to a survey, 30% of 18-25 year olds have blue eyes. In a random sample of 8 people in this age group what is the probability that exactly 0 have blue eyes?

    asked by Madison on June 27, 2013
  78. math

    The decimal parts of the logarithms of two numbers taken at random are found to 6 decimal places. What is the probability that the second number can be subtracted from the first number without "borrowing" ?

    asked by urgently help needed please on May 2, 2016
  79. Math - Probability

    in a primary school 70% of the boys and 55% of the girls can ride a bicycle. if a boy or a girl are chosen at random, what is the probability that both of them can ride a bicycle?

    asked by donald on May 13, 2013
  80. Math

    Three different numbers are chosen at random from the set {1,2,3,4,5}. The numbers are arranged in increasing order. What is the probability that the resulting sequence is an arithmetic sequence?

    asked by Esmeralda on December 10, 2011
  81. physics

    3 miles to centimeters will someone help with that problem? and tell me how to show my work with all the multiplication and division. like 1 mile over 3 centimeters or whatever (random numbers) but will you show me how and what the answer is please

    asked by conversions on September 27, 2010
  82. Math

    Three different numbers are chosen at random from the set {1,2,3,4,5}. The numbers are arranged in increasing order. What is the probability that the resulting sequence is an arithmetic sequence?

    asked by Esmeralda on December 10, 2011
  83. statistics

    Come up with a unique way to choose random samples from a specific data set, also explain how you will assign each data item and how each item will be selected

    asked by Anita on November 9, 2010
  84. probability

    Suppose 1 person is picked at random from this group of dog owners. The probability that the person chosen is at least 50 years old and has at least 1 dog equals

    asked by shakara on April 6, 2011
  85. statistics

    A population has an average of 150,000 with a standard deviation of 27,000. A random sample of 81 items is chosen. What is the standard error?

    asked by anne on March 20, 2018
  86. Statistics homework distribution problem?

    i need help with how to solve this: consider a normal distribution with mean 30 and standard deviation 2. what is the probability a value selected at random from this distribution is greater than 30? the book gives me the answer but i need to know how to

    asked by jess on February 20, 2012
  87. probability

    A random sample of six integers in the interval [1,42] is to be drawn. The numbers are selected randomly, one after the other, and repeats are allowed. What is the probability the six numbers in the sample will all be different?

    asked by zach on September 4, 2013
  88. MATH

    NOT INDEPENDENT A box contains four white, three red, and two black marbles. Three marbles are chosen at random. a. What is the probability that all three are the same color? b. What is the probability that all three are different colors?

    asked by Sally on April 29, 2015
  89. statistics

    A small company has 9 female employees and 15 male employees. In how many ways can 8 employees be selected at random for drug testing if exactly 5 of the employees must be males?

    asked by Kasey on November 11, 2010
  90. math

    in a primary school 70% of the boys and 55% of the girls can ride a bicycle. if a boy and a girl are chosen at random what is the probability that both of them can ride a bicycle

    asked by unice on September 12, 2018
  91. 7th grade

    There were 31 students who completed a survey. There were 13 boys and 18 girls. One survey was picked at random. To the nearest hundredth, what is the probability it was completed by a girl?

    asked by Anonymous on December 16, 2010
  92. Math probability

    Suppose x is random variable with normal distribution (u,sigma^2) distribution and p(x

    asked by Star on June 20, 2018
  93. statistics

    1. 35% of North Americans do not think that college education is a contributory factor to economic success. A random sample of seven North Americans is selected

    asked by joanna on March 29, 2013
  94. math

    How would I figure out a random tile grid pattern for a room that is 25'1" in length and 12'7" in width with tile that is 16"x16" and 12"x12" with the majority being 12"x12"?

    asked by Faith on May 10, 2013
  95. Math Finite

    A box contains 15 pens of which 4 are defective. A random sample of 3 pens is taken without replacement and without regard to order. What is the probability of selecting at least one defective pen?

    asked by Amy on December 9, 2010
  96. Statistics

    A random sample of 47 students studied for an average of 7.1 hours last week. If the population standard deviation is 1.2 hours, what is the 90% confidence interval for the population mean?

    asked by Monica on April 18, 2014
  97. Maths

    The Random Variable X is normally distributed with mean 560 and standard deviation 20. Find P(X

    asked by Ed on February 26, 2018
  98. Statistics normal distribution

    54% of the children in a large city are boys. Using a suitable approximation, calculate the probability that a random sample of 1000 children contains more boys than girls ?

    asked by Kelvin on June 1, 2013
  99. Math

    There are 10 marbles in a bag. 5 blue, 3 red and 2 green. If you draw 1 marble at random, What are the odds in favor of drawing a red marble? Is the answer 3/10 or 3/7 ???

    asked by Anonymous on March 6, 2012
  100. Math(combinations) Help

    Let Pn be the set of all subsets of the set [n]={1,2,…,n}. If two elements of P5 are chosen at random, the expected number of elements (of [n]) that they have in common can be expressed as a/b where a and b are coprime positive integers. What is the

    asked by Mathslover on May 14, 2013

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