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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: 24,273
09-30-2005, 09:44 AM
1. ### Simple Problem

In a game, you: - Win 70 in scenario 1 - Win 4 in scenario 2 - Lose 20 in scenario3 - Lose 80 in scenario 4 For it to be a fair game, what...

• Replies: 1
• Views: 202
05-20-2017, 04:20 AM
2. ### Distribution of a random sum of random non-iid variables

I'm trying to find the probability distribution of a sum of a random number of variables which aren't identically distributed. Here's an example: ...

• Replies: 1
• Views: 356
05-11-2017, 03:32 AM
3. ### Interpretation of probability density function - uniform distribution

Dear all, I'm having some problems in the interpretation of the probability density function. Until now I thought that f(x) for a continuous...

• Replies: 1
• Views: 240
05-09-2017, 11:34 PM
4. ### Chi² distribution link with standard normal distribution?

Hello, The chi² distribution is the sum of n random standard normal variables. It's used for example to know if a distribution fits the uniform...

• Replies: 4
• Views: 653
04-30-2017, 04:26 AM
5. ### Help please on calculating probabilities of certain coin-flip outcomes

Hi all, (Note: this is not a request for help with "homework"; I'm 51 years old and am trying to learn on my own, through my own "assignments" to...

• Replies: 5
• Views: 403
04-28-2017, 06:10 PM
6. ### Basic Statistics

I am sure this is a basic problem that is easily solvable, however, I have not been in a Statistics class in a little over 31 years and have all but...

• Replies: 4
• Views: 334
04-27-2017, 05:38 PM
7. ### Time Series Analysis

Hello All. I am a new member to this forum. I wish to understand a couple of papers ...

• Replies: 7
• Views: 4,603
04-18-2017, 03:10 PM
8. ### A puzzling problem

Hello all, I am posting here looking for help on solving a probability problem I have been struggling with for 2 days. It has been several years...

• Replies: 3
• Views: 374
04-18-2017, 02:38 PM
9. ### Random Vectors and their inner product.

Let's say i have two random vectors, X and Y, both of length n. The elements of either vector are not independent, and X and Y themselves are not...

• Replies: 0
• Views: 236
04-18-2017, 09:53 AM
10. ### [Discrete Probability Function] P(X²=1)= P(X=1) U P(X=-1)?

I would like to know if this following form of interpretation is correct: ========================== Suppose I have a discrete probability...

• Replies: 1
• Views: 293
04-18-2017, 09:18 AM
11. ### Hypothetical example of using probability to control emotions in business

Imagine a company where there are two principals. The first person is the founder and owner of the company. The second person is nearly a partner...

• Replies: 0
• Views: 224
04-16-2017, 05:23 PM
12. ### Conditional Probability

I have some ambiguity in the following problem Three cards are drawn in succession from a deck without replacement. find the probability...

• Replies: 6
• Views: 926
03-30-2017, 04:11 PM
13. ### Exponential Distribution Conditional Probability

Hello, I have been working with Exponential Distribution problems, but have not come across a problem like this one with both Exponential...

• Replies: 1
• Views: 465
03-30-2017, 03:42 PM
14. ### ordering Probabilty in coin tosses

Hi Guys, First post here so please accept my apologies if this question was posted before. This is baffling me for quite a few days now and I...

• Replies: 4
• Views: 374
03-30-2017, 02:06 PM
15. ### Probability with Permutations Question

Hello! This is my first time posting and I would appreciate any help at all! So the problem I'm working on has to do with randomly choosing letters...

• Replies: 4
• Views: 263
03-30-2017, 11:58 AM
16. ### Conditional Probability

Dear all Please help in solving the following problem. A large industrial firm uses 3 local motels to provide overnight accommodations for its...

• Replies: 1
• Views: 358
03-29-2017, 06:59 AM
17. ### 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...

• Replies: 1
• Views: 488
03-23-2017, 10:38 AM
18. ### 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...

• Replies: 5
• Views: 766
03-18-2017, 06:05 PM
19. ### 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...

• Replies: 14
• Views: 670
03-13-2017, 06:02 PM
20. ### 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...

• Replies: 3
• Views: 720
03-07-2017, 10:33 PM
21. ### 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...

• Replies: 3
• Views: 803
03-04-2017, 12:06 AM
22. ### 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...

• Replies: 4
• Views: 774
03-02-2017, 05:06 PM
23. ### 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...

• Replies: 3
• Views: 714
03-02-2017, 04:20 AM
24. ### 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...

• Replies: 7
• Views: 1,024
03-02-2017, 04:06 AM
25. ### 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...

• Replies: 5
• Views: 608
03-01-2017, 06:30 PM
26. ### 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...

• Replies: 1
• Views: 858
02-23-2017, 06:05 PM
27. ### 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...

• Replies: 10
• Views: 1,009
02-23-2017, 03:33 PM
28. ### 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...

• Replies: 4
• Views: 892
02-23-2017, 01:00 AM
29. ### 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...

• Replies: 1
• Views: 520
02-20-2017, 11:03 PM
30. ### 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...

• Replies: 1
• Views: 779
02-18-2017, 08:54 PM
31. ### 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...

• Replies: 1
• Views: 563
02-17-2017, 03:41 PM
32. ### 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 ...

• Replies: 5
• Views: 996
02-14-2017, 08:26 PM
33. ### 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...

• Replies: 0
• Views: 687
02-13-2017, 07:27 AM
34. ### probability

probability

• Replies: 1
• Views: 774
02-10-2017, 08:03 PM
35. ### 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...

• Replies: 3
• Views: 724
02-10-2017, 08:02 PM
36. ### 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...

• Replies: 0
• Views: 648
02-09-2017, 05:43 AM
37. ### 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...

• Replies: 22
• Views: 1,481
02-08-2017, 10:28 PM
38. ### Probability problem help

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

• Replies: 1
• Views: 716
02-05-2017, 12:59 PM
39. ### 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) +...

• Replies: 6
• Views: 1,748
02-03-2017, 04:06 PM
40. ### 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...

• Replies: 3
• Views: 968
02-02-2017, 01:52 AM
41. ### 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?

• Replies: 0
• Views: 671
01-30-2017, 01:34 PM
42. ### 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...

• Replies: 1
• Views: 868
01-29-2017, 09:55 PM
43. ### 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...

• Replies: 0
• Views: 802
01-29-2017, 08:56 PM
44. ### 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:...

• Replies: 0
• Views: 765
01-29-2017, 06:32 PM
45. ### 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...

• Replies: 0
• Views: 653
01-29-2017, 04:34 PM
46. ### 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...

• Replies: 0
• Views: 692
Mij
01-29-2017, 12:00 AM
47. ### 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...

• Replies: 2
• Views: 1,140
01-26-2017, 08:41 PM
48. ### 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...

• Replies: 1
• Views: 1,151
01-26-2017, 08:22 PM
49. ### 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? ...

• Replies: 4
• Views: 1,967
01-25-2017, 09:31 PM

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