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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: 30,343
    09-30-2005, 09:44 AM Go to last post
  1. Question Probability of a string containing a specific substring

    So I've been getting into concepts like the Library of Babel and infinite monkey theorem, and have been trying to work out how to calculate the...

    Started by Chris Morrow‎, 10-14-2011 07:39 PM
    infinite monkeys, library of babel, recursive functions, substrings
    • Replies: 1
    • Views: 6,690
    01-18-2012, 11:22 AM Go to last post
  2. please help me with this question?

    the time it takes for me to reach the university from my home has a normal distribution with mean 45 minutes and standard deviation 15 minutes. I...

    Started by navaniDW‎, 01-18-2012 12:33 AM
    • Replies: 8
    • Views: 2,574
    01-18-2012, 01:30 AM Go to last post
  3. Venn Diagram for Random Variables

    Hi All, I was wondering whether it is possible to represent random variables in venn diagrams. As far as I've read, the distribution of...

    Started by meeta‎, 01-17-2012 10:16 PM
    • Replies: 2
    • Views: 2,157
    01-18-2012, 01:03 AM Go to last post
  4. hi, can anyone please help me with this question?

    An insurance company's records suggest that experienced drivers (those aged over 21) submit claims at a rate of 0.1 per year, and inexperienced...

    Started by navaniDW‎, 01-16-2012 11:04 PM
    • Replies: 13
    • Views: 2,905
    01-17-2012, 10:31 PM Go to last post
  5. Counting probability given the mean and standard deviation

    Hi all :-) I'm trying to find solution to the following problem, could anyone please help ? In response to the increasing weight of airline...

    Started by Honka‎, 01-16-2012 01:19 PM
    • Replies: 3
    • Views: 6,536
    01-17-2012, 04:23 PM Go to last post
  6. Performance Function

    What is performance function?

    Started by af_231‎, 01-16-2012 10:24 PM
    • Replies: 0
    • Views: 1,075
    01-16-2012, 10:24 PM Go to last post
  7. Probability of a player winning a best-of-n contest with a given current scoreline...

    Many sports are played over a best-of-n format, where the first player to reach a specified number games won wins the overall contest. An example...

    Started by marcolan‎, 05-02-2011 10:29 AM
    • Replies: 8
    • Views: 4,792
    01-16-2012, 10:24 AM Go to last post
  8. gambling probability

    Hi guys, hope someone can help... I would like to find out what the probability is of recieving a 2 or a 3 card '21' score from a single deck of...

    Started by Danson‎, 01-16-2012 06:02 AM
    • Replies: 1
    • Views: 1,992
    01-16-2012, 06:57 AM Go to last post
  9. Reverse order probability

    There are 100 balls in a box: 50 red 20 blue 12 green 7 yellow 5 orange 3 purple 2 black 1 white.

    Started by someone1‎, 01-12-2012 04:59 PM
    • Replies: 1
    • Views: 1,598
    01-16-2012, 02:36 AM Go to last post
  10. pdf less than cdf

    Let us consider the standard normal distribution. For most of the negative values the cdf is less than the pdf. eg. cdf(-1)=0.15 while pdf(-1)=0.24....

    Started by jrai‎, 01-13-2012 02:11 AM
    • Replies: 5
    • Views: 2,750
    01-13-2012, 01:58 PM Go to last post
  11. What distribution is this?

    Hi, Looks like a nice forum here, hope you guys help me with this question, this is not a homework one since I am a coder, need to verify it for my...

    Started by tommyle‎, 01-12-2012 06:32 AM
    • Replies: 8
    • Views: 3,039
    01-13-2012, 05:54 AM Go to last post
  12. almost sure convergence

    Hi, I've got this question I'm trying solve for days already. Let Xn be random variable = 2 with prob 1/3 and = 1/2 with prob 2/3 Let Zn be...

    Started by chchamp‎, 01-12-2012 01:38 PM
    • Replies: 5
    • Views: 4,289
    01-13-2012, 04:20 AM Go to last post
  13. probability that mean is less that

    Hi everydoby, I have a data. Now I want ot find the probability that the weibull mean of this data is less that 10. does the result of...

    Started by antonitsin‎, 01-12-2012 03:26 PM
    weibull mean
    • Replies: 0
    • Views: 1,286
    01-12-2012, 03:26 PM Go to last post
  14. Occurrence Probability

    Hello..... Can anyone help me understand the occurrence probability? I am analyzing wind speed by frequency distribution, to do this I fitted wind...

    Started by af_231‎, 01-10-2012 08:57 PM
    • Replies: 2
    • Views: 2,011
    01-11-2012, 10:26 PM Go to last post
  15. Probabilities in a 7-game series

    This probably isn't relevant, but this is not homework help. I'm just a curious adult who hasn't taken a stastics class in a few years so I'm pretty...

    Started by cornonthecob‎, 01-11-2012 03:09 PM
    • Replies: 3
    • Views: 5,102
    01-11-2012, 03:36 PM Go to last post
  16. Joint cumulative distribution defined in a limited area

    Dear all, Probably one of the classic problems but I can not get through it: F(x,y) = kxy for x + y <= 1, x >= 0, y >= 0 Assuming that...

    Started by peg‎, 01-10-2012 07:57 AM
    • Replies: 2
    • Views: 1,914
    01-10-2012, 12:14 PM Go to last post
  17. Density of data

    Hi What is the Density of data? I like understand this concept with data example? thanks

    Started by asangari‎, 01-09-2012 04:23 PM
    • Replies: 3
    • Views: 2,580
    01-09-2012, 08:57 PM Go to last post
  18. Help! Iím baffled with a probability problemÖ..

    Hi, Newby here. I am hoping someone on here can assist with a probability question thatís troubling me. I have three Ďeventsí, in each event...

    Started by RobD‎, 01-09-2012 09:32 AM
    • Replies: 4
    • Views: 65,109
    01-09-2012, 11:39 AM Go to last post
  19. Distribution of xy/z

    Hi can someone please help me find the distribution for xy/z where x,y,z are uniform from 0 to 1 and independent. Having trouble with my set up...

    Started by nubyra‎, 01-02-2012 02:16 PM
    • Replies: 4
    • Views: 4,328
    01-03-2012, 03:42 AM Go to last post
  20. Working out probability for this game

    Rather confusing game ive started playing in the streets. I've been making alot of money from a game called high dice. A 6 sided dice is rolled...

    Started by exsert‎, 12-28-2011 09:42 PM
    • Replies: 2
    • Views: 1,623
    12-31-2011, 10:05 PM Go to last post
  21. Combination or Permutation

    Please see the attached file. I obtained the answer by writing down the outcome sets. I wondered if they were correct. May I ask, how do we compute...

    Started by dEconomist‎, 12-29-2011 12:41 AM
    2 Pages
    1 2
    • Replies: 21
    • Views: 4,671
    12-31-2011, 08:56 AM Go to last post
  22. 15 people (including you) apply for 7 jobs. What are your chances of getting the job?

    Hi :wave: Allow me to extend my thanks to you all for taking the time to visit this thread. I came across this seemingly simple probability...

    Started by cridex‎, 12-29-2011 12:08 PM
    2 Pages
    1 2
    probability question
    • Replies: 16
    • Views: 7,251
    12-30-2011, 02:39 PM Go to last post
  23. stochastic process distribution vs. distributions of subcollections

    Hello, I am looking for a reason why the following would be true: Suppose Y = { Y_t : t = 0, +- 1, +- 2, ... } is a stochastic process. The...

    Started by John Goche‎, 12-30-2011 08:51 AM
    stochastic process
    • Replies: 0
    • Views: 1,905
    12-30-2011, 08:51 AM Go to last post
  24. Possible to extract a percentage distribution from a combined one in this case ?

    Hi, Am curious about a specific problem, about whether it is possible in general to calculate the difference in percentage distributions for eg....

    Started by marge‎, 12-30-2011 01:58 AM
    • Replies: 1
    • Views: 1,643
    12-30-2011, 02:15 AM Go to last post
  25. Sum of 3 independent uniform distributon

    Hi, Can someone please help me solve the following problem Y = X1 + X2 + X3 Xi ~ Uniform(0,1) independent i = 1, 2 3 I need to find...

    Started by nubyra‎, 12-29-2011 09:14 PM
    • Replies: 2
    • Views: 6,073
    12-30-2011, 12:29 AM Go to last post
  26. Question Probability

    The average life of a battery is normally distributed with a mean of 320 hours and a standard deviation of 20hours; what is the probability that the...

    Started by Mukubuta Mubiana‎, 12-29-2011 06:40 AM
    • Replies: 1
    • Views: 1,481
    12-29-2011, 07:19 AM Go to last post
  27. Working out the probability of each participant in a 400 metre race

    I have an opinion on what time I think each participant in a 400 metre race would achieve but I want to turn this opinion in to probabilities for...

    Started by adam2308‎, 12-28-2011 02:33 PM
    • Replies: 1
    • Views: 1,767
    12-28-2011, 03:21 PM Go to last post
  28. A coin thrown probability question

    Hi all I could not explain this question by using "the product rule for independent events" - A coin is thrown four times. What is the probility...

    Started by bryanevil‎, 12-27-2011 08:57 AM
    • Replies: 2
    • Views: 1,938
    12-27-2011, 11:03 AM Go to last post
  29. What is the number of combinations for a 6XN combination lock?

    Hi, does anyone know how to calculate the total number of combinations a 6XN combination lock .i.e. each of the 6 wheel columns has N possible...

    Started by coolcat‎, 12-26-2011 11:39 AM
    • Replies: 5
    • Views: 1,909
    12-26-2011, 02:02 PM Go to last post
  30. calculate the probability of accident.

    Suppose there are seven(distinct) accident occurs in a week. What is the probability that all accidents are occurred on the same day? Pls explain in...

    Started by sanjeev kumar‎, 12-24-2011 01:24 PM
    • Replies: 6
    • Views: 5,725
    12-25-2011, 06:15 PM Go to last post
  31. Probability on a Multiple Choice exam

    Hello, I am not very good at this type of stuff. I thought up something and I was wondering if someone can look over it and tell me if my...

    Started by Paradox‎, 11-27-2010 04:01 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 22,941
    12-25-2011, 07:07 AM Go to last post
  32. Markov Chain probabilities

    I have an example that is solved on one of the pages of wikipedia related to markov chains. I want to know how the probabilities (in bold) are...

    Started by osmankhalid2005‎, 12-24-2011 04:00 PM
    conditional probabilities, markov chains
    • Replies: 1
    • Views: 2,323
    12-25-2011, 03:08 AM Go to last post
  33. Converting instantaneous Reliability at time (t) to normalized failure rate (fpmh)

    Given the reliability at 2100 hours =0.992, then lambda(2100 hours) = -Ln(0.992)=0.008. I need to convert the hazard rate (lambda) for 2100 hours to...

    Started by halfdome‎, 12-21-2011 09:04 PM
    • Replies: 3
    • Views: 3,901
    12-22-2011, 02:13 PM Go to last post
  34. Conditional Expectation Problem

    Hi everyone, I have the following problem to solve and I would appreciate if someone could give me a hint on how to tackle it. Thank you in...

    Started by M4rkov‎, 12-22-2011 07:07 AM
    • Replies: 3
    • Views: 1,904
    12-22-2011, 01:55 PM Go to last post
  35. Basic binomial question (normal curve approximation)

    Hello, Could you please give me some guidance on the question below: 5. A multiple-choice test consists of 25 questions, each with four possible...

    Started by pcampin‎, 12-19-2011 05:14 PM
    • Replies: 4
    • Views: 2,115
    12-20-2011, 01:42 PM Go to last post
  36. Help summing probabilities

    Hi all, I am trying to figure out a way to use probability to estimate the number of customers my business is likely to see again in the future...

    Started by adamjw1‎, 12-19-2011 11:59 PM
    • Replies: 0
    • Views: 1,299
    12-19-2011, 11:59 PM Go to last post
  37. Urgent help needed - what is the probability that a student owns both a car and cell?

    Hi, I am taking an introductory STAT course at UMN. I can't for the love of anything figure out the probability. Here's the question: Suppose...

    Started by Deusdies‎, 12-18-2011 02:51 PM
    • Replies: 1
    • Views: 1,528
    12-18-2011, 03:17 PM Go to last post
  38. Simple combinatorics

    Hi, Just want to check if what i did is correct: A bridge club has 12 members (6 married couples). Four members are randomly selected to form...

    Started by val92‎, 12-18-2011 04:56 AM
    • Replies: 1
    • Views: 1,872
    12-18-2011, 12:08 PM Go to last post
  39. instrument error

    A machine turns out bearings with a radius of 1.0 and a few random samples now show an average of 1.001 with an SD of 0.003. If I want to check...

    Started by Outlier‎, 12-17-2011 10:28 AM
    • Replies: 2
    • Views: 1,612
    12-17-2011, 02:17 PM Go to last post
  40. Question How to express following expectation in form of stabdard pdf and cdf

    Dear, I expressed this expectation E(X-r)=integral(r,infinity) (x-r)f(x)dx as phi(r)+r(1-capital phi(r)) phi is standard pdf capital phi...

    Started by MilosM‎, 12-17-2011 12:03 PM
    • Replies: 2
    • Views: 2,716
    12-17-2011, 01:04 PM Go to last post
  41. A random variable that is a mix of discrete and continuous

    Here's a question we got for homework: It is given that at a certain bank there's 50-50 chance that when you enter there's: - no one waiting...

    Started by Yotam Ohayon‎, 12-17-2011 07:42 AM
    homework, homework help
    • Replies: 1
    • Views: 2,087
    12-17-2011, 10:58 AM Go to last post
  42. π-system and monotone class

    Assume P is a π-system (that is, P is closed under finite intersections) and M is monotone class (that is M is a non-empty collection of subsets of Ω...

    Started by hadiSanji‎, 12-17-2011 05:50 AM
    probability theory
    • Replies: 3
    • Views: 131,911
    12-17-2011, 10:54 AM Go to last post
  43. Basic Binomial Question. Help please.

    **********Please ignore this post, I think I've got it now**************** Hello, The question is: 5. According to a recent poll, 30%...

    Started by pcampin‎, 12-16-2011 02:45 PM
    • Replies: 1
    • Views: 2,058
    12-16-2011, 03:23 PM Go to last post
  44. sigma -fieled

    Let X : \Omega \rightarrow R and F be a class of subsets of R. show \sigma(X^{-1} (F))=X^{-1}(\sigma(F)) where X^{-1} (F)={X^{-1} (A):A\in F}

    Started by hadiSanji‎, 12-16-2011 12:47 PM
    probability theory
    • Replies: 2
    • Views: 2,848
    12-16-2011, 01:25 PM Go to last post
  45. Question Its easy for you pros, but i need help anyways!

    I have a simple stats/probability question. I need a formula to calculate probability of death. Lets say 20% of people with cancer will die this...

    Started by mathStudent‎, 12-15-2011 03:15 PM
    logistic, probability, regression, statistics
    • Replies: 5
    • Views: 2,196
    12-16-2011, 11:23 AM Go to last post
  46. Combining two dependant discrete random variables

    Hi, Iím looking for a way to combine two discrete random variables (which I have as probability distributions). The combination should be the...

    Started by simcc‎, 12-16-2011 03:38 AM
    • Replies: 1
    • Views: 5,356
    12-16-2011, 05:58 AM Go to last post
  47. How to find std. dev. of Probability Distribution using Excel? Help please.

    Hello, I can find the Population std. dev. using the formula and my BAII plus calc, but would like to know how to find the same using an Excel...

    Started by pcampin‎, 12-15-2011 02:10 PM
    • Replies: 1
    • Views: 11,186
    12-15-2011, 02:26 PM Go to last post
  48. Probability Table (2x2) help please

    Hello, I have attached a spreadsheet which includes the question and the table that I made (based on the question). I can't seem to get...

    Started by pcampin‎, 12-15-2011 12:18 PM
    • Replies: 1
    • Views: 1,913
    12-15-2011, 01:10 PM Go to last post
  49. (Simple?) probability question...

    Three coins. One is fair; one is two-headed; one is two-tailed. We pick a coin at random, flip it, and it comes out heads. The probability that...

    Started by jesse2‎, 12-15-2011 11:14 AM
    • Replies: 7
    • Views: 2,374
    12-15-2011, 12:05 PM Go to last post
  50. How to prove that the unconditional MLE from a matched pair model is inconsistent?

    for beta, the log odds ratio. The usual version that we seen using conditional likelihood is log(n_01/n_10) Thanks so much. any hint is...

    Started by hehe1223‎, 12-14-2011 02:39 PM
    • Replies: 3
    • Views: 2,427
    12-14-2011, 08:24 PM Go to last post
  51. Post Random Variable X

    So this question is on my practice final, and the professor provided the work for how to solve it and I cannot figure it out. Suppose that the...

    Started by iain08‎, 12-13-2011 07:34 PM
    random variable, standard deviation, stats
    • Replies: 14
    • Views: 6,569
    12-13-2011, 09:03 PM Go to last post
  52. Joint distribution from marginals (unknown conditional) distributions

    Hi, This is my first post in this forum; I hope someone can help me with this --thanks in advance for reading! I'm trying to find the joint...

    Started by estebanox‎, 12-11-2011 01:00 PM
    joint distribution
    • Replies: 1
    • Views: 1,840
    12-13-2011, 12:51 PM Go to last post
  53. Hypothesis Testing Please Help!

    I have to test for significance at the .05 level. The data given is a table with Drug Use and Death Penalty Support. The values are: Yes to Drug Use...

    Started by StevenTasker‎, 12-12-2011 09:59 AM
    • Replies: 3
    • Views: 2,322
    12-13-2011, 12:37 PM Go to last post
  54. Probability of getting different results when tossing a coin

    Here's a question I got for homework: Here's what I have so far: In every round (time unit) the possible results and so Which means we're...

    Started by Yotam Ohayon‎, 12-12-2011 11:37 AM
    homework, probability distributions
    • Replies: 3
    • Views: 1,640
    12-12-2011, 11:57 AM Go to last post
  55. The minimum of two independent geometric random variables...

    Hi there, here's a question I got for homework (sorry if my translation is a bit unclear): I have no idea where to start, even with the great...

    Started by Yotam Ohayon‎, 12-12-2011 07:46 AM
    random variables
    • Replies: 1
    • Views: 3,267
    12-12-2011, 08:06 AM Go to last post
  56. Probability of next new product not failing after history several failed products

    What is the equation for finding the probability of a new product given 5 previous new products failed? What is the equation for finding the...

    Started by Jgervin‎, 12-10-2011 09:32 PM
    • Replies: 0
    • Views: 1,802
    12-10-2011, 09:32 PM Go to last post
  57. distribution help

    I am just completely failed my online test and my teacher is letting me retake this 20 point question to try and pass...if anybody can help me out I...

    Started by jdhaas3‎, 12-10-2011 01:59 PM
    • Replies: 4
    • Views: 1,816
    12-10-2011, 03:28 PM Go to last post
  58. Hypotheses Testing and Statistical Signifigance

    The problem says, School district scores on a standard IQ test are normally distributed with a mean of 102 and a standard deviation of 12. A...

    Started by jk3nnedy‎, 12-09-2011 11:14 PM
    • Replies: 1
    • Views: 1,390
    12-10-2011, 12:10 AM Go to last post
  59. Poker question

    From a deck of 52 cards, if you pick 3 cards how often will you have a pair but not three of a kind? I'm having a hard time setting this problem...

    Started by PokerStats‎, 12-09-2011 03:22 PM
    • Replies: 0
    • Views: 890
    12-09-2011, 03:22 PM Go to last post
  60. Poisson Approximation

    A sequence of N triples of balls are randomly and independently placed into one of 100 boxes. Each triple of balls consists of a red, white and blue...

    Started by Bobby Smith‎, 12-09-2011 07:41 AM
    • Replies: 2
    • Views: 1,770
    12-09-2011, 09:03 AM Go to last post

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