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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: 31,052
09-30-2005, 09:44 AM
1. ### counting problem?

A closet contains 6 diﬀerent pairs of shoes. Five shoes are drawn at random. What is the probability that at least one pair of shoes is obtained?

• Replies: 2
• Views: 1,312
11-11-2013, 05:48 PM
2. ### probability problem that's been messing with my head. Please at least look at it

I'm taking a liberal arts math at my college and the teacher gave us a take home test. There is one probability problem that's just not clicking....

• Replies: 2
• Views: 2,531
11-09-2013, 06:17 PM
3. ### Help on confidence interval

A random sample of 35 undergraduates from Spring 2013 had a mean grade on these small point value assignments of 69.49 and a standard deviation of...

• Replies: 0
• Views: 1,176
11-09-2013, 12:34 AM
4. ### Probability of Being Displaced

Hi all, I'm trying to work out the probability of an animal being displaced from a resource at different life stages. For example there are five...

• Replies: 0
• Views: 1,192
11-08-2013, 06:52 AM
5. ### Probability with replacement

Hello, I have the following question which I'm really struggling with. The data come from the records of an estate agent and relate to sales of...

• Replies: 3
• Views: 3,730
11-07-2013, 02:21 PM

We are going to start a Plinko Poker Promotion at my local card room and the board is set up as follows: 9 spots at the bottom, 1 ace, 2 kings, 2...

• Replies: 0
• Views: 1,642
11-05-2013, 11:07 PM
7. ### Consistent estimator proof. plz help me out in this proof?

I dont know how to prove this one: Let h(x) ia an even function, nondecreasing and non negative for x. Then, E goes to zero, for all θ implies that...

• Replies: 3
• Views: 2,197
11-05-2013, 01:10 PM
8. ### Probability of Yahtzee game

Hi, i am new to this forum. Sorry if i post in wrong place. Have anyone played Yahtzee game? It's a popular game with 5 dice and you can roll up...

• Replies: 3
• Views: 2,066
11-03-2013, 09:59 PM
9. ### Probabilty of picking a card in a deck

I've never been very good in probability but I want to know how to calculate this. This is not a homework assignment or anything I am just curious....

• Replies: 6
• Views: 1,973
BGM
11-03-2013, 07:37 AM
10. ### Comparing and balancing two outcome-production methods

Hi, I've a question. :) I have a soccer videogame where teams have different strengths (16 to 621). The result of a match between two teams can be...

• Replies: 1
• Views: 1,670
11-03-2013, 04:06 AM
11. ### Amateur has a question please

My wife and I have been married for 30 years. During all this time neither my wife, nor her father (my father-in-law), have had an auto accident. We...

• Replies: 5
• Views: 1,998
11-02-2013, 08:54 PM
12. ### Geometric Distribution problem

Hi, I have a quick question: 1. I have a universe that has 40% of it with a condition Z (Success). 2. Of those 40%, 15% of them have condition...

• Replies: 0
• Views: 1,138
10-31-2013, 10:14 PM
13. ### Error bars for unknown distribution

I recently made a graph where I show the error bars for a certain number of "experiment". In another way, in my algorithm I'm minimizing the...

• Replies: 0
• Views: 1,289
10-30-2013, 03:35 AM
14. ### Looking for terms/formuals to use.

I am seeking a way to express a problem (and know very little). I have a 60 card deck (MTG) that can contain up to 4 of the same cards. What is...

• Replies: 1
• Views: 1,971
10-29-2013, 07:51 PM
15. ### Who can solve this probability problem?

Hi all, We have a population of people (denoted by S=30000). Assume that we want to divide this population into groups (denoted by D) consisting...

• Replies: 0
• Views: 1,363
10-29-2013, 04:26 PM
16. ### cross term

The book says that the following cross term can be shown to be zero by iterating the expectation: E. What does it mean "to iterate the...

• Replies: 1
• Views: 1,092
10-28-2013, 09:52 AM
17. ### Poisson Distribution Question: Probability, Mean and Variance

Just Slow Down is a public awareness campaign in Winnipeg to help drivers understand the relationship of excessive speed to traffic collisions,...

• Replies: 7
• Views: 2,540
10-27-2013, 10:37 PM
18. ### Poisson question

Can anyone shed some light on this one? When cycling home at night, I notice that sometimes my rear light is switched oﬀ when I arrive home....

• Replies: 1
• Views: 5,023
10-27-2013, 07:25 PM
19. ### Random variables and probability distributions

The question i need help to is below: Laboratory tests on a large shipment of radios revealed that 6.5% are defective. On arrival of the...

• Replies: 1
• Views: 1,774
10-27-2013, 07:13 PM

Hello! Please help me! I have data set like following table: group x1 x2 ... xn 0 * * ... * 0 * * ... * 1 * ...

• Replies: 0
• Views: 1,233
10-27-2013, 05:27 PM
21. ### Possible Outcomes and their Corresponding Probabilities

I have this question here that is confusing me a lot. I think it may be the wording. But here it is: Inability to get along with others is the...

• Replies: 4
• Views: 2,141
10-27-2013, 04:47 PM
22. ### Compuite P{X < Y} conditioned on the value of Y; intuition behind it.

Dear people, I have a question concerning the following steps to compute P{X < Y}. The steps shown are the following: P{X < Y} = \int P(X <...

• Replies: 1
• Views: 1,540
BGM
10-27-2013, 07:54 AM
23. ### Probability Question (Ambiguous)

SOLVED BY MYSELF, YOU CAN CLOSE THE THREAD :) Hi guys, I'm new to this forum, and some of you might find it annoying that I post a question...

• Replies: 1
• Views: 1,555
10-24-2013, 05:02 PM
24. ### MLE of a weirdly split lambda in a Poisson distribution

Hi everyone! :) I'm new here. I have been looking everywhere for the solution to this problem so here's to hoping some of you can help me. :) ...

• Replies: 6
• Views: 2,791
10-24-2013, 06:39 AM
25. ### Finding probability of unknown distribution

The problem states: Given the following soil water content data and making no distributional assumptions, what is the probability that the next...

• Replies: 1
• Views: 1,560
10-23-2013, 02:25 PM
26. ### Calculating probability that a business will find a buyer and sell

Bare with me whilst I try and explain this one. I work for a business that finds companies to buy a client business that's signed up with us. I have...

• Replies: 0
• Views: 1,160
10-23-2013, 02:56 AM
27. ### Need help with basic probability scenario (not hw)

Rephrasing the scenario into a word problem for the sake of simplicity. I hope it doesn't get convoluted, but then again explaining the actual...

• Replies: 9
• Views: 1,904
10-23-2013, 01:12 AM
28. ### string counting problem

We consider permutations of the string ”ABACADAFAG”. How many permutations are there? How many of them don’t have any A next to other A? How many...

• Replies: 0
• Views: 1,402
10-22-2013, 06:15 PM
29. ### conditional probability

The table below displays data the First Bank of Silverhaven (FBS) has collected on the personal savings accounts of its job-holding customers. The...

• Replies: 3
• Views: 11,200
10-22-2013, 12:40 PM
30. ### NEED HELP URGENT! Probability Question

How can we arrange 10 boys and 15 girls in such way that no two boys are adjacent to each other? Please help math geniuses.

• Replies: 4
• Views: 1,785
10-22-2013, 11:29 AM

"The weekly earnings of fastfood restaurant employees are normally distributed with a mean of $395. If only 1.1% of the employees have a weekly... • Replies: 4 • Views: 3,635 10-22-2013, 09:58 AM 32. ### proportion of a sample Hi. Could someone help me answer the last 3 blank boxes? I got 0.2, 0.05 and sqrt(0.2*0.8/150) for the first 3 boxes. A researcher in Food... • Replies: 0 • Views: 1,477 10-21-2013, 06:44 PM 33. ### Probability Question related to GMAT There are a total of 60 white and red balls in the box. A ball in picked randomly. If the probability of picking a white ball is 2/5. How many red... • Replies: 1 • Views: 1,261 10-21-2013, 05:56 PM 34. ### Groups of dice probability I am new to Statistics and this was a homework that was given to us. I was able to come up with the answer during the class last week, but my... • Replies: 2 • Views: 1,464 10-21-2013, 01:08 PM 35. ### Probability question An Mechanical part has an average life expectancy of 10,500 hours of operation. A Six Sigma team has incorporated some design changes to improve the... • Replies: 4 • Views: 1,205 10-21-2013, 12:59 PM 36. ### Value that increases the Standard Deviation Hello, I am puzzled by the following statement " In order to increase the standard deviation of a set of numbers, you must add a value that... • Replies: 2 • Views: 1,855 10-20-2013, 05:30 PM 37. ### Probability of deviation in sample proportion Hi! I’m very new to statistics and I’m stuck on what formula to use for an assignment. I have the information that 32.19 % of my population is... • Replies: 5 • Views: 1,916 10-19-2013, 01:49 PM 38. ### Proof the sum of two CDF's is a CDF. This is a question my instructor asked in the last midterm exam but nobody was able to solve and he's suggesting it may come out again in the finals:... • Replies: 4 • Views: 3,300 BGM 10-18-2013, 10:02 PM 39. ### integrating joint probability distribution Hi, could you help me in compute the integral with respect to x of f(x,y)d(x,y) where f(x,y) is a joint probability distribution? I know that the... • Replies: 3 • Views: 1,396 BGM 10-18-2013, 02:52 PM 40. ### Geometrci random walk Hi! I need help! l I need simulate process - geometric random walk for modeling the behavior of the price of a stock over time. state space is... • Replies: 1 • Views: 1,404 BGM 10-18-2013, 12:57 PM 41. ### Probability Help I'm having some trouble trying to figure this out: James is going to write an exam Suppose that if he hadn't passed in previous attempts, each... • Replies: 3 • Views: 2,303 10-18-2013, 01:16 AM 42. ### How to calculate the probability of a node failing in a network Hello all, I am trying to understand networks etc and put some maths in it. Of course, real networks dont have a simple tree structure in order to... • Replies: 0 • Views: 2,296 10-17-2013, 08:01 AM 43. ### I need to work out probability of getting a medical condition Hi folks I need to work out the probability of a medical side effect arising and I am not sure how to do it. Background: I have three known... • Replies: 0 • Views: 1,546 10-16-2013, 07:14 AM 44. ### Variance of two deterministic distributions I would like to know the variance of two deterministic distributions when putting them together. Of course the variance of the two seperate... • Replies: 4 • Views: 3,696 10-15-2013, 01:22 AM 45. ### Investing in funds Hello, maybe someone can help me here? That would be awesome. I have an exam coming up and need to understand this... Linda invests her money in... • Replies: 0 • Views: 3,870 10-14-2013, 01:33 PM 46. ### Dice Roll Game Probabilities Hello everyone, I have a bit of a probability question for you as it has been quite awhile since I have been in school, and I can’t remember the... • Replies: 3 • Views: 2,134 BGM 10-13-2013, 01:36 PM 47. ### Whats its the probability of the mentioned two scenarios ? Hi fellas I am new to this forum . Can you help it with this The Smallville Daily wants the number of pages of its paper that are really... • Replies: 1 • Views: 1,380 10-13-2013, 10:33 AM 48. ### the set of all possible nXn covariance matrices.... ....is infinite countable or uncountable? • Replies: 2 • Views: 1,236 10-12-2013, 08:09 PM 49. ### Linear Probability Model problem (Binary dependent variables) y i =a+bD i +u i ,i=1,…,n (LPM equation) Always thank you for your helps! I have a question about Linear Probability Model. You can see the... • Replies: 0 • Views: 2,231 10-12-2013, 11:34 AM 50. ### mean and variance of a beta distribution I'm trying to do point (b) of exercise 3.30 of the book "Statistical Inference" (Casella & Berger). The exercise says: "Use the identities of... • Replies: 2 • Views: 5,094 10-12-2013, 09:53 AM 51. ### Difference between probability of an individual and of a population? Im a little confused as to finding the probability of an individual to a population. My answers don't look correct. Could anyone help me out? A... • Replies: 1 • Views: 2,281 10-12-2013, 12:27 AM 52. ### Probability The Honolulu Advertiser stated that in Honolulu there was an average of 659 burglaries per 300,000 households in a given year. In the Kohola Drive... • Replies: 1 • Views: 4,210 10-10-2013, 09:27 PM 53. ### Transformations and Distribution Function Hey guys, Consider the following short example of transformations. Let the joint density of x\ \text{and}\ y be given by the unit square, i.e.... • Replies: 2 • Views: 2,146 10-10-2013, 04:34 PM 54. ### The Gamblers Fallacy and Regression to the Mean Hi, so first time posting and all. I'm not a statistician by degree or trade (actually an engineer), so a little confused by something, and was... • Replies: 5 • Views: 9,645 10-10-2013, 02:27 PM 55. ### Distribution of variance Hello, I need help on a particular issue: I have performed a number of replicate experiments to determine the variance of my setup. None of the... • Replies: 1 • Views: 1,585 10-10-2013, 05:12 AM 56. ### Moments of Burr Distribution(tricky) Hi all, consider the following problem: For the Burr Distribution given by: \displaystyle g(y)=\frac{abty^{t-1}}{(1+by^t )^{a+1}}\ \text{for}\... • Replies: 2 • Views: 2,529 10-10-2013, 04:49 AM 57. ### Resultant distribution HI, H is a random variable with distribution of CN(0,1) , and X is (+or-) a with probability of 0.5 each. I need the distribution of HX,... • Replies: 0 • Views: 1,921 10-09-2013, 01:12 AM 58. ### How to find the probability of a podium finish Say in a race there are 22 competitors and say that the probability of driver A of winning the race is 55%. How can one calculate the probability of... • Replies: 5 • Views: 2,381 10-08-2013, 10:57 PM 59. ### Expected Value and Fair Value clarification (work already done) 4. In the lottery game FANTASY 5 you have to select 5 numbers from the numbers {1,2,3,... ,38,39} for a jackpot of$40,000. Each ticket costs \$1. In...

• Replies: 2
• Views: 2,575
10-08-2013, 10:10 PM

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