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# Forum: Probability

Probability course and homework discussion. Probability distributions. Probability theory, stochastic processes

1. ### 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)...

• Replies: 0
• Views: 16,098
09-30-2005, 09:44 AM
1. ### Two dice are thrown simultaneously

Two dice are thrown simultaneously. 1.Find the probability of getting an odd number on the one and a multiple of three on the other. 2.what is the...

• Replies: 2
• Views: 128
Yesterday, 11:19 AM

A group of telephone subscribers is observed continuously during a 80-minute busy hour period. During this time, they make 30 calls, with the total...

• Replies: 1
• Views: 192
06-20-2016, 08:48 AM
3. ### distributing labeled balls in unlabel! Statistics for Biological problem,help needed?

Hello everyone, I am a biology student and i am stuck with a problem, hence here. I have a large number of 10 different kinds of viruses in a tube...

• Replies: 1
• Views: 210
06-20-2016, 03:20 AM
4. ### Binomial distribution and rolling dice

I realized this was the homework forum and reposted it in general discussion since mine is not homework.

• Replies: 0
• Views: 100
06-17-2016, 03:26 PM
5. ### Probability distribution on next draw from random variable

I'm working on a game theory model of incomplete information, where players observe certain attributes via noisy signals. I am looking to solve for...

• Replies: 1
• Views: 52
06-17-2016, 11:55 AM
6. ### Interpreting the limiting distribution of markov chains?

Hi all, I have a few questions on the interpretation and application of the steady state or limiting distribution for a markov chain transition...

• Replies: 0
• Views: 468
06-16-2016, 07:16 PM
7. ### Super Bowl Pool Probability Question

Hey we were trying (and failing) to calculate the odds of winning our super bowl pool at least twice based on the below info: There are 100...

• Replies: 1
• Views: 271
06-16-2016, 01:59 PM
8. ### Obtaining Probability for costs above a certain threshold

Dear all, I never sought for help on a forum since I feel that many times the answer for a problem can be found if one reads books and searches...

• Replies: 4
• Views: 254
06-15-2016, 10:43 AM
9. ### Paper Notes in a Bag

Hello all, I have this problem, which I am not fully sure how to solve: In a bag there are 18 paper notes. On five of them there is the digit...

• Replies: 5
• Views: 171
06-15-2016, 06:47 AM
10. ### Hypergeometric problem

Hello all, I have some problems with this question. Can you assist ? Thanks ! In a cellar there are 3 bottles of wine which are 18 years old, 4...

• Replies: 1
• Views: 137
06-14-2016, 04:12 PM
11. ### Risk Analysis questions

Hi, I'm new on this forum! I have some question about risk analysis, I'm doing some exercices and I don't understand some points. 1) Limit of...

• Replies: 0
• Views: 183
06-10-2016, 03:02 PM
12. ### Exam tomorrow, urgent help needed.

Hello, first, im a bulgarian student, my exam is in bulgarian and i translated it to english via google translate, if its not understandable but you...

• Replies: 1
• Views: 138
06-09-2016, 03:27 PM
13. ### Business Predictability Scheduling Dilemma

Our business is working to change a longstanding practice of publishing fixed Buy Prices on a Quarterly basis. One of the impacts of this standard...

• Replies: 0
• Views: 134
06-08-2016, 09:57 AM
14. ### Help for an exercise please!

Hello! I am very confused about something. I am using a software for the reaction time, I have a distribution, mean and standard deviation. and 2...

• Replies: 4
• Views: 295
06-04-2016, 11:55 PM
15. ### Joint Density Function From Given Correlation

How do I find joint density function from a given correlation?

• Replies: 1
• Views: 154
06-02-2016, 01:14 PM
16. ### Interpretation of likelihood ratio and hypothesis testing

Even after extensive search, am unclear on some (basic) concepts regarding likelihood vs. frequentist approach in hypothesis testing. Can you...

• Replies: 0
• Views: 103
06-02-2016, 03:08 AM
17. ### calculating $E(Y)$

suppose X is random variable non negative with Distribution function F_{X}(x) and Y is random variable with Distribution function...

• Replies: 1
• Views: 160
BGM
05-31-2016, 01:56 PM
18. ### Hypothesis test of sample (yes/no) and proportions

Edit: I'm not sure whether this belongs in statistics or probability forum. Hi guys, I' prepping for exams with old exam questions and I'm...

• Replies: 0
• Views: 128
05-25-2016, 06:06 PM
19. ### Probability problem - no idea where to start

Sorry - my question was poorly written.

• Replies: 0
• Views: 125
05-25-2016, 05:27 PM
20. ### How to calculate probability of two samples

Hello everyone, Just need advice how to calculate probability of two samples in a 2 x 4 table. so say i have two groups (brown haired people...

• Replies: 0
• Views: 136
05-25-2016, 11:25 AM
21. ### Probability problem - descrete Random variable

post deleted...

• Replies: 0
• Views: 108
05-25-2016, 08:32 AM
22. ### Is the order of an event occurs in a sequences of events random?

I am interested in knowing how to analyse whether the order in which an event occurs within a sequence of events is random; i.e. is the likelihood of...

• Replies: 0
• Views: 79
05-25-2016, 06:20 AM
23. ### Easy Coin Flip Problem ???

Hi, I need help. Assume the probability of flipping a coin to heads 20 times in a row is 1:1,000,000 Q: Each day you wake up and flip a coin...

• Replies: 7
• Views: 482
05-18-2016, 01:54 PM
24. ### Roll a Dice (1)

1. Between two games offered to you, would you rather (i) roll a die once and get paid \$1 million for each dot on the upturned face, or (ii) roll a...

• Replies: 1
• Views: 234
05-17-2016, 08:21 PM
25. ### Roll 2 Dice (2)

2. If you roll 2 fair dice and add the points on each of the upturned face, what is the most likely sum? What is the probability of getting this sum?...

• Replies: 0
• Views: 150
05-17-2016, 05:32 PM
26. ### Probability question

A teacher says 40% of students study for a specific test. If she randomly selects 5 students, whats the probability that 3 studends did not study for...

• Replies: 2
• Views: 179
05-17-2016, 08:43 AM
27. ### Differences of proportions

Please forgive what I assume is the simplicity of these related problems, but I don't seem to find the solution elsewhere. 1) 2 cards are...

• Replies: 0
• Views: 129
05-16-2016, 08:52 AM

Hello together, I am a bit lost with this problem that I need to answer for a university project and I hope someone is able to help me solving...

• Replies: 1
• Views: 124
05-15-2016, 03:13 PM
29. ### should bayes therom be used?

Seems like a relatively simple question, but I'm missing it: There are 25 delinquent accounts in 100 accounts. If I choose 75 accounts out of the...

• Replies: 2
• Views: 234
05-15-2016, 06:41 AM
30. ### Conditional probability of functions. Small question

Hey, i was just looking at a question where the question is calculate: P( B(t) =< x| x=B(s) ). That is, calculate the probability that B(t) is less...

• Replies: 0
• Views: 153
05-12-2016, 06:29 AM
31. ### Moments of a random variable involving numerous Binomial Distributions

I am editing my post because it might have been unclear. Suppose X is a random variable involving 4 binomially distributed random variables: X...

• Replies: 6
• Views: 386
05-10-2016, 10:59 AM
32. ### Challenge: Card drawing probability

Hello everybody, This is my first post because this has been in my head and I couldn't hold it any longer! So here it goes: A friend of mine...

• Replies: 4
• Views: 292
05-10-2016, 06:32 AM
33. ### Determine the risk (probability) of meeting forecasted demand

Hi, I'm doing a project for a car company for my final year studying Industrial Engineering. The company forecast demand 4 months ahead but,...

• Replies: 1
• Views: 205
05-08-2016, 02:03 PM
34. ### Bayesian Approach To Combine Multiple Weighted Inputs

I'm beginning to learn about Bayesian theory but I'm stumped on the ideal approach for combining multiple weighted inputs. Here's an example to make...

• Replies: 2
• Views: 236
05-08-2016, 10:59 AM
35. ### logistic regression+test of hypothesis

Hello guys! I need your advice. I have done a logistic regression to estimate a probability of impaiment occurs or not. My indep.variables were...

• Replies: 2
• Views: 180
05-07-2016, 02:21 AM
36. ### Markov limit expectation

I need to find a limit involving a discrete finite state markov chain with absorbing state. It is given that: q(x,c) = r(x) + \beta E_{c'\lvert...

• Replies: 0
• Views: 118
05-06-2016, 10:43 AM
37. ### Number of Positives

Hi, If I have 128 samples and each sample has a 0.25 probability of being positive, what is the probability that I will have at least 24...

• Replies: 1
• Views: 156
05-02-2016, 10:01 PM
38. ### Probability question

I recently stumbled up on this question. Need help in solving this. N balls thrown at N baskets, what is the chance that a random basket will have...

• Replies: 17
• Views: 601
05-02-2016, 06:58 AM
39. ### Dice probability question

What are the odds of rolling 2d6(2 6-sided dice) three times and getting two 3s? How about rolling 4 times; 5 times? I know rolling a 2d6 has a...

• Replies: 1
• Views: 209
04-30-2016, 01:36 PM
40. ### The random variable and Probability. 2 problems

Hi, can anyone help me out with these 2 problems? Sorry for language mistakes, translated from German.

• Replies: 1
• Views: 160
04-30-2016, 11:52 AM
41. ### Probability Of insurance sales

Just a disclaimer I know I am omitting important factors such as competition, earned premium etc etc. I'm just using this exercise so I can start...

• Replies: 7
• Views: 481
04-26-2016, 02:50 PM
42. ### Normal distribution

Hi all, I'm generating a random normal distribution and i don't control the mu and sigma (its a matlab function that i need to use because the...

• Replies: 2
• Views: 201
04-26-2016, 01:31 AM
43. ### Geometric Mean and SD into Normal Curve

Hi I'm working with a data set of historical return on a particular investment. I have 556 consecutive monthly price values, and i used those to...

• Replies: 0
• Views: 137
04-25-2016, 09:38 AM
44. ### Probability of having "Best Qualified" applicants in a subset of the entire pool

Probability of having "Best Qualified" applicants in a subset of the entire pool. I am working on an issue, trying to show whether or not an HR...

• Replies: 0
• Views: 161
04-25-2016, 12:47 AM
45. ### Not understanding the posterior distribution result

So I cam across this question http://pages.pomona.edu/~jsh04747/courses/math152/wu2_f07.pdf I understand majority of it, except the line ξ(θ|x). I...

• Replies: 1
• Views: 211
04-22-2016, 08:56 PM
46. ### a low correlation and a strong significance = can the null hypothesis be rejected?

I have found that there is a very low negative correlation (r= - 0.17) with strong significance (p<0.0001) between A test and B test. The null...

• Replies: 7
• Views: 442
04-22-2016, 09:07 AM
47. ### Engineering Failure Analysis

I'm currently writing a report in which I would like to discuss the potential for failure of several pipelines. If the chance of failure per pipeline...

• Replies: 1
• Views: 191
04-20-2016, 02:58 PM
48. ### synthetic data (poisson)

Hello I'm trying to get a grip of generating synthetic data but I'm having some difficulties ? Following Hilbe2010...

• Replies: 0
• Views: 213
04-19-2016, 05:57 AM
49. ### Compound Distribution Hyper-Parameters

Hi, If a compound distribution is made up of a gamma dist with parameters (a,b), and b is gamma-distributed so that its parameters are (c,d), such...

• Replies: 1
• Views: 250
BGM
04-18-2016, 01:57 AM
50. ### Sampling with replacement - probability problem

Hi all, (this is my first post, hopefully I am not breaking any rules). I have the following problem that I cannot solve: I have a set of...

• Replies: 6
• Views: 388
04-17-2016, 03:02 PM
51. ### Express similarity measure in terms of probability

Hi, I have an image called 'source.png'. And a set (lets call it set-1) of images called 'target-i.png' (where i:1-10). I need to find which of...

• Replies: 0
• Views: 233
04-15-2016, 05:58 PM
52. ### conditional probability question

I'm having trouble with the following problem: I want to know P(X>C | W>C) with C a known fixed constant, X and W both normally distributed...

• Replies: 0
• Views: 158
04-15-2016, 10:28 AM
53. ### Advantages of having population-defined parameters?

Hello peeps. Quick “conceptual”/weird question. While finishing-up my next manuscript, I started thinking that a way to “buff it up” would be to talk...

• Replies: 1
• Views: 213
04-14-2016, 06:06 PM
54. ### Probability of getting a certain card game hand combo

Trying to figure out the chance of getting a certain combination of cards in a card game. This is related to Magic: The Gathering if that matters. ...

• Replies: 0
• Views: 193
04-13-2016, 11:31 PM

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