random

4,731 results, page 9
  1. PROBABILITY MATH

    Find the probability of correctly answering the first 4 questions on a multiple choice test if random guesses are made and each question has 5 possible answers. Explain to me the answer?

    asked by HM on November 9, 2011
  2. Algebra 2

    A random sample of 1000 people was chosen for a survey. 80% of them had health insurance. Find the 95% confidence interval. Round answers to 4 significant digits.

    asked by Abbie on December 2, 2015
  3. stat

    Assume that the table below represents the distribution of X. Note that X is a discrete random variable. The second column reports the number of observations for each value of X. Based on this information, what is the variance of X? X n 20 10 25 10 30 5 15

    asked by ashley on October 29, 2015
  4. MATH

    THE MEAN PRICE OF DIGITAL CAMERAS AT AN ELECTRONIS STOR IS $224, WITH A STANDARD DEVIATION OF $8. RANDOM SAMPLES OF SIZE 36 ARE DRAWN FROM THIS POPULATION AND THE MEAN OF EACH SAMPLE IS DETERMINED.

    asked by caintgetrite on November 5, 2010
  5. math

    I look at a random time of day at a digital clock (that shows times from 1:00 through 12:59). What is the probability that (ignoring the colon) I see a palindrome such as 8:08? Express your answer as a common fraction.

    asked by bob on November 15, 2012
  6. Statistics

    Let X be a binomial random variable with n = 100 and p = 0.2. Find approximations to these probabilities. (Round your answers to four decimal places.) P(17 < X < 28) I get the answer as 0.7059 but it is wrong. I can't seem to figure this out... Help please

    asked by Aria on February 28, 2014
  7. Data Management

    A random variable X is defined as the number of heads observed when a coin is tossed 4 times. Make a chart that shows the probability distribution for X. What is the expected value?

    asked by Alejandro on January 22, 2014
  8. probability and statistics

    Let Θ1, Θ2, W1, and W2 be independent standard normal random variables. We obtain two observations, X1=Θ1+W1,X2=Θ1+Θ2+W2. Find the MAP estimate θ^=(θ^1,θ^2) of (Θ1,Θ2) if we observe that X1=1, X2=3. (You will have to solve a system of two linear

    asked by AAA on April 2, 2017
  9. Math

    A bag contains only red and blue marbles. Yasmine takes one marble at random from the bag. The probability that she takes a red marble is 1 in 5. Yasmine returns the marble to the bag and adds five more red marbles to the bag. The probability that she

    asked by look on May 10, 2018
  10. Math Probability

    Philip rolls a standard number cube 24 times. Which is the best prediction for the number of times he will roll a number that is even and less than 4? Is it 4 times? Ryan flips a coin 8 times and gets tails all 8 times. What is the experimental probability

    asked by PleaseHelpCheckMyAnswers on March 22, 2016
  11. Probability

    A department store has determined that 25% of all their sales are credit sales. A random sample of 75 sales is selected and the proportion of credit sales in the sample is computed. a) What is the probability that the same proportion will be greater than

    asked by Janice on November 23, 2006
  12. probability

    2.The daily production from a car factory=3 different models-A,B,C which are in two different colours-R and S. Daily the factory produces 1600 model A cars,800 of model B and 600 of model C. Overall,40% of the cars are of colour R,60% of colour S.60% of of

    asked by Anonymous on May 18, 2008
  13. Business statistics

    1(a)Let Y have a binomial distribution with parameters n and p. We reject Ho: p=1/2 and accept H1: p>1/2 if Y>=c. Find n and c such that the probability of a Type I error is .10, and P(reject Ho/p=2/3)=.95. (b)What is the probability of a Type II error?

    asked by John on May 10, 2010
  14. Statistics

    A random sample of 384 people in Dalto City, a mid-sized city, revealed 112 individuals who work at more than one job. A second random sample of 432 workers from East Dettweiler, another mid-sized city, found 91 people who work at more than one job. To

    asked by John on November 5, 2012
  15. statistics

    A random sample of 384 people in Dalto City, a mid-sized city, revealed 112 individuals who work at more than one job. A second random sample of 432 workers from East Dettweiler, another mid-sized city, found 91 people who work at more than one job. To

    asked by Derp on October 26, 2012
  16. statistics

    A random sample of 384 people in Dalto City, a mid-sized city, revealed 112 individuals who work at more than one job. A second random sample of 432 workers from East Dettweiler, another mid-sized city, found 91 people who work at more than one job. To

    asked by John on November 4, 2012
  17. Math

    Expand Your Knowledge: Negative Binomial Distribution Suppose you have binomial trials for which the probability of success on each trial is p and the probability of failure is q= 1-p. Let k be a fixed whole number greater than or equal to 1. Let n be the

    asked by Billy on May 22, 2012
  18. programming

    Problem 6.9 Lottery Number Generator A lottery commission offers four different lottery games to play: Three-number, Four-number, Five-number and Five-number + 1 lotteries. Each game has independent numbers. Develop an application that randomly picks

    asked by Gabe on November 23, 2011
  19. math

    For the next eight problems, use the following scenario to find the probabilities: Jane has 4 quarters, 5 dimes, 6 nickels, and 2 pennies in her change purse. Two coins are drawn at random and the first coin IS NOT REPLACED.

    asked by corina on June 7, 2014
  20. Math

    There are 4 aces and 4 kings in a standard deck of 52 cards. You pick one card at random. What is the probability of selecting an ace or a king? Explain your reasoning. I am a bit confused on this one. Please help.

    asked by Patrick on March 28, 2018
  21. Statistics

    )The random sample shown below was selected from a normal distribution Complete parts (a) and (b). Construct a 99% confidence interval for the population mean u. Round to two decimal places as needed.

    asked by Carol Harper on March 23, 2014
  22. Math (Probablity

    Suppose a random variable X has mean μX = 6.3, and variance V(X) = 2.2. According to Chebyshev's Theorem, what is the upper bound for the probability that the distance between the value of X and μ will be at least 4.8? I don't even know where to start.

    asked by First Time Here :) on November 10, 2015
  23. Statistics

    Suppose x is a uniform random variable with values ranging from 40 to 60. Find the probability that a randomly selected observation exceeds 54. *** Im not sure how to do this. I thought I needed a standard deviation.

    asked by Kim on April 13, 2017
  24. statistics

    Let A and B be constants such that A < B. Let z be a standard normal random variable. For what values of A does P(A

    asked by Jane on May 10, 2008
  25. statistics

    A random sample of 12 joggers was asked to keep track and report the number of miles they ran last week. The responses are: 5.5 7.2 1.6 22.0 8.7 2.8 5.3 3.4 12.5 18.6 8.3 6.6 Compute the three statistics that measure central location

    asked by Anonymous on January 9, 2012
  26. statstics a level s1

    Three cards are selected at random without replacement, from a shuffled pack of 52 playing card. Using a tree diagram find the probability distribution of the number of honours (A,K,Q,J,10) obtained

    asked by Anonymous on December 25, 2015
  27. Math 1330

    In a survey of 1000 eligible voters selected at random, it was found that 200 had a college degree. Additionally, it was found that 90% of those who had a college degree voted in the last presidential election, whereas 47% of the people who did not have a

    asked by Ashleigh on April 9, 2012
  28. Probability

    A card is drawn at random from a deck of 52 cards. What is a probability that it is a King, given that it is a face card (J, Q, K)?

    asked by vika on October 12, 2010
  29. math

    A jar contains 21 brown, 4 violet, and 6 white marbles. A marble is drawn at random. P(not white) I think 6/31

    asked by Anonymous on March 13, 2014
  30. Math

    What is the probability that at least 2 people in a random group of 4 people have a birthday on the same day of the week? Answer:

    asked by Meghan on April 28, 2011
  31. math probability

    3 people are selected at random without replacement out of 12 girls and 3 boys. What is the probability of selecting all girls?

    asked by Anonymous on April 20, 2011
  32. Statistics

    Five cards are drawn at random without replacement from and ordinary deck of 52. What is the probability all 5 cards are from the same suit?

    asked by Kassie on April 7, 2010
  33. Probability

    A card is drawn at random from a deck of 52 cards. What is a probability that it is a King, given that it is a face card (J, Q, K)?

    asked by JHONY on October 19, 2010
  34. Probability

    A card is drawn at random from a deck of 52 cards. What is a probability that it is a King, given that it is a face card (J, Q, K)?

    asked by JHONY on October 19, 2010
  35. PROBABILITY

    A card is drawn at random from a deck of 52 cards. What is a probability that it is a King, given that it is a face card (J, Q, K)?

    asked by JHONY on October 19, 2010
  36. Prob and Stats

    If X is a random variable with distribution X~N(350,110) find (a)P(X

    asked by Kathryn on October 4, 2011
  37. math

    how do I graph this? y = -1/3 |x-2| like, I can do the simple ones (ex: y = -|x+3|), where you put random number for x and get the y value and graph it.. but the fraction confused me.. thanks in advance

    asked by nina on March 9, 2010
  38. Probability

    The random variables X and Y have a joint PDF of the form fX,Y(x,y)=c⋅exp{−12(4x2−8x+y2−6y+13)} E[X]= var(X)= E[Y]= var(Y)=

    asked by Ravi on March 18, 2015
  39. Statistics

    A two-digit number is written down at random.Find the probability that the number will be A)Smaller than 20 B)Even C)Multiple of 5

    asked by Rukhsar on January 4, 2017
  40. statistics

    Consider a normal distribution with mean 20 and standard deviation 3. What is the probability a value selected at random from this distribution is greater than 20?

    asked by erin on May 12, 2013
  41. probability

    A letter of english alphabets is chosen at random.What is the probability that it is a letter of the word MATHEMATICS.

    asked by Avay on December 5, 2016
  42. stats

    Suppose that 20% of Canadians smoke. In a random sample of 20 Canadians, find the probability that more than 1 smokes

    asked by alf on November 10, 2013
  43. math

    A student is chosen at random from a class of 10 boys and 20 girls. What are the odds that a girl is not chosen?

    asked by daryon on June 26, 2014
  44. statistics

    A random sample of n = 30 is drawn from a population that is normally distributed, and the sample variance is s©÷ = 41.5. Use ¥á = 0.05 in testing ¥Ç₀ : ¥ò©÷ = 29.0 versus ¥Ç©û : ¥ò©÷ ¡Á 29.0

    asked by Marianne on August 12, 2009
  45. mathematics

    a class contains 15 boys and 21 girls.a student is chosen at random.what is the probability that a boy is chosen?

    asked by musa ezekiel on July 11, 2016
  46. Statistics

    What is the probability that simple random sample of 50 staff members provides a sample mean leave of 6.5 to 9.5 weeks?

    asked by Melanie on August 1, 2017
  47. PROBABILITY

    A card is drawn at random from a deck of 52 cards. What is a probability that it is a King, given that it is a face card (J, Q, K)?

    asked by JHONY on October 19, 2010
  48. Pre Algebra

    Four numbers are drawn from random tiles numbereed 0 through 9. What are the odds of drawing numbers 1 through four in any order?

    asked by Katelyn on May 31, 2011
  49. Statistics

    a manufacturing machine has a 8% defect rate. if 5 items are chosen at random, what is the probability that at least one will have a defect

    asked by Mae on June 11, 2017
  50. Statistics

    A random sample is obtained from a normal population with a mean that equals 80 and a standard deviation that equals 8

    asked by Jim on March 12, 2011
  51. Elementary Math

    The temperature of a cup of coffee is a discrete or continuous random variable? Am I correct " Discrete"

    asked by J.J. on August 9, 2009
  52. Statistics and Probability

    Let Y be the discrete random variable with probability function p(y) = (1/2)^(y+1) y = 0, 1, 2,... Find the moment-generating function m(t) for Y.

    asked by Jen on March 17, 2018
  53. statics

    you select a name at random from a hat that contains 33 freshmen,34 sophomores, 30 juniors, and 28 seniors. what is the probability that the name is a seniors?

    asked by bernie on July 29, 2016
  54. college

    if u pick a card random from a well shuffled deck ,what is the probability you get a face card or a spade.

    asked by rency on October 28, 2009
  55. Math

    A number is chosen at random from among all 5-digit numbers containing only the digits 1,2,3,4, and/or 5. Find the probability that the digits are all different.

    asked by Julie on October 17, 2015
  56. math

    5 cards are drawn at random from a standard deck of playing cards. What is the probability that all are the same suit?

    asked by Derrick on May 14, 2012
  57. Maths

    There are m boys and 12 girls in a class what is the probability of selecting of random 1 a girl 2 a boy from class

    asked by Joy on January 29, 2017
  58. math

    A jar contains 21 brown, 4 violet, and 6 white marbles. A marble is drawn at random. what is the probability you will not draw a white marble? Answer 6/31 A jar contains 6 pink, 7 violet, 26 green, and 13 blue marbles. A marble is drawn at random. what is

    asked by Anonymous on March 13, 2014
  59. Probability/Statistics

    1)Two marbles are chosen at random from a bag containing 3 blue and 2 red marbles. The relative-frequency histogram shows the distribution of the number of red marbles chosen. Find P(0 red). (the gragh shows 3/10 for 0 red, 3/5 for 1 red, and 1/10 for 2

    asked by Jon on February 7, 2008
  60. statistics

    Describe a process you could use to get a simple random sample of size 20 from a class of size 40

    asked by kmccraney on April 30, 2012
  61. Probability Help

    Forty people are selected at random. What is the probability that none of the people in this group have the same birthday? ​

    asked by Bobbie on December 6, 2016
  62. statistics

    The profit for a new product is given by Z = 2X - 2Y - 7. We know that X and Y are independent random variables with Var(X) = 2 and Var(Y) = 2.7. What is the variance of Z?

    asked by Dani on October 24, 2011
  63. mathematics

    A box contains 40 oranges,12 of which are unripe.i pick one at random.what is the probability that it is (a)ripe, (b)unripe?

    asked by musa ezekiel on July 10, 2016
  64. Probabiltiy

    If n letters were put in n envelopes at random, what is the probability that eactlly n-1 of them were in the correct envelopes?

    asked by Jen on July 21, 2008
  65. statistics

    1. Draw a random sample of size 12 from a Poisson Population with mean 4 and calculate the sample mean.

    asked by satish on April 23, 2010
  66. Statistics

    Six homes are randomly surveyed from a group of fifteen homes. How many different random samples are possible

    asked by Courtney on August 14, 2014
  67. Probability Help

    Forty people are selected at random. What is the probability that none of the people in this group have the same birthday? ​

    asked by Bobbie on December 6, 2016
  68. math

    A number from 11 to 24 is drawn at random. What is the probability that 18 is drawn? Write your answer as a fraction. A) 1/7 b) 1/14 C) 11/24 D) 18/14

    asked by Danny on April 4, 2012
  69. Probability Help

    Fourty people are selected at random. What is the probability that none of the people in this group have the same birthday? ​

    asked by Bobbie on December 8, 2016
  70. Statistics

    Find the probability that for a random sample of 4 states the sample mean x is between 475 and 525

    asked by Juan on February 12, 2013
  71. calculus

    3 letters are chosen at random from the letters P, A, N, S, O, L. What is the size of the sample space of this experiment? 12 10 20 30 35

    asked by king chris on November 27, 2012
  72. math

    if 2 socks are chosen at random,what is the probality of getting first a black sock and then a blue sock?

    asked by ahmedin on March 5, 2013
  73. Statistics

    According to a poll, 20% of adults smoke. In a random sample of 75 adults, 30 are smokers. Is this unusual?

    asked by Anonymous on April 6, 2011
  74. Math Help

    Two people are selected at random from a group of 6 pilots and 4 engineers. What is the probability that both of them are engineers?

    asked by KiKi on June 11, 2015
  75. Math

    Two people are selected at random from a group of 6 pilots and 4 engineers. What is the probability that both of them are engineers?

    asked by KiKi on June 11, 2015
  76. business math

    3 cards are drawn simultaneously at random from a standard deck. Find the probability that all the cards are hearts.

    asked by cmb on November 3, 2010
  77. Math

    A hospital nursery has 3 boys and some girls. A child was selected at random what is the probability that the child is a boy?

    asked by Anaa on December 3, 2016
  78. Statistics

    Graduation rate for students in a program is 80%. If 10 students from it are selected at random, find the probability that AT LEAST 8 of them graduated.

    asked by Janelle on October 21, 2014
  79. Math

    Coins numbered 1-200 are placed in a hat. What is the probability that a coin chosen at random out of the hat is a multiple of 6 or 9?

    asked by Kristen on January 23, 2014
  80. Urgent!

    A hospital nursery has 3 boys and some girls. A child was selected at random what is the probability that the child is a boy?

    asked by Anon on December 3, 2016
  81. math

    A jar contains 8 red, 24 purple, 18 violet, and 24 yellow marbles. A marble is drawn at random. P(yellow) I think 24/74

    asked by Anonymous on March 13, 2014
  82. Stats

    The unemployment rate in a city is 9%. Find the probability that at least 2 out of 8 people from this city sampled at random are unemployed.

    asked by LiCee on October 28, 2010
  83. math

    . A box contains five blue, eight green, and three yellow marbles. If a marble is selected at random, what is the probability that it is not blue?

    asked by CC on June 10, 2011
  84. math

    A container has 26 orange, 23 pink, 16 blue, and 24 violet marbles. A marble is drawn at random. P(violet) I think 24/89

    asked by Anonymous on March 13, 2014
  85. math

    A jar contains 21 red, 4 black, 12 orange, and 18 pink marbles. A marble is drawn at random. P(black) I think 4/55

    asked by Anonymous on March 13, 2014
  86. statistics

    A random variable X is best described by a continuous uniform distribution from 20 to 45 inclusive. The standard deviation of this distribution is approximately

    asked by Anonymous on August 17, 2011
  87. math

    A box contains five blue, eight green, and three yellow marbles. If a marble is selected at random, what is the probability that it is yellow? 1 3/16 3/8 1/3

    asked by chris allen on November 19, 2009
  88. prealgebra

    you play a CD that has 11 songs using the random setting find the probability that the CD player plays songs 3 first and then song 5.

    asked by vivkvivkf on April 12, 2012
  89. math

    let two stochastically independent random variables y1 and y2 with the distribution b(100,p1) and b(100,p2) respectively,y1=50 and y2=40 ,find 90% a confidence interval for p1-p2 ?

    asked by assma on February 23, 2015
  90. math

    A box contains five blue, eight green, and three yellow marbles. If a marble is selected at random, what is the probability that it is not blue?

    asked by free on May 13, 2012
  91. statistics

    a quiz had 6 questions, each with 4 possible answers (only one of which is correct). If you answer them at random, find the probability that all are correct and at least one is wrong.

    asked by tiffany on March 17, 2014
  92. statistics

    A random sample of n= 12 is drawn from a population that is normally distributed, and the sample variance is s©÷ = 19.3. Use ¥á = 0.025 in testing ¥Ç₀ : ¥ò©÷ ¡ 9.4 versus ¥Ç©û : ¥ò©÷ > 9.4

    asked by Yadira M on August 13, 2009
  93. sdsdd

    box contains 100 bolts of which 9 are defective. Find the probability that a bolt chosen at random is not defective.

    asked by Anonymous on January 12, 2017
  94. Math-probability

    One card is selected at random from a deck of cards. Determine the probability that the card is a black heart.

    asked by Jen on July 19, 2011
  95. math

    from an ordinary deck of 52 cards, a single card is selected random. what is the probability that it is a 10 or red card?

    asked by kamleen on July 14, 2010
  96. math

    A jara has 25 green grapes and 75 purple grapes. what is the probability that a purle grape will be chosen at random?

    asked by Andrea on April 4, 2013
  97. math

    80% of the American population likes pizza. If 8 Americans are chosen at random, find the probability that 6 of them like pizza.

    asked by jon on June 29, 2014
  98. Statistics

    How would I find the confidence level (in %) if I am given the standard deviation, size of the random sample, and confidence interval?

    asked by C on April 3, 2013
  99. statistics

    If random samples, each with n = 36 scores, are selected from a normal population with m = 80 and s = 18, how much difference, on average, should there be between a sample mean and the population mean?

    asked by Anonymous on October 20, 2010
  100. statistics

    in a scientific study there are 8 pigs 5 of which are pregant if 3 are selected at random without replaement find the probability that all are pregant

    asked by joe on October 13, 2010