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Forum: Probability

Probability course and homework discussion. Probability distributions. Probability theory, stochastic processes

  1. Arrow Sticky Thread Sticky: We only provide homework help to those who show effort

    Welcome to Talk Stats Forum. In order to keep homework help effective and efficient, we request all members to abide by these guidelines: 1)...

    Started by quark‎, 09-30-2005 09:44 AM
    • Replies: 0
    • Views: 30,250
    09-30-2005, 09:44 AM Go to last post
  1. probability

    Can anybody help me to solve this problem ?please :( 1-In a certain community, 50% of the people have disease A, 15% have disease B and 5% have...

    Started by meme‎, 03-18-2006 07:42 AM
    • Replies: 6
    • Views: 4,242
    04-03-2006, 11:06 AM Go to last post
  2. Need help with probability

    A local public-action group solicits by telephone. For a particular list of prospects, it was estimated that for any individual, the probability was...

    Started by anthonys‎, 04-01-2006 01:21 AM
    • Replies: 2
    • Views: 3,704
    04-03-2006, 12:40 PM Go to last post
  3. basic probability question

    Probability of 12 defects in one batch = 0.3060 If two more batches are produced, find the probability that all 3 batches will contain at least 12...

    Started by davidfsmith‎, 04-02-2006 03:14 PM
    • Replies: 2
    • Views: 2,650
    04-03-2006, 03:00 PM Go to last post
  4. one question

    well, I did post this in another forum, but I just realized I probably should have posted it here. I've just been having trouble with this one...

    Started by AcidicBassist‎, 04-04-2006 08:39 AM
    • Replies: 1
    • Views: 2,475
    04-04-2006, 02:24 PM Go to last post
  5. Probability help

    In a meat packaging plant, Machine A accounts for 60% of the plant’s output while Machine B accounts for 40% of the plant’s output. 1% of the...

    Started by Taka‎, 04-01-2006 05:38 AM
    • Replies: 6
    • Views: 3,241
    04-05-2006, 09:55 AM Go to last post
  6. Help on probability

    Probability of 12 defects in one batch = 0.3060 If two more batches are produced, find the probability that all 3 batches will contain at least 12...

    Started by davidfsmith‎, 04-04-2006 08:23 AM
    • Replies: 4
    • Views: 2,689
    04-05-2006, 10:01 AM Go to last post
  7. Uniform Distribution

    Can a probability P(X=.2) be found using a Uniform Distribution? Or just P(x<.2) and P(x>.2). Can area be finite?

    Started by wrohrer‎, 04-05-2006 11:38 AM
    • Replies: 1
    • Views: 3,465
    04-05-2006, 02:48 PM Go to last post
  8. Stats assignment totally lost on 1 quesiton.

    Hi Guys I'm new here so Hi to everyone. Anyway I have done the rest of the questions easily but stuck on this one: “Cascade Paint” mixes...

    Started by HiAll‎, 04-05-2006 05:16 AM
    • Replies: 5
    • Views: 2,858
    04-06-2006, 08:07 AM Go to last post
  9. Question Normal Distribution

    Assume x has a normal distribution, and find the indicated probability. The mean is 200, standard deviation 50. Find the following probability: ...

    Started by mayday‎, 04-08-2006 12:28 PM
    • Replies: 3
    • Views: 3,427
    04-08-2006, 02:59 PM Go to last post
  10. Is anyone good with Monty Hall problems?

    I have a Monty Hall problem with 10 doors behind two doors are prizes. Monty must show two non winning doors and can not show you what is behind the...

    Started by maggie2‎, 04-09-2006 04:25 PM
    • Replies: 2
    • Views: 3,064
    04-10-2006, 10:25 AM Go to last post
  11. 2 probability question

    I have just recently been learning probability and I have been having troubles with some questions. If someone can help me on these two question, I...

    Started by munkeyb0i‎, 04-10-2006 07:49 PM
    • Replies: 1
    • Views: 3,658
    04-11-2006, 07:54 AM Go to last post
  12. My brain is oozing out of my head!

    I am very lost. I have read my notes and text book but this teacher has me very confused. Can anyone fill me in? The number of semester hours of...

    Started by ot180‎, 04-11-2006 10:21 PM
    • Replies: 1
    • Views: 4,184
    04-11-2006, 10:39 PM Go to last post
  13. I never knew calculating probability was so difficult!

    I'm having a really hard time wrapping my mind around these questions! I think I might be thinking of this too simplistically. If someone could...

    Started by maggie2‎, 04-09-2006 03:57 PM
    • Replies: 4
    • Views: 3,193
    04-12-2006, 08:36 AM Go to last post
  14. Unhappy Realing struggling

    I know this is probably a simple problem, but I can't seem to wrap my brain around it. Here it is: You are dealt 5 cards from a well shuffled,...

    Started by jjmeans‎, 04-15-2006 07:00 PM
    • Replies: 0
    • Views: 2,917
    04-15-2006, 07:00 PM Go to last post
  15. Exclamation Yet more problems!!!

    OK. Like I said. I am really struggling with this. Here are two more I can't grasp. 1. You are fishing at a Reservoir. The Department of...

    Started by jjmeans‎, 04-15-2006 07:08 PM
    • Replies: 0
    • Views: 2,077
    04-15-2006, 07:08 PM Go to last post
  16. here is another one

    I have done this a million times with the same result... it is apparently incorrect but I cannot figure out why... what percentage of a circle will...

    Started by elce‎, 04-15-2006 11:10 PM
    • Replies: 1
    • Views: 2,431
    04-15-2006, 11:18 PM Go to last post
  17. Exclamation Help me please!!

    This may seem like an easy problem, but I have been racking my brain for hours trying to find the solution. I know the answer to the problem is...

    Started by JohnigaS‎, 04-16-2006 07:31 PM
    • Replies: 1
    • Views: 2,332
    04-17-2006, 10:15 AM Go to last post
  18. Help! - Probability Problem

    I need some help with this one: A company is considering implementing one of two quality control plans for monitoring the weights of automobile...

    Started by webcrawler‎, 04-17-2006 03:55 PM
    • Replies: 1
    • Views: 7,746
    04-18-2006, 06:48 AM Go to last post
  19. Permutation or Combination? Who knows? How to know?

    I think I have a decent understanding of the difference btwn permuation and combination. But occasionally a word problem comes up that throws me a...

    Started by ckbeme‎, 04-16-2006 04:51 AM
    • Replies: 2
    • Views: 6,093
    04-18-2006, 04:35 PM Go to last post
  20. first timer

    hi guys, this is my first post here...i decided to come here cos i really am stuck with a bunch of question in an assignment for probabilities that i...

    Started by cappa‎, 04-19-2006 12:10 AM
    • Replies: 1
    • Views: 2,979
    04-19-2006, 09:50 AM Go to last post
  21. Probability involving stock market help pls

    Stock A and stock B. Every day the price of stock A will either increase by 1 dollar with probability 0.6 or decrease by one dollar with...

    Started by -illuzion-b18c1‎, 04-19-2006 04:59 PM
    • Replies: 0
    • Views: 3,553
    04-19-2006, 04:59 PM Go to last post
  22. Question Probability

    You have applied for a summer job at Store A and also at Store B. You estimate that probabilities of getting the job at the stores A and B are 0.1...

    Started by jburklund‎, 04-19-2006 01:02 PM
    • Replies: 1
    • Views: 2,828
    04-20-2006, 09:06 AM Go to last post
  23. Probability Question

    A mortgage company knows that 8% of its loan recipients default within the first five years. To be profitable the company must have no more than 25...

    Started by pla0812‎, 09-19-2005 10:49 AM
    • Replies: 4
    • Views: 3,268
    04-20-2006, 08:52 PM Go to last post
  24. Normal Distribution Problem

    I'm having trouble getting this one started: Jake runs the concession stand for a Chicago area minor league baseball team. He knows that hot dog...

    Started by ktgurrl‎, 04-20-2006 08:58 PM
    • Replies: 0
    • Views: 3,393
    04-20-2006, 08:58 PM Go to last post
  25. Question Conditional Probability and Variance

    In a conditional probability problem, I have computed Var(X|Y=y) for all values of y. How would I go about computing the Var(X) using this...

    Started by ProbabilityPrincess‎, 04-20-2006 09:59 PM
    • Replies: 0
    • Views: 3,964
    04-20-2006, 09:59 PM Go to last post
  26. Exclamation Help! Test Tomorrow

    O.K. Here is my question that I am struggling with: Of all college freshman that try out for the track team, the coach will accept only 30%. If 15...

    Started by jjmeans‎, 04-20-2006 11:24 PM
    • Replies: 0
    • Views: 5,089
    04-20-2006, 11:24 PM Go to last post
  27. poisson process probability distributions

    Started by macro90‎, 04-20-2006 11:56 PM
    • Replies: 0
    • Views: 3,061
    04-20-2006, 11:56 PM Go to last post
  28. Prob w/Combination of At Least AND Combination

    I'm stuck on this. I've had similar probs, but none that combine the At Least with this type of selection. I really hate to ask for help on a...

    Started by ckbeme‎, 04-21-2006 05:40 PM
    • Replies: 5
    • Views: 10,407
    04-23-2006, 08:38 AM Go to last post
  29. Standard Normal Variable Z ... I do not understand

    :confused: Hi, This is not a homework question as I have the answer, just trying to figure out the method; I have a "Normal Distribution...

    Started by thedealer‎, 04-23-2006 02:25 PM
    • Replies: 2
    • Views: 19,033
    04-23-2006, 02:33 PM Go to last post
  30. Stuck on Setting upa problem.

    I been having a problem solving this type of question. I have the answers to this along with variations of the same problem, but I am still un able...

    Started by sublime‎, 04-24-2006 08:05 PM
    • Replies: 1
    • Views: 6,372
    04-24-2006, 08:57 PM Go to last post
  31. Cool Permutations

    I'm having trouble with this one: In how many different was can the letters of the word "BLUEBERRY" be arranged? I got 7,560? Is that what...

    Started by GeorgeBurns‎, 04-23-2006 12:04 PM
    • Replies: 4
    • Views: 3,428
    04-25-2006, 02:12 PM Go to last post
  32. Exponential Probability

    Data are observed on lifetime of 5 electronic units (in hundreds of hours): 6.7, 5.0+, 6.1, 8.0, 10.0 where the "+" denotes that the unit's...

    Started by skip_it2‎, 04-26-2006 10:16 AM
    • Replies: 0
    • Views: 2,545
    04-26-2006, 10:16 AM Go to last post
  33. Binomial Distribution

    I am struggling with statistics (now, there's a first!) I am working in binomial distribution and trying to determine probability of rolling a...

    Started by Sully‎, 04-25-2006 10:11 PM
    • Replies: 2
    • Views: 3,101
    04-26-2006, 11:03 PM Go to last post
  34. Question mathematical expectation

    A despondent math professor is traveling to Las Vegas to bet his entire life savings, $20,000, on one roll of the (two) dice. If the total is 7 or...

    Started by summertigger‎, 12-18-2005 09:16 PM
    • Replies: 4
    • Views: 4,763
    04-27-2006, 10:47 AM Go to last post
  35. Unhappy finding probability

    According to the Bureau of Navel Standards, 75 percent of all people are "inners," (that is their belly buttons poke inward); everyone else is an...

    Started by summertigger‎, 12-18-2005 09:21 PM
    • Replies: 7
    • Views: 5,144
    04-27-2006, 01:03 PM Go to last post
  36. Thanks to John M & more questions

    Thanks to John M for all of his help! I have several more questions that I got wrong answers on and would like to know the correct answers if anyone...

    Started by orangeb‎, 02-08-2006 07:26 AM
    • Replies: 8
    • Views: 3,239
    04-27-2006, 01:42 PM Go to last post
  37. Angry hypergeometric probabilty distribution

    I have been trying to figure this out for a week... we have 20 runners and of these 20, 10 prefer adidas, 6 nike, and 4 k swiss. if we take 10 of...

    Started by elce‎, 04-15-2006 08:37 PM
    • Replies: 3
    • Views: 2,906
    04-29-2006, 04:21 PM Go to last post
  38. Exclamation Bayes- Please God let me be right!

    A person chosen at random from the population of a given city is given a chest X-ray, and the results turn out to be “positive” For the sake of...

    Started by elce‎, 04-15-2006 11:41 PM
    • Replies: 3
    • Views: 2,466
    04-29-2006, 07:17 PM Go to last post
  39. Solving for "b" when I know normal distribution of x

    I submitted the following for a quiz and was told it was incorrect. I reviewed the section and started fresh, only to come back to the same answer. ...

    Started by Sully‎, 04-30-2006 12:33 PM
    • Replies: 2
    • Views: 2,266
    04-30-2006, 01:02 PM Go to last post
  40. Question New to statistics, but I am trying

    I have been working on this problem for two days, I cannot come up with the correct way to work it. My instructor did not teach this type. The...

    Started by stangerald‎, 05-01-2006 09:03 AM
    • Replies: 1
    • Views: 4,786
    05-01-2006, 09:30 AM Go to last post
  41. probability problem

    Good Afternoon! I'm really glad I found this site, because I have thought myself into a corner! I am a Grade 8 and 9 science teacher and have...

    Started by michellebelliveau‎, 04-27-2006 01:00 PM
    • Replies: 5
    • Views: 2,864
    05-01-2006, 12:24 PM Go to last post
  42. Probability of Independent Event

    :wave: I was hoping someone can help me set up this problem. I don’t need the answer just how to set up the first step: A test consists of 10...

    Started by lightfoot‎, 05-03-2006 11:15 AM
    • Replies: 2
    • Views: 3,127
    05-03-2006, 03:54 PM Go to last post
  43. Probability/Counting Rules Help

    Hey: Would anyone know how to approach these two problems below? Many thanks in advance. A sales company purchases 15 new chars for its top...

    Started by skhan‎, 05-05-2006 09:44 PM
    • Replies: 2
    • Views: 5,228
    05-06-2006, 04:33 PM Go to last post
  44. Distribution Questions

    Hi guys, having trouble with these... dont quite understand.. When you have a: Uniform Distribution Right Skewed Distribution Left skewed...

    Started by JVC‎, 05-05-2006 01:41 AM
    • Replies: 2
    • Views: 2,624
    05-07-2006, 08:04 AM Go to last post
  45. Standard Deviation

    I'm tearing my hair out over this Stats problem: Age at onset of dementia was determined for a sample of adults between the ages of 60 and 75. For...

    Started by Kylah‎, 05-08-2006 10:06 AM
    • Replies: 1
    • Views: 2,855
    05-08-2006, 10:16 AM Go to last post
  46. baby probability help

    Hi, with this problem "Tom flips 3 fair coins and Joan flips 2 and Tom wins if he gets more heads than her. What is probability that Tom wins?" At...

    Started by probber‎, 05-08-2006 02:49 PM
    • Replies: 9
    • Views: 3,046
    05-10-2006, 08:22 AM Go to last post
  47. probability

    A project director runs a staff consisting of 6 scientists and 3 lab technicians. Three new projects have to be worked on and the director decides to...

    Started by aptiva‎, 05-10-2006 04:32 PM
    • Replies: 1
    • Views: 2,671
    05-10-2006, 07:17 PM Go to last post
  48. Angry Please help!

    Hello, I recently started a statistics class and I'm really struggling with it. I feel so dumb. I read the assigned chapters and they make...

    Started by half-life‎, 05-14-2006 08:34 PM
    • Replies: 5
    • Views: 2,665
    05-14-2006, 09:50 PM Go to last post
  49. prob word problem Q

    A growing manufacturing company has kept careful records of applicants who have applied for jobs on their assembly lines. The probability that a new...

    Started by aptiva‎, 05-15-2006 10:43 PM
    • Replies: 1
    • Views: 2,923
    05-16-2006, 12:10 PM Go to last post
  50. figuring out a cutoff value

    :confused: Hello :confused: Since my teacher hasn't replied to any of my e-mails, I could use some help related to continuous probability...

    Started by half-life‎, 05-16-2006 10:28 PM
    • Replies: 1
    • Views: 7,894
    05-19-2006, 12:20 PM Go to last post
  51. word problems

    Here are a few more questions that I got wrong and need help figuring out if anyone could help. Question 1: The length of time for students to...

    Started by orangeb‎, 02-08-2006 07:57 AM
    • Replies: 3
    • Views: 4,055
    05-19-2006, 12:21 PM Go to last post
  52. tricky probability

    bob wants to borrow the family car tonight to go on a date with his girlfriend. Bob knows that there is a 30% chance that the car will be avaliable,...

    Started by skhan‎, 05-21-2006 02:20 PM
    • Replies: 2
    • Views: 3,190
    05-21-2006, 04:12 PM Go to last post
  53. Bernoulli Principle

    I'm sorry this question is vague, but can anyone explain the basic equation and steps used for the Bernoulli Principle? I understand the equation: ...

    Started by kateisgo‎, 05-21-2006 08:21 PM
    • Replies: 1
    • Views: 2,582
    05-21-2006, 09:26 PM Go to last post
  54. Uniform Dist.

    Hey, havin a bit of trouble on this question, not quite sure what to do If X is uniformly dist. over a range of values 8 to 21 pr(X>=7)? Do...

    Started by catch22‎, 05-22-2006 06:51 PM
    • Replies: 2
    • Views: 2,597
    05-23-2006, 04:12 AM Go to last post
  55. probability geneticist

    I was able to answer the first 3 parts of this question but i cant figure out the last one A geneticist has bred three different strains of...

    Started by aptiva‎, 05-23-2006 12:14 PM
    • Replies: 1
    • Views: 2,741
    05-24-2006, 08:02 PM Go to last post
  56. P Value

    38 of 120 high school students work over 20 hours per week. Does this demonstrate that more than 25% of high school students work over 20 hours...

    Started by Sully‎, 05-24-2006 11:39 PM
    • Replies: 0
    • Views: 3,138
    05-24-2006, 11:39 PM Go to last post
  57. another probability

    this question has three parts and once again I was able to answer part A and B by drawing the tree diagram but I cant seem to figure out part C ...

    Started by aptiva‎, 05-23-2006 12:26 PM
    • Replies: 2
    • Views: 2,650
    05-25-2006, 09:05 PM Go to last post
  58. probability distribution

    A keyring contains 4 keys that appear to be identical, although only one will open a particular door. Describe the probability distribution of X: ...

    Started by skhan‎, 05-25-2006 12:16 AM
    • Replies: 1
    • Views: 2,775
    05-29-2006, 03:09 PM Go to last post
  59. Normal distribution and intervals

    I keep turning these around and am hoping I am on the right track Distribution of raw scores has mean=581 and sd=70. Find the interval of...

    Started by Sully‎, 05-24-2006 10:56 PM
    • Replies: 1
    • Views: 2,264
    05-30-2006, 10:10 AM Go to last post
  60. random variables/probability distributions

    nevermind:)

    Started by Michelle‎, 06-01-2006 08:34 PM
    • Replies: 0
    • Views: 2,176
    06-01-2006, 08:34 PM Go to last post

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