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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: 30,326
09-30-2005, 09:44 AM
1. ### What is meant by mod

X(i,j)=k mod 4, Where (i,j=1,...6) & k=i+j Everything is clear, but what is meant by mod 4 here?

• Replies: 2
• Views: 4,399
09-21-2010, 02:27 AM
2. ### 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: 4,397
BGM
08-25-2010, 10:22 AM
3. ### can you get probability simply from a percentage?

I have this problem I'm trying to figure out regarding discrete probability distributions. If I have a percentage of either successful or failed...

• Replies: 5
• Views: 4,396
02-14-2009, 10:50 PM
4. ### Stats Homework

I am getting ready for my test in a couple of hours actually, but I have a practice test I am attempting now. Their are 2 problems I can't seem to...

• Replies: 1
• Views: 4,393
03-21-2006, 09:01 PM
5. ### PDF problem

Suppose X has uniform distribution on (-1, 1). Find the PDF of Y = X^2. OK, without putting all the details... I got for F(y)...P(-square root...

• Replies: 1
• Views: 4,391
BGM
10-31-2010, 03:42 PM
6. ### sealed bid problem

Your company is making a sealed bid for a construction project. If your firm has the lowest bid, you will pay another firm (a subcontractor) 140...

• Replies: 1
• Views: 4,388
02-26-2008, 05:27 PM
7. ### How to determine data has Poisson Distribution

Hi there Can some one suggest me how i can determine data has poisson distribution? Actually i want to analyze the relationship between these...

• Replies: 0
• Views: 4,388
05-08-2009, 10:52 PM
8. ### Odds question

A newspaper article preceeding the 1994 World Cup semifinal match between Italy and Bulgaria stated that "Itality is favored 10-11 to beat Bulgaria,...

• Replies: 2
• Views: 4,386
02-12-2010, 06:05 PM
9. ### finding MLE

f(x,y)=\frac{\theta}{4}, if (x,y)=(0,0),(1,1) =\frac{2-\theta}{4}, if (x,y)=(0,1),(1,0) Find MLE of \theta where 0\leq\theta\leq 2

• Replies: 8
• Views: 4,384
05-13-2011, 08:05 AM
10. ### Multiple poisson versus one poisson for different arrival types

I am trying to model guest arrivals at a restaurant with exponentially distributed times between arrivals. Arrivals can consist of different party...

• Replies: 1
• Views: 4,381
01-12-2007, 06:47 PM
11. ### need help with set-up

Give the joint density f(x,y)= 60xy^2 if 0<x<y<1 and 0 otherwise, find P(X+Y<1). I just need help setting up the integral...I don't know what to...

• Replies: 1
• Views: 4,375
11-20-2005, 06:31 PM
12. ### Probabilty problem for a Stock Market System

Hi, I have a Probabilty problem for a Stock Market System. Assume I have backtested a system over say 1,000 historical trades. It wins say 40%...

• Replies: 8
• Views: 4,375
01-09-2006, 09:59 AM
13. ### Exponentially Distributed Random Variable

Hey everyone, im having a hard time with this questions, I guess its just not clicking. I was wondering if someone could give me some pointers. ...

• Replies: 1
• Views: 4,372
07-20-2007, 07:11 AM

Hi, Can you please check my answers? Thanks 1) In examining borrower characteristics versus loan delinquency, a bank has collected the following...

• Replies: 0
• Views: 4,372
01-09-2011, 06:27 AM
15. ### Help needed

Hi, not sure how to resolve the following: An airplane as a capacity of 23 passengers. The airline knowning that 10% of passengers who have...

• Replies: 2
• Views: 4,371
10-11-2005, 12:20 PM
16. ### Geometric Distribution question

probability of raining each day = p = 0.01 q = 0.99 What is the expected number of days until we see a rainy day? I think the answer is ...

• Replies: 3
• Views: 4,371
BGM
08-17-2012, 05:31 AM
17. ### two way tables

Maybe there is no way to do this on this format. However, I am a bit stuck on a question about showing proportions on a two way table....probably...

• Replies: 7
• Views: 4,366
11-06-2005, 04:51 PM
18. ### Random Variables and CDF

The problem: A transmission channel is noisy and a binary bit (assume it is a 0 or a 1) has probability of .11 of being incorrectly transmitted. ...

• Replies: 4
• Views: 4,364
02-24-2010, 11:16 AM
19. ### Estimating proportion

A processor of carrots cuts the green top off each carrot, washes the carrots, and inserts six into a package. Twenty packages are inserted in a box...

• Replies: 0
• Views: 4,361
12-02-2009, 09:43 PM
20. ### Calculating Probability of Cyber Attack Data

Folks, need some help, maybe this question is incomplete and needs more data but let me know if thats the case as well: I have a tool that...

• Replies: 0
• Views: 4,360
02-17-2012, 08:42 PM
21. ### Two discrete random variables

Can anyone tell how to find the variance in this problem? The random variables X and Y are normally and independently distributed with means...

• Replies: 10
• Views: 4,356
04-09-2008, 08:23 AM
22. ### mixing distributions

Hi there, Suppose I have the following situation (specifically I simulate the following situation): X follows Exponential(lam1) with...

• Replies: 7
• Views: 4,351
01-19-2009, 05:39 AM
23. ### Normal approximation to the Binomial probability

Having a hard time figuring this out... can someone help me? Suppose that there is a 1 in 10000 (0.0001) chance that a randomly chosen star is...

• Replies: 1
• Views: 4,350
10-23-2009, 01:26 PM
24. ### Urgent help needed :(

Hey guys, its my first time in this forum and I am quite desperate. This task is totally confusing me: It is believed that as many as 25% of...

• Replies: 1
• Views: 4,350
02-28-2010, 06:12 PM
25. ### PDF/CDF of population proportion when sampling without replacement?

Hi Apologies if this is mathematically trivial, but I'm trying to find the probability density function and cumulative distribution function of...

• Replies: 2
• Views: 4,348
06-10-2009, 11:21 AM
26. ### expected value, uniform distribution

Hi everyone, i have a weird question and here it goes, if x is uniformly distributed within the region (0,1]. How should I find E where...

• Replies: 1
• Views: 4,348
07-11-2010, 11:27 AM

a basketball player has a 40% chance of making a 3 point shot. if the player tries n=12 three pintshots, what is the probability that he makes...

• Replies: 1
• Views: 4,344
02-05-2011, 01:59 AM
28. ### Fitting joint distribution to empirical data

I have a dataset of two correlated poisson variables X1 ~ Poisson(my1) X2 ~ Poisson(my2) Pr(X1,X2)<>Pr(X1)*Pr(X2) I would like to specify...

• Replies: 0
• Views: 4,342
10-08-2008, 10:02 AM
29. ### Probability Density function table

given the pdf table for function pxy(x,y) for 2 discrete random variables X and Y which take values 0,1. What do E and Cov(X,Y) equal and what is the...

• Replies: 4
• Views: 4,338
08-24-2011, 09:45 AM
30. ### Show that X+Y has a finite second moment

Prove that if X and Y have finite second moments, then X+Y has a finite second moment. Attempt: (X+Y)^2 ≤ X^2 + Y^2 + 2|XY| => E ≤ E(X^2) +...

• Replies: 3
• Views: 4,335
07-15-2009, 09:00 AM
31. ### help!!!

An investor holds two stocks, each of which can rise (R), remain unchanged (U), or decline (D) on any particular day. Assume that for the first...

• Replies: 3
• Views: 4,333
01-29-2013, 05:58 AM
32. ### In a certain town....

40% of voters favor a given ballot measure. For groups of 22 voters, find the mean and standard deviation for the number who favor the measure.

• Replies: 0
• Views: 4,332
03-19-2006, 10:21 PM
33. ### Exam Review Question: Poisson Probability

I have gone over my exam review and I understand most of the questions on the review, but here is a question I am not sure how to solve. I know the...

• Replies: 0
• Views: 4,331
07-23-2006, 06:56 PM
34. ### 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: 4,331
01-25-2017, 09:31 PM
35. ### Exponential Family

Hi! I'm trying to demonstrate that the following distribution is a member of the exponential family. Theta * x^(Theta-1) * exp (-x^Theta) ...

• Replies: 4
• Views: 4,325
11-04-2011, 08:29 AM
36. ### Good Probability Theory Text Book

Hello, I am wondering if someone, preferably a graduate student, instructor, or professor, could recommend a good textbook about probability. ...

• Replies: 3
• Views: 4,324
05-17-2010, 06:43 PM
37. ### Distribution of xy/z

Hi can someone please help me find the distribution for xy/z where x,y,z are uniform from 0 to 1 and independent. Having trouble with my set up...

• Replies: 4
• Views: 4,321
BGM
01-03-2012, 03:42 AM
38. ### product of sequences converging in probability

Hi, I'm stuck on the following problem: Show that if X_n -> X in probability and Y_n -> Y in probability then (X_n)(Y_n) -> XY in probability. ...

• Replies: 1
• Views: 4,314
mnt
03-22-2010, 10:40 AM
39. ### help with beta distribution

for this question How do i show that X1~Beta(a1,a2+a3) whats a hint to show this?

• Replies: 5
• Views: 4,313
11-02-2010, 06:35 PM
40. ### Expected value of X

R.V. X, given E(x+4)=10 and E=116, determine: Var(X+4); E(X)=mu Var(X)=sigma^2

• Replies: 2
• Views: 4,310
11-22-2006, 05:58 AM
41. ### sampling normal distributions

Hello everyone, I'm a new member to the forum and just wanted to introduce myself. I also have been trying to figure out a homework question, and am...

• Replies: 5
• Views: 4,308
06-20-2008, 12:25 PM
42. ### Need Help With Joint Density Problem Please!

I got the problem

• Replies: 5
• Views: 4,305
11-26-2009, 10:35 AM
43. ### Almost sure convergence

Let Y_n be a simple symmetric random walk on the integers Z, starting in state 0. Define X_n to be 1 if Y_n=0 and 0 otherwise. I have already...

• Replies: 1
• Views: 4,302
11-22-2009, 11:05 AM
44. ### Average probability and empirical probability

This is probably very simple. The problem I have relates to a far more complex calculation, but if I can understand the maths it will be easy enough...

• Replies: 2
• Views: 4,299
09-24-2006, 09:08 PM
45. ### Ratio of uniforms is Cauchy

Hi all! I have U is uniform(0,1) and V is uniform(-1,1) such that U^2 + V^2 <= 1. Furthermore, let X=V/U. Show that X is Cauchy. I tried to...

• Replies: 4
• Views: 4,297
02-17-2010, 02:21 PM
46. ### Another difficult Gaussian integral

Hello all, This time, I'm trying to compute \int^{\infty}_{-\infty} \frac{1}{c} \Phi\left(\frac{x}{a}\right)\phi\left(\frac{x-b}{c}\right) dx ...

• Replies: 3
• Views: 4,296
BGM
04-07-2011, 11:28 AM
47. ### Hypergeometric distribution sample size

Dear all, I have come across a couple of formulae to calculate the sample size (n) needed to detect a given level of prevalence of a condition in...

• Replies: 0
• Views: 4,294
12-03-2008, 06:50 AM
48. ### Probability Question

You randomly pick 10 marbles from a large bag containing 1/6 red marbles. a. What are the chances that you pick exactly 4 red marbles? b. If 10...

• Replies: 9
• Views: 4,293
10-14-2010, 03:10 PM
49. ### Arranging letters

What is the probability that an arrangement of a, b, c, e, f, g begins and ends with a vowel.

• Replies: 1
• Views: 4,291
10-08-2008, 02:13 AM
50. ### help finding the poisson probabilities in this problem

ive got a word problem a need verification and help with the last part with, here it is: the number of flaws on a magnetic VHS tape produced at a...

• Replies: 3
• Views: 4,291
02-06-2009, 07:00 PM
51. ### sum of normal distribution help

X~N(3,5) Y~N(-7,2) What is the distribution of Z=4X-Y/3 ? is it just =- Y/3 + 4X =- Y~N(-7/3,2/3) + X~N(-7/3 + 3,2/3 + 5) = X~N(-7/3 + 3,2/3...

• Replies: 2
• Views: 4,290
11-21-2010, 02:01 PM
52. ### Probability Noob

Hey guys, Im a noob im taking Prob & Stats for Eng. Im only familiar with probability of getting a 4 by rolling a die. Anyway I just wanted to run...

• Replies: 0
• Views: 4,288
09-21-2013, 09:51 PM
53. ### almost sure convergence

Hi, I've got this question I'm trying solve for days already. Let Xn be random variable = 2 with prob 1/3 and = 1/2 with prob 2/3 Let Zn be...

• Replies: 5
• Views: 4,285
BGM
01-13-2012, 04:20 AM
54. ### is causal & invertible Gaussian ARMA(p,q) process strictly stationary?

I have the definition of strict stationary, and causal/invertible ARMA(p,q) process. However, I'm having trouble connecting the dots. We know that...

• Replies: 0
• Views: 4,284
08-12-2010, 03:57 PM
55. ### [SOLVED] New to Probability

Hello! I am taking my first stats course in University, and I am normally pretty good with number (finished with A+s in linear algebra, and...

• Replies: 5
• Views: 4,280
02-01-2012, 11:17 PM
56. ### Video Game Probability Stats

First off, hi! I've never been to this forum, but would like to humbly request help on something a little over my head. 1st problem at hand: ...

• Replies: 0
• Views: 4,279
06-01-2008, 01:55 AM
57. ### exponential distribution: funtional system

Problem: The system is functional if all 3 of its components are in working condition. If lifetime of each components is distributed...

• Replies: 4
• Views: 4,278
07-09-2011, 12:08 PM

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