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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: 20,021
    09-30-2005, 09:44 AM Go to last post
  1. Probability and roundoff errors

    Hi, I work on a real life problem with roundoff errors and found a glitch in my thinking. If someone knows how to solve this problem I appreciate...

    Started by jcarne‎, 03-21-2017 04:34 PM
    • Replies: 0
    • Views: 103
    03-21-2017, 04:34 PM Go to last post
  2. Basic probability distribution table problem

    "What is P(X>4.74)". Can someone please explain how I'd go about this? Would it just be P(5) + P(6)? Thanks a lot.

    Started by touran‎, 03-19-2017 01:49 PM
    • Replies: 1
    • Views: 145
    03-19-2017, 02:51 PM Go to last post
  3. Union and intersection

    43% of adults are stockholders. 75% of adult stockholders have some college education. 37% of adults have some college education. An adult is...

    Started by Regulus‎, 03-14-2017 10:06 PM
    • Replies: 5
    • Views: 305
    03-18-2017, 06:05 PM Go to last post
  4. Urgent: Probability of having Lyme Disease and Bayes theorem

    I recently found a deer tick on me (had been there for several days). I have no symptoms. My Dr. says I could ignore it or take a course of...

    Started by ihf‎, 03-13-2017 09:44 AM
    • Replies: 14
    • Views: 307
    03-13-2017, 06:02 PM Go to last post
  5. Post conditional probability

    Hello, I have a list of products and for each product corresponds an RCA index as shown in the attached table. I would like to calculate for both...

    Started by gammoudi‎, 03-09-2017 08:41 AM
    • Replies: 3
    • Views: 312
    03-09-2017, 03:09 PM Go to last post
  6. Confidence levels

    Hi, I need to calculate the confidence levels that I have enough staff at any point in time to service up to 6 tills in a supermarket. I have a...

    Started by Pigmy‎, 03-07-2017 01:23 PM
    • Replies: 3
    • Views: 254
    03-07-2017, 09:33 PM Go to last post
  7. CDF of a PDF with a negative power

    I need to solve the following problem: For a marine hull insurance policy, a claim occurs with probability 0.DD, where DD represents the two...

    Started by endlessend25‎, 03-03-2017 11:19 AM
    density function, self-study
    • Replies: 3
    • Views: 349
    03-03-2017, 11:06 PM Go to last post
  8. I need help with a difficult problem

    Here's the problem: Each trial can have 3 outcomes with different chances of each, let's say P(A) = .2, P(B) = .15, and P(C) = .65. I want to find...

    Started by Lazaeus‎, 03-03-2017 12:59 PM
    • Replies: 1
    • Views: 233
    03-03-2017, 04:02 PM Go to last post
  9. Exclamation Probability of an Event...in a certain Time!

    Hi Guys, This is probably a basic question for you lot...but let's say I had calculated the chance of an event happening (in this case lets say a...

    Started by SMITH1988CJ‎, 02-28-2017 04:25 PM
    • Replies: 4
    • Views: 309
    03-02-2017, 04:06 PM Go to last post
  10. bayes for generating new data

    I am estimating a tree inventory for a city. I have already measured the heights and identified the species for about 1000 trees in some areas of...

    Started by andyspeak‎, 03-01-2017 08:25 AM
    bayes, generate data, spatial statistics
    • Replies: 3
    • Views: 266
    03-02-2017, 03:20 AM Go to last post
  11. 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 10:08 AM
    • Replies: 7
    • Views: 469
    03-02-2017, 03:06 AM Go to last post
  12. Exclamation Probability of developing a lung cancer disease

    I need to solve this problem: A cohort study is done to assess the impact of smoking on lung cancer. In this study, a large representative sample...

    Started by aptremblay‎, 03-01-2017 02:46 PM
    probability, probability homework help, statistics, statistics problems
    • Replies: 5
    • Views: 234
    03-01-2017, 05:30 PM Go to last post
  13. 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 10:39 AM
    chebychev's inequality, probability density
    • Replies: 1
    • Views: 380
    02-23-2017, 05:05 PM Go to last post
  14. 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 07:58 AM
    • Replies: 10
    • Views: 489
    02-23-2017, 02:33 PM Go to last post
  15. 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 04:35 PM
    • Replies: 4
    • Views: 387
    02-23-2017, 12:00 AM Go to last post
  16. 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 02:29 PM
    • Replies: 5
    • Views: 255
    02-21-2017, 01:47 AM Go to last post
  17. 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 04:03 AM
    dice, probability
    • Replies: 1
    • Views: 223
    02-20-2017, 10:03 PM Go to last post
  18. 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 04:59 PM
    probabilities, probability distributions, probability function, queuing, queuing theory
    • Replies: 1
    • Views: 301
    02-18-2017, 07:54 PM Go to last post
  19. 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 07:58 AM
    lean six sigma, probability
    • Replies: 1
    • Views: 261
    02-17-2017, 02:41 PM Go to last post
  20. 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 07:30 PM
    • Replies: 1
    • Views: 279
    02-16-2017, 06:25 PM Go to last post
  21. 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 08:00 PM
    • Replies: 1
    • Views: 327
    02-15-2017, 10:08 PM Go to last post
  22. 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 10:02 AM
    mgf, sample mean
    • Replies: 5
    • Views: 520
    02-14-2017, 07:26 PM Go to last post
  23. 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 06:27 AM
    • Replies: 0
    • Views: 306
    02-13-2017, 06:27 AM Go to last post
  24. probability


    Started by asonibareoyindamola‎, 02-10-2017 06:49 PM
    • Replies: 1
    • Views: 380
    02-10-2017, 07:03 PM Go to last post
  25. 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 05:27 PM
    • Replies: 3
    • Views: 311
    02-10-2017, 07:02 PM Go to last post
  26. 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 04:43 AM
    probability mass function
    • Replies: 0
    • Views: 223
    02-09-2017, 04:43 AM Go to last post
  27. 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 04:47 PM
    2 Pages
    1 2
    • Replies: 22
    • Views: 730
    02-08-2017, 09:28 PM Go to last post
  28. 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 08:33 PM
    • Replies: 0
    • Views: 158
    02-08-2017, 08:33 PM Go to last post
  29. Question Probability problem help

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

    Started by zupanii‎, 02-05-2017 11:31 AM
    • Replies: 1
    • Views: 280
    02-05-2017, 11:59 AM Go to last post
  30. 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 09:05 PM
    additivity, axiom, measure
    • Replies: 6
    • Views: 617
    02-03-2017, 03:06 PM Go to last post
  31. 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 11:01 AM
    • Replies: 5
    • Views: 476
    02-02-2017, 10:48 AM Go to last post
  32. 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 06:10 AM
    • Replies: 3
    • Views: 411
    02-02-2017, 12:52 AM Go to last post
  33. 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 12:34 PM
    probability estimate, probability question
    • Replies: 0
    • Views: 237
    01-30-2017, 12:34 PM Go to last post
  34. 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 03:38 PM
    • Replies: 1
    • Views: 338
    01-29-2017, 08:55 PM Go to last post
  35. 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 07:56 PM
    • Replies: 0
    • Views: 272
    01-29-2017, 07:56 PM Go to last post
  36. 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 05:32 PM
    • Replies: 0
    • Views: 276
    01-29-2017, 05:32 PM Go to last post
  37. 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 03:34 PM
    • Replies: 0
    • Views: 270
    01-29-2017, 03:34 PM Go to last post
  38. 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, 01-28-2017 11:00 PM
    • Replies: 0
    • Views: 269
    01-28-2017, 11:00 PM Go to last post
  39. 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 02:25 PM
    • Replies: 2
    • Views: 433
    01-26-2017, 07:41 PM Go to last post
  40. 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 05:55 AM
    excel, probability
    • Replies: 1
    • Views: 421
    01-26-2017, 07:22 PM Go to last post
  41. 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, 01-24-2017 11:10 PM
    • Replies: 4
    • Views: 491
    01-25-2017, 08:31 PM Go to last post
  42. 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 09:41 PM
    conditional probability
    • Replies: 3
    • Views: 635
    01-22-2017, 01:49 PM Go to last post
  43. 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 09:23 PM
    • Replies: 0
    • Views: 408
    01-21-2017, 09:23 PM Go to last post
  44. 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 09:24 PM
    combination, combinatorics, permutation, probability
    • Replies: 0
    • Views: 372
    01-19-2017, 09:24 PM Go to last post
  45. 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 08:00 AM
    bayes, bayesian inference, probability
    • Replies: 5
    • Views: 576
    01-18-2017, 12:56 PM Go to last post
  46. 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 02:08 PM
    • Replies: 8
    • Views: 828
    01-17-2017, 10:45 AM Go to last post
  47. 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 04:37 AM
    arrival time, exponential distribution
    • Replies: 0
    • Views: 416
    01-17-2017, 04:37 AM Go to last post
  48. 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 12:20 PM
    • Replies: 2
    • Views: 567
    01-16-2017, 05:35 PM Go to last post
  49. 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 12:39 PM
    • Replies: 0
    • Views: 500
    01-13-2017, 12:39 PM Go to last post
  50. 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 05:19 AM
    • Replies: 3
    • Views: 687
    01-13-2017, 04:25 AM Go to last post
  51. 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 06:43 PM
    • Replies: 1
    • Views: 626
    01-09-2017, 07:22 PM Go to last post
  52. 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 08:22 AM
    exponential distribution, maximum likelihood
    • Replies: 0
    • Views: 566
    01-07-2017, 08:22 AM Go to last post
  53. 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 07:40 PM
    • Replies: 0
    • Views: 553
    01-06-2017, 07:40 PM Go to last post
  54. Exclamation Teaching chi² distribution

    Hello, I would like to explain to students the chi²-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 03:48 AM
    • Replies: 1
    • Views: 813
    01-02-2017, 05:53 PM Go to last post
  55. 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 08:42 AM
    • Replies: 1
    • Views: 656
    12-31-2016, 10:09 AM Go to last post
  56. 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 08:29 AM
    probability, statisics
    • Replies: 1
    • Views: 648
    12-31-2016, 08:36 AM Go to last post
  57. 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 02:51 AM
    • Replies: 2
    • Views: 664
    12-28-2016, 07:40 AM Go to last post
  58. 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 11:18 AM
    • Replies: 0
    • Views: 592
    12-27-2016, 11:18 AM Go to last post
  59. 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 06:58 PM
    • Replies: 0
    • Views: 762
    12-21-2016, 06:58 PM Go to last post
  60. 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 05:11 AM
    • Replies: 0
    • Views: 587
    12-20-2016, 05:11 AM Go to last post

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