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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: 30,184
    09-30-2005, 09:44 AM Go to last post
  1. 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: 2,901
    05-16-2006, 12:10 PM Go to last post
  2. 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: 2,656
    05-14-2006, 09:50 PM Go to last post
  3. 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: 2,662
    05-10-2006, 07:17 PM Go to last post
  4. 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: 3,034
    05-10-2006, 08:22 AM Go to last post
  5. 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: 2,849
    05-08-2006, 10:16 AM Go to last post
  6. 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: 2,618
    05-07-2006, 08:04 AM Go to last post
  7. 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: 5,209
    05-06-2006, 04:33 PM Go to last post
  8. 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: 3,117
    05-03-2006, 03:54 PM Go to last post
  9. 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: 2,857
    05-01-2006, 12:24 PM Go to last post
  10. 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: 4,772
    05-01-2006, 09:30 AM Go to last post
  11. 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: 2,260
    04-30-2006, 01:02 PM Go to last post
  12. 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: 2,455
    04-29-2006, 07:17 PM Go to last post
  13. 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: 2,890
    04-29-2006, 04:21 PM Go to last post
  14. 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: 3,204
    04-27-2006, 01:42 PM Go to last post
  15. 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: 5,120
    04-27-2006, 01:03 PM Go to last post
  16. 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: 4,728
    04-27-2006, 10:47 AM Go to last post
  17. 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: 3,072
    04-26-2006, 11:03 PM Go to last post
  18. 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: 2,536
    04-26-2006, 10:16 AM Go to last post
  19. 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: 3,406
    04-25-2006, 02:12 PM Go to last post
  20. 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: 6,354
    04-24-2006, 08:57 PM Go to last post
  21. 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: 19,001
    04-23-2006, 02:33 PM Go to last post
  22. 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: 10,358
    04-23-2006, 08:38 AM Go to last post
  23. poisson process probability distributions

    Started by macro90‎, 04-20-2006 11:56 PM
    • Replies: 0
    • Views: 3,051
    04-20-2006, 11:56 PM Go to last post
  24. 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: 5,065
    04-20-2006, 11:24 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: 3,926
    04-20-2006, 09:59 PM Go to last post
  26. 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: 3,379
    04-20-2006, 08:58 PM Go to last post
  27. 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: 3,249
    04-20-2006, 08:52 PM Go to last post
  28. 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: 2,822
    04-20-2006, 09:06 AM Go to last post
  29. 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: 3,537
    04-19-2006, 04:59 PM Go to last post
  30. 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: 2,939
    04-19-2006, 09:50 AM Go to last post
  31. 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: 6,027
    04-18-2006, 04:35 PM Go to last post
  32. 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: 7,707
    04-18-2006, 06:48 AM Go to last post
  33. 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: 2,325
    04-17-2006, 10:15 AM Go to last post
  34. 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: 2,427
    04-15-2006, 11:18 PM Go to last post
  35. 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: 2,070
    04-15-2006, 07:08 PM Go to last post
  36. 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: 2,889
    04-15-2006, 07:00 PM Go to last post
  37. 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: 3,184
    04-12-2006, 08:36 AM Go to last post
  38. 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: 4,164
    04-11-2006, 10:39 PM Go to last post
  39. 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: 3,641
    04-11-2006, 07:54 AM Go to last post
  40. 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: 3,030
    04-10-2006, 10:25 AM Go to last post
  41. 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: 3,397
    04-08-2006, 02:59 PM Go to last post
  42. 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: 2,847
    04-06-2006, 08:07 AM Go to last post
  43. 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: 3,419
    04-05-2006, 02:48 PM Go to last post
  44. 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: 2,681
    04-05-2006, 10:01 AM Go to last post
  45. 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: 3,229
    04-05-2006, 09:55 AM Go to last post
  46. 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: 2,463
    04-04-2006, 02:24 PM Go to last post
  47. 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: 2,636
    04-03-2006, 03:00 PM Go to last post
  48. 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: 3,696
    04-03-2006, 12:40 PM Go to last post
  49. 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: 4,213
    04-03-2006, 11:06 AM Go to last post
  50. Exclamation HELP! Please! Test on Monday!

    :eek: Need help with these two. Have tried and tried and tried. Q1 Recent developments appear to make it possible for couples to dramatically...

    Started by Gia0614‎, 04-02-2006 12:08 AM
    • Replies: 1
    • Views: 4,623
    04-03-2006, 09:01 AM Go to last post
  51. Probability/Factorial

    Stuck on this one! This is the only one out of 15 (in this section) that I just cannot get right. I've tried every formula in this section. Maybe I...

    Started by Gia0614‎, 04-01-2006 01:39 AM
    • Replies: 1
    • Views: 3,910
    04-02-2006, 08:02 PM Go to last post
  52. random sampling question - I need help

    A journalist wanted to learn the views of the chief executive officers of the 500 largest United States corporations on program trading of stocks. In...

    Started by anthonys‎, 03-15-2006 02:24 AM
    • Replies: 2
    • Views: 2,404
    04-01-2006, 01:20 AM Go to last post
  53. binomial distribution question

    A currier service receives parcels and forwards them to their destination. The aim is to forward all parcels within 24 hours but is not always...

    Started by craig1234‎, 03-27-2006 05:03 PM
    • Replies: 1
    • Views: 2,710
    03-28-2006, 04:13 PM Go to last post
  54. Poisson Distribution

    Can anyone help me with this poisson question The number of spelling errors per 1000 words made by a typist has a Poisson distribution with a mean...

    Started by craig1234‎, 03-26-2006 09:30 AM
    • Replies: 3
    • Views: 2,866
    03-27-2006, 01:32 PM Go to last post
  55. Distribution functions

    Hi people, I am new here and need a help ! Actually this question is taken from home work in the "statistical inference" course, but it's the...

    Started by WeeG‎, 03-20-2006 02:45 PM
    • Replies: 3
    • Views: 3,101
    03-26-2006, 01:50 PM Go to last post
  56. Confused about a question!

    I have a question that i'm having a really hard time even starting. The IT department runs 3 redundant computer servers concurrently. For each...

    Started by maggie2‎, 03-22-2006 10:40 AM
    • Replies: 1
    • Views: 2,866
    03-25-2006, 03:33 PM Go to last post
  57. Probablity Distribution

    So here is my assignment: A red die and a blue die are rolled together. Define X to be the max. of the two #'s rolled. For example, if the red die...

    Started by southernpride9‎, 03-21-2006 08:18 PM
    • Replies: 2
    • Views: 3,649
    03-22-2006, 10:28 AM Go to last post
  58. Stats Homework

    I am getting ready for my test in a couple of hours actually, but I have a practice test I am attempting now. Their are 2 problems I can't seem to...

    Started by Lysolchip‎, 03-21-2006 05:59 PM
    • Replies: 1
    • Views: 4,359
    03-21-2006, 09:01 PM Go to last post
  59. Question HELP studying for a FINAL EXAM

    Hello everyone, I have a final that I am studying for, the final isnt till thursday. But I am having problems soving some probability problems, I...

    Started by Ayisha‎, 03-20-2006 06:39 PM
    • Replies: 0
    • Views: 2,531
    03-20-2006, 06:39 PM Go to last post
  60. Combination question...

    A combination lock has a total of 4 rows of numbers(0-9) and will unlock with the proper 3 - number sequence. How many possible combinations exist?...

    Started by neone4fun‎, 03-19-2006 05:14 PM
    • Replies: 1
    • Views: 2,494
    03-20-2006, 11:44 AM Go to last post

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