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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: 31,159
09-30-2005, 09:44 AM
1. ### 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: 1,357
04-28-2017, 06:10 PM
2. ### 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: 1,545
04-27-2017, 05:38 PM
3. ### Time Series Analysis

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

• Replies: 7
• Views: 7,666
04-18-2017, 03:10 PM
4. ### 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: 1,490
04-18-2017, 02:38 PM
5. ### [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: 1,277
04-18-2017, 09:18 AM
6. ### 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: 936
04-16-2017, 05:23 PM
7. ### 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: 2,464
03-30-2017, 04:11 PM
8. ### 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: 1,585
03-30-2017, 03:42 PM
9. ### 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: 1,346
03-30-2017, 02:06 PM
10. ### 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: 1,190
03-30-2017, 11:58 AM
11. ### 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: 1,442
03-29-2017, 06:59 AM
12. ### 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: 1,641
03-23-2017, 10:38 AM
13. ### 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: 2,142
03-18-2017, 06:05 PM
14. ### 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: 2,060
03-13-2017, 06:02 PM
15. ### 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: 2,183
03-07-2017, 10:33 PM
16. ### 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: 2,706
03-04-2017, 12:06 AM
17. ### 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: 2,209
03-02-2017, 05:06 PM
18. ### 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: 2,484
03-02-2017, 04:20 AM
19. ### 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: 2,859
03-02-2017, 04:06 AM
20. ### 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: 2,428
03-01-2017, 06:30 PM
21. ### 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: 2,163
02-23-2017, 06:05 PM
22. ### 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: 2,957
02-23-2017, 03:33 PM
23. ### 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: 2,288
02-23-2017, 01:00 AM
24. ### 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: 1,480
02-20-2017, 11:03 PM
25. ### 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: 1,923
02-18-2017, 08:54 PM
26. ### 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: 1,739
02-17-2017, 03:41 PM
27. ### 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: 3,088
02-14-2017, 08:26 PM
28. ### 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: 2,125
02-13-2017, 07:27 AM
29. ### probability

probability

• Replies: 1
• Views: 2,113
02-10-2017, 08:03 PM
30. ### 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: 2,233
02-10-2017, 08:02 PM
31. ### 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: 1,998
02-09-2017, 05:43 AM
32. ### 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: 4,387
02-08-2017, 10:28 PM
33. ### Probability problem help

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

• Replies: 1
• Views: 2,122
02-05-2017, 12:59 PM
34. ### 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: 4,997
02-03-2017, 04:06 PM
35. ### 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: 2,038
02-02-2017, 01:52 AM
36. ### 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: 2,311
01-30-2017, 01:34 PM
37. ### 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: 2,047
01-29-2017, 09:55 PM
38. ### 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: 1,834
01-29-2017, 08:56 PM
39. ### 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: 1,933
01-29-2017, 06:32 PM
40. ### 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: 1,776
01-29-2017, 04:34 PM
41. ### 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: 4,294
Mij
01-29-2017, 12:00 AM
42. ### 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: 2,438
01-26-2017, 08:41 PM
43. ### 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: 2,573
01-26-2017, 08:22 PM
44. ### 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: 4,788
01-25-2017, 09:31 PM
45. ### 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...

• Replies: 3
• Views: 3,418
01-22-2017, 02:49 PM
46. ### 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...

• Replies: 0
• Views: 1,903
01-21-2017, 10:23 PM
47. ### 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...

• Replies: 0
• Views: 1,731
01-19-2017, 10:24 PM
48. ### 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...

• Replies: 5
• Views: 3,443
01-18-2017, 01:56 PM

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