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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 10:44 AM
    • Replies: 0
    • Views: 19,282
    09-30-2005, 10:44 AM Go to last post
  1. Different solutions when using direct calculation and Chebychev's inequality

    Hi all, I have a question that I can't find answer to: I have 10 random variables X1, X2....X10 which are all independent and exponentially...

    Started by stasezer‎, 02-22-2017 11:39 AM
    chebychev's inequality, probability density
    • Replies: 1
    • Views: 164
    02-23-2017, 06:05 PM Go to last post
  2. Fixing the low value and high value in a probabilistic simulation

    Hi, When doing repeated random sampling in a monte carlo method, is there a defined procedure to fixing the low value and high value of the...

    Started by depakroshanblu‎, 02-20-2017 08:58 AM
    • Replies: 10
    • Views: 312
    02-23-2017, 03:33 PM Go to last post
  3. Probability of storm surge given parameters for hurricanes.

    I've been working through some statistics problems and could use a little guidance on how to arrive at the right answer (and more importantly, why...

    Started by Foxhound013‎, 02-18-2017 05:35 PM
    • Replies: 4
    • Views: 240
    02-23-2017, 01:00 AM Go to last post
  4. Card drawing probability

    Hey all, I have been pondering about a problem in excel and cant seem to figure it out :/ Lets assume I have a card deck of 50 cards. My opening...

    Started by CameronNY‎, 02-20-2017 03:29 PM
    • Replies: 5
    • Views: 173
    02-21-2017, 02:47 AM Go to last post
  5. Probability of throwing n different numbers in m throws of a dice

    Folks I know how to calculate the probability of throwing the same number in every throw of a dice (die, if you prefer!), and I know how to...

    Started by Remster‎, 02-20-2017 05:03 AM
    dice, probability
    • Replies: 1
    • Views: 118
    02-20-2017, 11:03 PM Go to last post
  6. Mean waiting time due to aggregation of k poisson arrivals

    Dear Experts: I want to calculate the mean waiting time due to aggregation of k arrivals following poisson process with rate #λ#. Arrivals are served...

    Started by Hallian1990‎, 02-17-2017 05:59 PM
    probabilities, probability distributions, probability function, queuing, queuing theory
    • Replies: 1
    • Views: 173
    02-18-2017, 08:54 PM Go to last post
  7. Probability Question

    Hi Everyone, I'm looking to calculate the probability of the time taken for a specific event. I have: The best case scenario which normally...

    Started by goulding74‎, 02-17-2017 08:58 AM
    lean six sigma, probability
    • Replies: 1
    • Views: 153
    02-17-2017, 03:41 PM Go to last post
  8. Question on sampling without replacement

    Here is a question regarding sampling without replacement. Say there is a class size of 24, and the teacher is breaking students into groups of...

    Started by sjd7aa‎, 02-15-2017 08:30 PM
    • Replies: 1
    • Views: 165
    02-16-2017, 07:25 PM Go to last post
  9. Unhappy Conditional Probability Problem Help!

    Hey guys, I got this question as a practice problem. I believe that it's a conditional probability where I should find the probability of NOT...

    Started by nannan‎, 02-15-2017 09:00 PM
    • Replies: 1
    • Views: 182
    02-15-2017, 11:08 PM Go to last post
  10. MGF of sample mean of IID poisson RVs

    I am given the MGF of IID RVs as e^{\lambda(e^t-1)} and am supposed to find the MGF of their sample mean of n such RVs. I have am arriving at ...

    Started by nsus‎, 02-12-2017 11:02 AM
    mgf, sample mean
    • Replies: 5
    • Views: 323
    02-14-2017, 08:26 PM Go to last post
  11. Question Probability

    (This is a question on probability, not a discussion on politics. Hate or love the President, I hope you all can respond with a mathematical...

    Started by vspinnet‎, 02-13-2017 07:27 AM
    • Replies: 0
    • Views: 179
    02-13-2017, 07:27 AM Go to last post
  12. probability

    probability

    Started by asonibareoyindamola‎, 02-10-2017 07:49 PM
    • Replies: 1
    • Views: 277
    02-10-2017, 08:03 PM Go to last post
  13. Probability to draw an odd number before an even number

    There's 39 numbers in a jar and we're picking them without putting them back. The probability of drawing an odd number and then an even number is...

    Started by TheElder‎, 02-10-2017 06:27 PM
    • Replies: 3
    • Views: 206
    02-10-2017, 08:02 PM Go to last post
  14. Roulette - expected value

    Hello, I want to calculate the expected pay-out of european roulette spins. Particularly, I want to know what is the expected pay-out at the...

    Started by federico.zampini‎, 02-09-2017 11:08 AM
    probab
    • Replies: 3
    • Views: 209
    02-10-2017, 08:28 AM Go to last post
  15. A random variable's median and variance.

    -Part a) A box from 0 to 1 of height 1. What is its median ? Interpretation/Attempt: A random variable, X, is uniform, (So that its density is...

    Started by Kayl‎, 02-09-2017 05:43 AM
    probability mass function
    • Replies: 0
    • Views: 129
    02-09-2017, 05:43 AM Go to last post
  16. What is the difference between classical and bayesian understanding of probability?

    I am reading a book on monte carlo analysis and the author stresses in passing that the definition of probability used in an example in the book is...

    Started by noetsi‎, 02-07-2017 05:47 PM
    2 Pages
    1 2
    • Replies: 22
    • Views: 585
    02-08-2017, 10:28 PM Go to last post
  17. Combining multiple probabilistic weather signals with cumulative binary dist

    If I have a stable of separate, independent models (N = 19 of them) that are using different inputs to each generate a probabilistic forecast for...

    Started by dallasdallas‎, 02-08-2017 09:33 PM
    • Replies: 0
    • Views: 93
    02-08-2017, 09:33 PM Go to last post
  18. Question Probability problem help

    I need help with 2 quizes: first: ...

    Started by zupanii‎, 02-05-2017 12:31 PM
    • Replies: 1
    • Views: 201
    02-05-2017, 12:59 PM Go to last post
  19. Axioms of probability and sigma additivity

    The third axiom of probability states that given an infinite sequence of mutually exclusive events A1, A2, .... we have P(A1 U A2 U ...) = P(A1) +...

    Started by Weiss‎, 01-27-2017 10:05 PM
    additivity, axiom, measure
    • Replies: 6
    • Views: 445
    02-03-2017, 04:06 PM Go to last post
  20. Gambler's ruin problem - modified

    Hi there, I'm a probability newbie. Can anyone help me with the following problem? A player begins with £1 and each round they can wager £1 on...

    Started by federico.zampini‎, 02-01-2017 12:01 PM
    • Replies: 5
    • Views: 356
    02-02-2017, 11:48 AM Go to last post
  21. Probability of how many times one need to throw a coin to get a head twice in a row?

    Hi! New here, first thread! My issue is to explain why the probability function of how many times one need to throw a coin to get a head...

    Started by filippa‎, 01-29-2017 07:10 AM
    • Replies: 3
    • Views: 293
    02-02-2017, 01:52 AM Go to last post
  22. What will be the Probability?

    If a treatment for cancer has 90% success rate, the remaining 10% die. If two patients come for treatment, what is the probability that one will die?

    Started by Dr.Faraz‎, 01-30-2017 01:34 PM
    probability estimate, probability question
    • Replies: 0
    • Views: 155
    01-30-2017, 01:34 PM Go to last post
  23. normal distribution z score problem

    QUESTION: A normal distribution has a mean of 70 and a standard deviation of 15. Determine the value above which 80 percent of the values will...

    Started by subaru537‎, 01-29-2017 04:38 PM
    • Replies: 1
    • Views: 219
    01-29-2017, 09:55 PM Go to last post
  24. Pro / Stat Problems HELP!!!

    In many cases, you can model a binary communication system as follows. A 0 or 1 is chosen as the message and the transmitter sends a signal over a...

    Started by proo2k17‎, 01-29-2017 08:56 PM
    • Replies: 0
    • Views: 176
    01-29-2017, 08:56 PM Go to last post
  25. Dice Total Odds Calculator

    I have posted a calculator to the Google Play Store for computing the probability of obtaing a particular sum when throwing dice:...

    Started by ksoileau‎, 01-29-2017 06:32 PM
    • Replies: 0
    • Views: 173
    01-29-2017, 06:32 PM Go to last post
  26. Simple Z score probability

    QUESTION: The monthly sales of mufflers follow the normal distribution with a mean of 1350 and a standard deviation of 250. The manufacturer...

    Started by subaru537‎, 01-29-2017 04:34 PM
    • Replies: 0
    • Views: 152
    01-29-2017, 04:34 PM Go to last post
  27. Probability of Horse Racing (odds aside)

    Hello In a 10 horse race - if I select two horses in the same race to run either 1st , 2nd or 3rd what are the odds of - one of the horses...

    Started by Mij‎, 01-29-2017 12:00 AM
    • Replies: 0
    • Views: 163
    01-29-2017, 12:00 AM Go to last post
  28. Need help with conditional probability with multiple trials.

    So lets say, a if a tester gives me value of 40, then there is a 30% chance the machine is faulty. If the testers gives me a value of 20, there is a...

    Started by khamaar‎, 01-26-2017 03:25 PM
    • Replies: 2
    • Views: 300
    01-26-2017, 08:41 PM Go to last post
  29. Unhappy Doing Probability through Excel

    Hi everyone! This is my first post here so I hope I am doing it correctly. So I have been given a piece of work from my university in regards to...

    Started by Lundy96‎, 01-24-2017 06:55 AM
    excel, probability
    • Replies: 1
    • Views: 281
    01-26-2017, 08:22 PM Go to last post
  30. Expected value

    I can't figure out how to set this up. The compilation of data is boggling my mind. Do i use the 0,1,2,3,4,5,6,7,8,9 to figure my probabilities? ...

    Started by brainfried78‎, 01-25-2017 12:10 AM
    • Replies: 4
    • Views: 305
    01-25-2017, 09:31 PM Go to last post
  31. Probability Homework problem

    My 7-grade daughter brought this problem home today and having trouble figuring it out. Each box contains a pen with one of four colors, equally...

    Started by bekmonster‎, 01-19-2017 10:41 PM
    conditional probability
    • Replies: 3
    • Views: 420
    01-22-2017, 02:49 PM Go to last post
  32. Probability advice for a rpg

    Hello everyone ! The question I have will look a lot like a math problem, and I have to say, if I was a lath teacher, I would use problems like...

    Started by Yorkblack‎, 01-21-2017 10:23 PM
    • Replies: 0
    • Views: 271
    01-21-2017, 10:23 PM Go to last post
  33. For the following example, is order meaningful or not?

    Consider a hypothetical example. There are 12 tickets for a documentary film and exactly 12 people to buy the tickets (one person can buy only one...

    Started by user1234‎, 01-19-2017 10:24 PM
    combination, combinatorics, permutation, probability
    • Replies: 0
    • Views: 238
    01-19-2017, 10:24 PM Go to last post
  34. Bayesian exercise

    -2 down vote favorite I cant get my head round the following exercise: You are testing dice for a casino to make sure that sixes do not come up...

    Started by randomrun‎, 01-18-2017 09:00 AM
    bayes, bayesian inference, probability
    • Replies: 5
    • Views: 372
    01-18-2017, 01:56 PM Go to last post
  35. Trying To Produce Random Distribution In Excel?

    Hi, Im trying to do some studies in excel to teach myself probabilities and the outcome of a study is pretty much the opposite of what i...

    Started by Tomhgriff1‎, 01-06-2017 03:08 PM
    • Replies: 8
    • Views: 596
    01-17-2017, 11:45 AM Go to last post
  36. Arrival time

    Suppose there are five people, let t1 be the first arrival time which van be computed from min{X1,...,X5} t2 is the time of the next and so on. and...

    Started by karaks5‎, 01-17-2017 05:37 AM
    arrival time, exponential distribution
    • Replies: 0
    • Views: 265
    01-17-2017, 05:37 AM Go to last post
  37. Probability question, I think

    Hoping someone can tell me the kind of question I'm trying to answer, and then point me at an online calculator or formula for such problems, so I...

    Started by vicG‎, 01-13-2017 01:20 PM
    • Replies: 2
    • Views: 355
    01-16-2017, 06:35 PM Go to last post
  38. Train car: probability to have a seat

    A train has got five train cars, each one with N seats. There are 150 passengers who randomly choose one of the cars. What is the probability that...

    Started by Mottler‎, 01-13-2017 01:39 PM
    • Replies: 0
    • Views: 338
    01-13-2017, 01:39 PM Go to last post
  39. Spectral measure

    Hi! Sry for bad english :( I have a problem: A stochastic process is identically equal to one. How does it spectral measure arranged? И на русском:...

    Started by redalertgamer‎, 01-04-2017 06:19 AM
    • Replies: 3
    • Views: 489
    01-13-2017, 05:25 AM Go to last post
  40. Exclamation Bayes Rule!

    Hi, My question is: A company wishes to evaluate the effectiveness of a marketing campaign. Seventy-five percent of all customers using the...

    Started by Zahra98‎, 01-09-2017 07:43 PM
    • Replies: 1
    • Views: 427
    01-09-2017, 08:22 PM Go to last post
  41. Maximum likelihood estimation for exponential distribution

    I would like to describe some gathered data for arrival process which seems not following Poisson distribution for people finding a job. The data...

    Started by karaks5‎, 01-07-2017 09:22 AM
    exponential distribution, maximum likelihood
    • Replies: 0
    • Views: 373
    01-07-2017, 09:22 AM Go to last post
  42. Warning: I know next to nothing about stats and have a question on sample selection

    Hi everyone, I am not sure if I can even articulate my problem clearly, but I need some feedback on whether my concern is valid. In order to...

    Started by oyvey‎, 01-06-2017 08:40 PM
    • Replies: 0
    • Views: 373
    01-06-2017, 08:40 PM Go to last post
  43. Exclamation Teaching chi≤ distribution

    Hello, I would like to explain to students the chi≤-distribution in an inutitive way but I don't know how to do it. All the videos that I watch...

    Started by Eometh‎, 01-02-2017 04:48 AM
    • Replies: 1
    • Views: 604
    01-02-2017, 06:53 PM Go to last post
  44. Pair of dice, normal distribution

    A pair of fair dice rolled 180 times. Use the normal approximation method to find the probability that a total of 7 occurs At least 25 times...

    Started by wajeeha yasin‎, 12-31-2016 09:42 AM
    • Replies: 1
    • Views: 468
    12-31-2016, 11:09 AM Go to last post
  45. Smile Normal Distribution

    Assuming that the number of marks scored by a candidate is normally distributed, find the mean and the standard deviation, if the number of first...

    Started by wajeeha yasin‎, 12-31-2016 09:29 AM
    probability, statisics
    • Replies: 1
    • Views: 472
    12-31-2016, 09:36 AM Go to last post
  46. Calculating probability to construct a random variable probability function

    Hello all, I have this question and I struggle to understand what to do. "There are 2 groups of numbers: A: 2,2,3,3 and B: 5,5,6 A number is...

    Started by Yankel‎, 12-28-2016 03:51 AM
    • Replies: 2
    • Views: 470
    12-28-2016, 08:40 AM Go to last post
  47. Hypothetical draft lottery

    I was trying to devise an equitable MLB draft lottery system which reduces the benefit of "tanking" but heavily weighs record and has a slight...

    Started by nine16‎, 12-27-2016 12:18 PM
    • Replies: 0
    • Views: 422
    12-27-2016, 12:18 PM Go to last post
  48. Calculating the probability of finding pairs of n-letter substrings in DNA

    Hi, I've been struggling a bit with this problem: If I have a sequence of DNA made from letters ATGC which has a length of say 3571 letters,...

    Started by James1984‎, 12-21-2016 07:58 PM
    • Replies: 0
    • Views: 573
    12-21-2016, 07:58 PM Go to last post
  49. picking a present box with more than one characteristicss

    I have a probability problem which is simplified as following, I need to check if my solution is true: If there is a bag contains 20 of small...

    Started by Harith‎, 12-20-2016 06:11 AM
    • Replies: 0
    • Views: 405
    12-20-2016, 06:11 AM Go to last post
  50. NCA Office Pool Win Probability

    Hello, I run a small NCAA office pool website where folks make predictions about the outcome of each game in a 64-team tournament that consists of...

    Started by BustedBracket‎, 12-19-2016 02:12 AM
    code, ncaa, probability, tournament
    • Replies: 0
    • Views: 434
    12-19-2016, 02:12 AM Go to last post
  51. Poisson process: phone calls

    We assume that phone calls arrive according to a Poisson process with rate 2. If I know that up to time t = 1 there is one call only, how likely is...

    Started by endlessend25‎, 12-17-2016 10:19 AM
    poisson process, stochastic process
    • Replies: 1
    • Views: 391
    12-18-2016, 11:41 AM Go to last post
  52. Total and quadratic variation of a function

    Let f(x)= x2−3, for x<3, x2+3, for x≥3 I need to determine the total variation and the quadratic variation of f(x) on the interval . For...

    Started by endlessend25‎, 12-17-2016 10:23 AM
    function, variation
    • Replies: 0
    • Views: 381
    12-17-2016, 10:23 AM Go to last post
  53. Question Solving a LogNormal Conditional expectation equation - Insurance

    Hi everyone, I am a newbie here and apologize if this post is in the wrong forum. I need help to solve the following LogNormal Conditional...

    Started by OLSMAG‎, 12-16-2016 06:33 AM
    conditional expectation, insurance, lognormal
    • Replies: 7
    • Views: 547
    12-16-2016, 11:02 AM Go to last post
  54. Simple but annoying probability question

    A, B and C are in three way race - If the probability of A beating B is p, and the probability of A beating C is q, what is the probability of A...

    Started by katxt‎, 12-08-2016 09:31 PM
    • Replies: 8
    • Views: 887
    12-12-2016, 01:57 AM Go to last post
  55. Number of Possible Orders

    In a regional spelling bee, the 8 finalists consist of 3 boys and 5 girls. Find the number of sample points in the sample space S for the number of...

    Started by jaddy2016‎, 12-11-2016 04:15 AM
    order, permutation, probability
    • Replies: 1
    • Views: 431
    12-11-2016, 07:13 AM Go to last post
  56. Probability Q help, uses combinatorics, Poisson-Distr and possibly Multinomal

    Place successively and independent of each other 20 particles into 10 boxes. Hereby, each of the 10 boxes is chosen with the same probability. a)...

    Started by bkc‎, 12-10-2016 03:05 PM
    poisson, probability
    • Replies: 0
    • Views: 376
    12-10-2016, 03:05 PM Go to last post
  57. Question Real life probability problem

    So I'm wondering if someone can solve this problem for me. Some work was done in our kitchen yesterday and the fridge had to be moved. I noticed some...

    Started by nevsauce‎, 12-10-2016 04:15 AM
    probability
    • Replies: 1
    • Views: 426
    12-10-2016, 07:37 AM Go to last post
  58. Distribution of X+Y of a bivariate normally distributed (X,Y)

    I need to give the distribution of $X+Y$ and $X-Y$ knowing that $(X,Y)$ is bivariate normally distributed with marginal means 1, marginal variances 1...

    Started by endlessend25‎, 11-29-2016 03:48 PM
    marginal, normal distributed, self-study
    • Replies: 1
    • Views: 530
    12-07-2016, 04:19 AM Go to last post
  59. Question Probability that an unknown system corresponds to one of two possible systems

    My problem can be stated as follows: given two different systems S1 and S2, each characterized by a set of parameters, say {p1,p2,...,pN}, what's a...

    Started by washiloo‎, 12-05-2016 01:50 PM
    • Replies: 1
    • Views: 497
    12-05-2016, 02:03 PM Go to last post
  60. Generating a dataset with normal distribution acc. to K-S-test and S-W-test in SPSS

    Iím writing a paper on regression analysis in SPSS, and the data set of the outcome variable is assumed to be normally distributed. Itís a...

    Started by Morten67‎, 12-01-2016 01:22 PM
    • Replies: 12
    • Views: 669
    12-02-2016, 12:44 PM Go to last post

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