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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: 30,374
09-30-2005, 09:44 AM
1. ### Need some help understanding probability theory.

Hello, My probability course has just started and I have a little trouble in preparation for my first quiz tomorrow, understanding some concepts....

• Replies: 5
• Views: 4,939
09-19-2010, 10:02 PM
2. ### What is "countability" mean exactly.

Hi, If a question said, S is uncountable, does that mean it is infinite? my professor said that: a set is countable if it can be put into a one...

• Replies: 2
• Views: 3,995
09-27-2010, 01:05 AM
3. ### Cumulative distribution help.

Okay so I've got this question: Let X be a random variable with a cumulative distribution function Fx. Prove that P(x=a) = 0 if and only if Fx is...

• Replies: 11
• Views: 6,010
10-11-2010, 06:25 PM
4. ### Help with an expectation.

How do i determine: E(Y'Xb|X). I think this is the estimated variance covariance matrix but I'm not sure.

• Replies: 3
• Views: 2,953
BGM
11-06-2011, 03:10 PM
5. ### Expectation of random vectors.

Hi there. I'm trying to prove: Cov(X,Y) = E(XY') - E(X)(E(Y))' So i know the cov of 2 random vectors is written by Cov(X,Y) = E can...

• Replies: 9
• Views: 5,029
11-06-2011, 03:27 PM
6. ### Help with a proof

If x1...xk are random variables defined on a set omega, and B1...Bk C R^1, then prove that (x1,....,xk)^-1 (B1x,...,xBk) = x1^-1B1 n x2^-1B2 n ......

• Replies: 2
• Views: 2,322
c2q
02-04-2012, 03:41 PM
7. ### Proving some axioms about sigma algebra.

I have the following to prove: Given a sigma field/sigma algebra B on a set S. Prove: i) 0 E B ii) if B1,..,Bk E B then UBi E B for i = 1 to n...

• Replies: 9
• Views: 7,656
02-05-2012, 10:32 PM
8. ### Proof of covariance of a weak stationary stoch. process.

Hey there. I'm having trouble on how to show this is true. Assuming you have a weakly stationary independent increments stochastic process with ...

• Replies: 15
• Views: 6,818
c2q
02-05-2012, 04:22 PM
9. ### Gaussian process proof.

I want to prove that the brownian bridge is a gaussian process. Before I start I just wanted to make sure of something. In my notes my...

• Replies: 0
• Views: 2,956
c2q
02-05-2012, 04:29 PM
10. ### Probability Distributions

Hi all, I've got a question here, and i'm not sure if it's how it's written or what, but I'm not quite getting it. Consider an insurance policy...

• Replies: 1
• Views: 4,586
11-12-2009, 08:11 PM

I'm having problems mostly with part (b) and (c). Please add every single step and side note you can - including formulas used. I greatly appreciate...

• Replies: 6
• Views: 2,893
04-28-2013, 02:30 PM
12. ### Convolution and conditionning: S=X+Y X=two point distribution Y=Normal

Hello, can anyone help to find the conditional distribution of X given S if S=X+Y X is a r.v. {0,1} 0 with probability p and 1 with probability...

• Replies: 1
• Views: 3,041
BGM
08-22-2011, 10:46 AM
13. ### Factorials

How would I solve this problem? If I roll a fair die 4 times. X is the number of times 1 or 2 are observed in 4 rolls. What is the minimum number...

• Replies: 6
• Views: 2,034
10-23-2011, 08:33 PM
14. ### Bivariate Normal + Max Transformation

Hi guys, This exercise is driving me crazy. That is: (X,Y) follows a normal bivariate distribution E = E = 0 E = E = 1 E = r I have to...

• Replies: 3
• Views: 4,096
02-02-2011, 05:25 PM

Hi, I have a probability question for my Uni Stats course, and I'm having a bit of trouble figuring out what to do. If someone could help, that...

• Replies: 0
• Views: 1,885
01-10-2010, 06:32 PM
16. ### confidence interval

Hi every one I have problem with this question . please help me if you can A research collected 17 observations of breakdown voltage with...

• Replies: 2
• Views: 1,683
12-30-2012, 05:40 AM
17. ### help?

11.32: To estimate the mean height u(mew) of male students on your campus, you will measure an SRS of students. You know from gov't data that the...

• Replies: 2
• Views: 6,522
02-09-2009, 04:08 PM
18. ### Quetion Reffering to your keno probabilities

Hello, I was googling about Keno probabilities and came across a thread in your forum about probability of hitting 5 numbers out of 80 with a draw...

• Replies: 0
• Views: 3,152
08-03-2007, 11:06 PM
19. ### Profit and Probability

Given a game with a probability of 1/x and a payout of y:1 where y=x/2 and a number of players n, where n>x and n%x=0. Build a distribution of...

• Replies: 3
• Views: 4,414
BGM
08-25-2010, 10:22 AM
20. ### 3D Random Walk

Okay, so I've got this random walk problem here: (a) Using an appropriate Dirac-delta function, find the probability density w(s) for...

• Replies: 1
• Views: 4,631
04-12-2008, 11:32 PM
21. ### Probability of 11 points first in a game? ** Simple **

Hi all, I am a newbie here and has some simple probability, just would like to gauge how far i am... A match can be won with two ways: (1)...

• Replies: 0
• Views: 1,341
05-16-2014, 12:31 PM
22. ### Simple Probability

Years since I have done stats, just want to check I have done this correct: If amazon use 3 companies to deliver parcels, Royal Mail, City Link,...

• Replies: 2
• Views: 1,307
02-01-2015, 01:59 PM
23. ### 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: 3,715
10-14-2013, 01:33 PM
24. ### Simple but convoluted probability help

For my assignment, I'm working on producing a predictive model of probability based on "historic performance", for want of a better description. I...

• Replies: 3
• Views: 1,711
11-27-2012, 10:10 AM
25. ### P. distribution for Finan. Mkts

Dear All, 1st of all, thanks for making this forum so interesting. I'm trying to find a prob. distrib. for financial mkts (like the stock...

• Replies: 4
• Views: 3,825
12-06-2010, 04:41 PM
26. ### Binomial distribution problem.

I think this is a binomial distribution problem but I just don't know how to solve it. It gets a bit hard when I have to decide which is x, n or p ...

• Replies: 1
• Views: 2,759
BGM
03-31-2014, 11:54 AM
27. ### Continuous probabibility distribution.

Please help me with this problem, I don't understand it pretty well. The management of bidding of a company understands that the low bid X in...

• Replies: 0
• Views: 938
04-15-2014, 01:25 AM
28. ### product of N normal distributions

We are given N normal functions, with means \mu_i, and variances \sigma_i^2, i in 1...N. I need to find a formula for the product of the N...

• Replies: 2
• Views: 5,010
08-26-2011, 05:06 PM
29. ### Pr (10 and a heart) - Am I overthinking this?

Hi guys, This may be way simplistic for this forum, so I apologise in advance. Drawing two cards from a standard 52 card deck. What is the...

• Replies: 3
• Views: 1,801
11-26-2013, 09:43 PM
30. ### Roulette Question

I am really stuggling with this....please help The game of American Roulette is played on a whele which consists of 38 slots, each with its...

• Replies: 4
• Views: 3,167
01-17-2007, 12:39 PM
31. ### Normal Curve

Calculate the standard score of the given X value, X=61.6 where mu=66.7 and standard deviation is 65.2 I got a negative score of .078, that can't...

• Replies: 1
• Views: 4,254
01-19-2007, 10:08 PM
32. ### normal distribution help

Hi everyone, The question is: The time at which the pizza gets delivered follows a normal distribution with a mean of 3:00PM and a standard...

• Replies: 6
• Views: 2,118
08-25-2009, 06:42 AM

Question: The income of junior executives in a large corporation are normally distributed with a standard deviation of $2000. A cutback is pending,... • Replies: 4 • Views: 2,804 08-25-2009, 01:38 PM 34. ### Need some guidance!!! I just need my work verified for the problem below. Any help/guidance is much appreciated. A faculty member can be either an assistant professor,... • Replies: 0 • Views: 3,632 03-16-2010, 12:08 PM 35. ### Parametric Test on Ordinal Data Hi to everybody, can I used a parametric test to compare, for example, two independent samples when these samples contain ordinal data and are... • Replies: 0 • Views: 3,224 11-12-2008, 11:17 AM 36. ### problem with all laws... I have to pass a test on-line, but I really don't get it. I need to pass it at least 3 times without mistakes (knowing it does change every time i... • Replies: 3 • Views: 4,763 11-22-2005, 03:47 PM 37. ### Noob question about "combined" probabilities. Hello! Sorry for my poor english, I´m from Argentina. And sorry too if I´m in the wrong place. I need some knowledged about stats and this forum... • Replies: 10 • Views: 1,756 08-04-2015, 09:16 AM 38. ### probability of winning with every failed attempt Hello, I am trying to figure out what the probability of "losing" on a task is after every failed attempt, where each time there is no evidence of... • Replies: 14 • Views: 2,876 BGM 11-01-2011, 01:36 PM 39. ### CDF question It is proposed to model the annual salaries X (in$) paid to people in a particular occupation using the continuous cumulative distribution function:...

• Replies: 2
• Views: 2,107
11-06-2006, 05:49 PM
40. ### first timer

hi guys, this is my first post here...i decided to come here cos i really am stuck with a bunch of question in an assignment for probabilities that i...

• Replies: 1
• Views: 3,004
04-19-2006, 09:50 AM
41. ### how to compare different normal distributions: chance of winning in a popular game

A, B, C, and D play a game, in which scores follow a normal distribution A's mean score is 34 (sd 3), B mean 33 (sd 3.5), C mean 32 (sd 4), D mean...

• Replies: 9
• Views: 2,175
11-22-2012, 05:09 PM
42. ### Basic Probability Question

I have a question regarding basic proability. In the problem outlined below I am worried that I have calculated incorrectly. More specifically, I...

• Replies: 2
• Views: 4,718
10-22-2006, 02:53 PM
43. ### Time Independent Poisson Regression

Hi there, I'm new to all this and am looking for an explanation in Layman's Terms Level 1 (level 1 being your average primate.....level 10 being a...

• Replies: 5
• Views: 4,658
11-03-2012, 02:30 PM
44. ### I need help please!!!

A mail order company receives an average of five orders per 500 solicitations. If it sends out 100 advertisements, find the probability of receiving...

• Replies: 4
• Views: 9,999
10-09-2005, 08:51 PM
45. ### Births

Assume that male and female births are equally likely and that the birth of any child does not affect the probability of the gender of an other...

• Replies: 1
• Views: 15,885
10-09-2005, 09:22 PM
46. ### Poison or not Poison, that is the question.... (Shakespeare?)

Hello, We are investigating vehicle delivery data - which we know if it was pretty random, the arrival intervals of the vehicles will follow a...

• Replies: 1
• Views: 2,510
01-26-2012, 10:41 AM
47. ### A problem using Bayes Inference

This is our Master Qualify Exam problem, please help! Thanks! In a large national park, the number of raccoons in a randomly-picked acre is a...

• Replies: 1
• Views: 2,515
BGM
11-14-2011, 12:27 AM
48. ### Statistics noob here, in need of help!

I am doing my first stats assignment of the term and there is a question on which I need help. 1. 72% of students have text books. Among the...

• Replies: 2
• Views: 2,319
06-11-2008, 11:37 AM
49. ### Real life example for pairwise independent mutually dependent RVs

Three or more pairwise independent variables may be mutually dependent. There are several mathematical examples like Bernsteins Paradox. I am...

• Replies: 0
• Views: 2,416
06-13-2013, 02:19 PM

What statisics to I need to use work out the probability of seeing a dolphin given that it has been seen before? i.e. If it was seen once, will it...

• Replies: 1
• Views: 2,509
03-28-2010, 06:25 PM
51. ### a defective probability problem

I am trying real hard on solving this problem: A sample of 4 different cell phones is randomly selected from a group containing 15 that are...

• Replies: 5
• Views: 3,109
10-28-2008, 08:47 AM
52. ### I have a real world problem and need some guidance in solving it.

Hi, I was hoping someone more knowledgeable than myself might be able to help me out with this. I'd be happy just to be pointed in the right...

• Replies: 0
• Views: 1,759
10-28-2011, 03:08 PM
53. ### Redundancy probability in employment

The idea of being made redundant after working so many years in a company is everyone's nightmare. I am currently working in a company employing...

• Replies: 2
• Views: 1,476
BGM
04-18-2015, 01:40 AM
54. ### SOA Exam-P Practice

Anybody studying for the Society of Actuaries Exam-P? I am studying from the practice questions provided on the website. Any good study materials...

• Replies: 2
• Views: 4,204
12-17-2010, 04:58 PM
55. ### Uniform Dist.

Hey, havin a bit of trouble on this question, not quite sure what to do If X is uniformly dist. over a range of values 8 to 21 pr(X>=7)? Do...

• Replies: 2
• Views: 2,621
05-23-2006, 04:12 AM
56. ### multiple dice rolls where each dice has a different number of sides.

Hi all, :) I would appreciate any and all help given. Abstract of the problem: How can I calculate the probability of any given number turning up...

• Replies: 1
• Views: 3,415
BGM
07-05-2013, 12:14 AM
57. ### Help

When a customer enters a store there are three outcomes that can occur: buy nothing, buy a small amount or buy a large amount. In this situation, if...

• Replies: 1
• Views: 3,381
07-29-2007, 07:20 PM

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