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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: 30,353
    09-30-2005, 09:44 AM Go to last post
  1. Solve this??

    There are w cakes and n people. The cakes are distributed to people randomly. Find the expected number of cakes a 'i' person can receive. The...

    Started by ackr1201‎, 09-11-2011 11:46 PM
    • Replies: 1
    • Views: 1,886
    09-12-2011, 07:10 AM Go to last post
  2. Please help calculate the odds of this

    First off, let me say I know very little about math and even less about probabilities. I am a father of two teenage boys. One of them gave me a...

    Started by acofgb‎, 12-22-2014 12:55 PM
    • Replies: 11
    • Views: 2,179
    12-23-2014, 05:42 PM Go to last post
  3. Non-linear function of M i.i.d. r.v.

    Hi, I have a hard time with the following problem: I consider a population of M r.v. a_i, i.i.d. I need to study the following r.v. eta defined as...

    Started by acozza‎, 04-29-2009 06:38 AM
    • Replies: 3
    • Views: 2,652
    04-30-2009, 05:33 AM Go to last post
  4. one-sided confidence intervals

    1. Let X1,...,Xn be iid with cdf Fθ, where Fθ(x) = (x/θ)^β for x in . Here β>0 is a known constant and θ>0 is an unknown parameter. Let X(n)= max...

    Started by acroeri‎, 03-27-2012 02:51 PM
    alpha, confidence, pivot
    • Replies: 0
    • Views: 2,546
    03-27-2012, 02:51 PM Go to last post
  5. Kind of unusual problem...

    So this may seem sort of silly but was hoping I could get some help. I am not a very mathematical person but it has interested me a lot recently so...

    Started by AcrylicAce‎, 08-08-2011 12:40 PM
    • Replies: 4
    • Views: 1,847
    08-08-2011, 05:51 PM Go to last post
  6. Help with a probability problem

    You have a deck of 60 cards which contains 4 red and 4 blue cards. You draw 7 cards from the deck, what is the probability that you'll have at least...

    Started by Actree‎, 07-01-2010 09:10 PM
    • Replies: 5
    • Views: 2,999
    07-02-2010, 12:02 AM Go to last post
  7. Joint and Marginal Densities.

    I am having some problems grasping the concept of these joint and marginal densities. It would really help if someone could provide me with an answer...

    Started by Actuarial_Deepika‎, 01-30-2011 01:38 AM
    cdf, data analysis, joint density, marginal density, probability
    • Replies: 1
    • Views: 6,073
    01-30-2011, 02:28 AM Go to last post
  8. Unhappy Discrete Functions and pmf/cdf.

    Suppose that X is discrete with pmf p(0)=p(1)=2p(2) (and zero otherwise). Find the pmf and cdf of X. How would you simulate the random variable X...

    Started by Actuarial_Deepika‎, 01-30-2011 02:48 AM
    • Replies: 0
    • Views: 3,336
    01-30-2011, 02:48 AM Go to last post
  9. Question Joint cdf/pmf- Multinomial Distribution.

    I'll really appreciate if somebody could take time to explain the following question's answer. Suppose that (N1, N2) is multinomial with n=2,...

    Started by Actuarial_Deepika‎, 01-30-2011 02:53 AM
    • Replies: 4
    • Views: 6,980
    01-30-2011, 11:41 PM Go to last post
  10. Joint density. Help!

    Let x and y have the joint density: f(x,y) = 6/7(x+y)^2 for 0<=x<=1 and 0<=y<=1 a.Find the marginal densities of X and Y. . b.By integrating...

    Started by Actuarial_Deepika‎, 01-30-2011 11:56 PM
    joint density, marginal density
    • Replies: 1
    • Views: 6,797
    01-31-2011, 03:01 AM Go to last post
  11. Unhappy Independence of Bivariate Continuos RV's.

    By the two definitions of independence for bivariate continuous RVs: (1) F(x,y)=F_X(x)F_Y(y) and (2) f(x,y)=f_X(x)f_Y(y). Prove that these two are...

    Started by Actuarial_Deepika‎, 01-30-2011 03:01 AM
    bivariate random variable, continuous, independent
    • Replies: 8
    • Views: 3,574
    01-30-2011, 11:44 PM Go to last post
  12. I've been stuck for a while on this part. Help would be really appreciated!

    Let X1, . . . , Xn be IID Exponential(?) random variables. Use mgfs to find the distributionofY =X1 +...Xn.

    Started by Actuarial_Deepika‎, 03-30-2012 12:31 AM
    exponential distribution, mgf, probability distributions
    • Replies: 0
    • Views: 1,923
    03-30-2012, 12:31 AM Go to last post
  13. Exclamation Prob of happening by chance

    Say I have 1000 balls. 50% are blue, 50% are red. Someone trys to convince me they can pick red balls from the bag without looking at the balls. ...

    Started by Adam‎, 04-08-2008 07:02 PM
    • Replies: 9
    • Views: 4,479
    04-22-2008, 09:16 PM Go to last post
  14. Probability question:??

    If I have 2 coins the first coin is a fair coin and sec one is two head. I randomly pick one and toss it twice, the result are both head for two...

    Started by Adam.‎, 02-29-2012 01:16 PM
    • Replies: 8
    • Views: 2,384
    02-29-2012, 06:09 PM Go to last post
  15. Probability a Selection wins the most races

    I have 12 races with 6 participants (Sel'n 1 - Sel'n 6) and below is the probablities on how many wins each selection would get... Sel'n 1 Sel'n...

    Started by adam2308‎, 08-24-2011 03:05 PM
    • Replies: 2
    • Views: 2,422
    08-24-2011, 03:55 PM Go to last post
  16. 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
  17. 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
  18. Trouble with diagnosis probability

    Having an absolute nightmare as part of my Nautical Science Honours course... I'm no statistician! Need to find a solution for this problem, can...

    Started by Adam_D‎, 01-10-2010 09:17 AM
    • Replies: 2
    • Views: 2,691
    01-10-2010, 12:34 PM Go to last post
  19. Weird Probability Problem

    Hi, I'm having trouble with a problem assigned by my teacher that reads: "Assume that you are boarding a flight in which there are five seats and...

    Started by Addlift‎, 10-28-2008 10:14 PM
    • Replies: 5
    • Views: 6,432
    11-01-2008, 03:49 PM Go to last post
  20. Proof the sum of two CDF's is a CDF.

    This is a question my instructor asked in the last midterm exam but nobody was able to solve and he's suggesting it may come out again in the finals:...

    Started by adejames2000‎, 10-18-2013 05:24 PM
    cdf, mathematical statistics, probabilities, probability distribution, proof
    • Replies: 4
    • Views: 3,131
    10-18-2013, 10:02 PM Go to last post
  21. Predicting Score Based On Historical Performance

    Hi all, You will have to forgive my very basic understanding of probability, but any help would be appreciated. Basically I have a system that...

    Started by Admonty‎, 10-26-2016 01:12 AM
    • Replies: 1
    • Views: 1,954
    10-26-2016, 07:18 AM Go to last post
  22. Normal Distribution

    Suppose that in an apartment building run by the Probandstat rental company, the inhabitants's weights follow a normal distribution with mean 73.0...

    Started by adnan86‎, 12-13-2015 09:36 AM
    normal distribution, probability
    • Replies: 1
    • Views: 1,018
    12-13-2015, 12:10 PM Go to last post
  23. Joint probability of random variables. Please help!!

    Three iid random variables, X, Y and Z with normally distribution with known mean and variances. If two pairs are made, X+Y and Y+Z then are they...

    Started by adnaniut‎, 03-11-2010 02:26 PM
    • Replies: 4
    • Views: 3,702
    05-08-2010, 03:41 AM Go to last post
  24. Multivariate normal distribution

    Hi, I want to calculate expected value of a series. Where X = A + 2B +3C + ..... A = bivariate normal B = trivariate normal C =...

    Started by adnaniut‎, 10-19-2010 02:49 PM
    • Replies: 1
    • Views: 2,586
    10-19-2010, 03:47 PM Go to last post
  25. Markov chain

    There are two states, A and B; A is initial state from where Markov chain starts. If 5 out of 8 samples have probabilities P1, we move from A to B....

    Started by adnaniut‎, 11-04-2010 02:47 PM
    • Replies: 4
    • Views: 3,251
    11-04-2010, 04:36 PM Go to last post
  26. Markov chain hitting time

    Hi, I am trying to compute the hitting time of Markov chain. The way I formulated the problem is, what is the time to to hit state j (j in E) for...

    Started by adnaniut‎, 11-24-2012 03:02 AM
    hitting time, markov chain
    • Replies: 2
    • Views: 1,563
    11-24-2012, 04:14 AM Go to last post
  27. Law of Total Expectation

    Suppose a box initially contains 1 red marble and 1 black marble and that, at each time n = 1, 2, ..., we randomly select a marble from the box and...

    Started by adnaps1‎, 02-03-2013 05:51 AM
    • Replies: 3
    • Views: 2,218
    02-03-2013, 04:26 PM Go to last post
  28. Evolution of CDF as more information is gained?

    Hi. Just trying to figure out something for one of my hobbies... I have a PDF that describes the wait time between event 1 (which happens at...

    Started by AdrianB‎, 03-17-2011 09:51 PM
    • Replies: 1
    • Views: 2,630
    03-18-2011, 12:05 AM Go to last post
  29. Distributions and Percentages

    HW problem here. Suppose that when the Slease company overcharges a customer, the distribution of the amount overcharged (expressed as a...

    Started by adumau‎, 10-04-2011 02:47 PM
    • Replies: 1
    • Views: 3,664
    10-04-2011, 05:22 PM Go to last post
  30. Probability distributions that never have a density (not even a mass)

    Hi, the classical example of a distribution that has nowhere a density is Cantor's distribution. Now, I was wondering if we can build other...

    Started by advmc‎, 06-04-2011 08:33 AM
    • Replies: 0
    • Views: 1,707
    06-04-2011, 08:33 AM Go to last post
  31. characterization of multivariate normal distribution by covariances

    Hi, the professor told us that a multivariate normal distribution can be characterized as the only distribution for which zero covariance implies...

    Started by advmc‎, 07-30-2011 03:34 AM
    multivariate normal
    • Replies: 3
    • Views: 3,619
    07-30-2011, 06:50 AM Go to last post
  32. Sigma Algebra Proof

    Hello, I am having trouble with the following probability question, and I would be grateful for some assistance with it. (I have attached it to the...

    Started by AdvoTDV‎, 09-02-2010 08:49 AM
    • Replies: 2
    • Views: 4,296
    09-02-2010, 01:48 PM Go to last post
  33. Probability Problem

    Apologies if my terminology is bad, I haven't done any statistics for years. If this thread is posted in the wrong place, sorry I am new to this...

    Started by adz‎, 07-28-2011 10:40 AM
    • Replies: 7
    • Views: 2,480
    07-28-2011, 11:46 PM Go to last post
  34. Probability for 20 people

    Hi, I'm not a stats student, I'm a university student reviewing some literature and I'm interested in some of the statistics related to it and how...

    Started by ae5‎, 12-16-2010 04:09 PM
    • Replies: 5
    • Views: 4,411
    12-16-2010, 06:55 PM Go to last post
  35. p-value

    Can anyone tell me what a p-value of .000 means in layman terms?

    Started by aeckland‎, 11-05-2007 04:18 PM
    • Replies: 1
    • Views: 9,823
    11-06-2007, 08:25 PM Go to last post
  36. Joint probability distribution functions

    So a joint pdf is of the form P(X,Y) = SS f(x,y) dx dy, where 'S' is the integral symbol. I've got to cook up the pdf for f(x,y), where X and Y...

    Started by Aegis‎, 10-23-2006 11:24 PM
    • Replies: 3
    • Views: 10,413
    10-25-2006, 07:34 PM Go to last post
  37. Probability that an exponential variable is greater than poisson.

    I need help with one problem in my class, the text is taken directly from the book: The life T (hours) of the lightbulb in av overhead projector...

    Started by Aekei‎, 01-30-2008 02:23 PM
    • Replies: 1
    • Views: 5,008
    01-30-2008, 03:43 PM Go to last post
  38. STAT101 Simple-ish Probability

    The mean monthly fee for Internet service is $25, Standard Deviation is $12. If a sample of 33 households is taken, what is the probability that a...

    Started by aenyiema‎, 09-09-2009 11:18 AM
    • Replies: 2
    • Views: 2,372
    09-09-2009, 05:01 PM Go to last post
  39. Probability / Conditional Prob.

    Above is the question I'm trying to figure out.... I'm not sure if I'm correct, but attempting the problems results in: a. P<38 = .92 b....

    Started by Aeokie165‎, 12-18-2007 08:21 PM
    • Replies: 0
    • Views: 2,934
    12-18-2007, 08:21 PM Go to last post
  40. I'm confused about use of a Complement in determining binomial probability

    Hi, I'm working on some homework dealing with binomial probability of inequalities. The problem which has caused me some confusion is stated as...

    Started by AerospaceDoc‎, 09-29-2012 01:49 PM
    • Replies: 1
    • Views: 1,843
    09-29-2012, 04:39 PM Go to last post
  41. Please Help!

    So I missed last weeks lecture in Statistics, but got the homework. I thought I understood what was going on, but maybe not. Here is the problem...

    Started by aeternus14‎, 11-02-2007 07:29 AM
    • Replies: 2
    • Views: 3,802
    11-05-2007, 07:29 AM Go to last post
  42. Conditional Probability

    Hello!!! Can anyone help me with this problem??...please!!! In relation to Equation P(A│B)=P(AB) / P(B) Show that: P(A│B)P(B)=P(B│A)P(A)

    Started by af_231‎, 03-14-2011 10:37 PM
    • Replies: 5
    • Views: 2,698
    03-20-2011, 09:12 PM Go to last post
  43. Please help me!!

    Derive the followings equations:

    Started by af_231‎, 03-15-2011 09:08 PM
    • Replies: 1
    • Views: 2,640
    03-16-2011, 12:40 AM Go to last post
  44. Probability Problem

    Hello everyone!! I need to solve the following problem: Derive the followings equations: - P(AC)=P(AB1C)+...+P(ABNC) -...

    Started by af_231‎, 03-22-2011 08:21 PM
    • Replies: 0
    • Views: 1,958
    03-22-2011, 08:21 PM Go to last post
  45. Theorem of Total Probabilities

    I appreciate your help.

    Started by af_231‎, 03-28-2011 06:49 AM
    • Replies: 1
    • Views: 4,205
    03-28-2011, 10:51 AM Go to last post
  46. 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: 2,012
    01-11-2012, 10:26 PM Go to last post
  47. Performance Function

    What is performance function?

    Started by af_231‎, 01-16-2012 10:24 PM
    • Replies: 0
    • Views: 1,076
    01-16-2012, 10:24 PM Go to last post
  48. How can I calculate the probability in Section A of the attached image??

    Hello all! Please help me with this: I want to calculate the Probability in Section A .... Please see attached image. Assuming that Z (data...

    Started by af_231‎, 03-29-2012 06:24 AM
    • Replies: 3
    • Views: 2,960
    03-29-2012, 08:39 AM Go to last post
  49. probability tree

    Suppose 1 in 25 adults is afflicted with a disease for which a new diagnostic test has been developed. Given that an individual actually has the...

    Started by agclifto‎, 10-05-2007 05:51 PM
    • Replies: 0
    • Views: 4,490
    10-05-2007, 05:51 PM Go to last post
  50. probability of liscense plate

    What is the probability of getting a license plate that has a repeated letter or digit if you live in a state where the scheme is three letters...

    Started by agclifto‎, 10-05-2007 05:57 PM
    • Replies: 1
    • Views: 13,051
    10-06-2007, 08:21 AM Go to last post
  51. probability and binomial random variable

    A state end-of-grade exam in American History is a multiple-choice test that has 50 questions with 4 answer choices for each question. A student must...

    Started by agclifto‎, 10-24-2007 09:44 PM
    • Replies: 0
    • Views: 4,037
    10-24-2007, 09:44 PM Go to last post
  52. Probability, University, Married, Car Insurance, Help!

    Haha, I thought I'd be creative with my title.... let's get some facts straight, this has to do with probability and University but I'm not married...

    Started by agent2421‎, 10-18-2011 01:52 AM
    • Replies: 1
    • Views: 2,608
    10-18-2011, 06:07 AM Go to last post
  53. Need help with probability

    I have a problem that I DO NOT know what method to use to develop the answer here is my attempted solution, but I want affirmation from a pro. Q:...

    Started by agent2592‎, 11-16-2007 11:03 PM
    • Replies: 1
    • Views: 2,836
    11-17-2007, 06:11 AM Go to last post
  54. How to calculate a confidence level per unit in production

    If a manufacturer produces 100,000 boxes a day that are meant to be packed at 110 units per box, but varies from 105 to 115 units per box, what level...

    Started by agp640‎, 11-02-2012 06:41 AM
    • Replies: 0
    • Views: 2,570
    11-02-2012, 06:41 AM Go to last post
  55. Probability from Z-score for a given population?

    Hi there, Apologies in advance for my lack of stats knowledge. We are using some predictive models that do assume a normal distribution but...

    Started by agro‎, 06-16-2012 01:48 AM
    • Replies: 0
    • Views: 1,411
    06-16-2012, 01:48 AM Go to last post
  56. Multiple Criteria, non-binary outcomes

    So, I'm trying to predict outcomes using baseball data. What I want to do is predict the outcome of batted balls based on the following criteria: ...

    Started by agutts6‎, 02-26-2014 12:51 PM
    baseball, conditional probability
    • Replies: 2
    • Views: 1,087
    02-28-2014, 11:47 AM Go to last post
  57. model conversion events

    When a web site visitor purchase a product, this event is called a conversion. I would like to know how to model such conversion events. What methods...

    Started by aha123‎, 09-18-2012 02:04 AM
    • Replies: 1
    • Views: 1,262
    09-18-2012, 10:23 AM Go to last post
  58. The Expectation of a Majority random process

    I want to know the answer of the following question, I will be so thankful if somebody gives me some clues: "We start a random process with Nb blue...

    Started by Ahad_ie2000‎, 03-14-2016 04:50 AM
    • Replies: 1
    • Views: 1,342
    03-15-2016, 10:41 PM Go to last post
  59. Getting standard deviation given probability

    Hi all If you have a mean of 2 and you want to get standard deviation with probability of 90% that the new mean will lie between 1.5 and 2.5. I...

    Started by Ahmed Arnous‎, 06-10-2015 01:08 PM
    • Replies: 4
    • Views: 1,516
    06-10-2015, 03:31 PM Go to last post
  60. Can some one solve this as soon as possible ?!

    Started by Ahmedelwakeel‎, 12-15-2012 07:35 PM
    • Replies: 1
    • Views: 1,602
    12-15-2012, 07:41 PM Go to last post

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