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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: 30,406
09-30-2005, 09:44 AM
1. ### Basic Probability

6 Boys and 6 Girls sit in a row at random. Find the probability that the boys and girls sit alternately. Please help me with steps to calculate in...

• Replies: 9
• Views: 4,079
10-29-2010, 03:58 PM
2. ### cdf and pdf

consider the following cumulative distribution function F(x) = 0, x<0 =\frac{x+k}{5}, k\leq x<k+1, k=0,1,2 =1, x\geq3 find P(X=j) for all...

• Replies: 9
• Views: 3,367
BGM
11-01-2010, 12:03 PM
3. ### Point (X,Y) is picked inside square

I saw this problem and we have gone over joint probability but I searched all over my textbook and could not find a problem similar. A point (X,Y)...

• Replies: 9
• Views: 6,566
11-09-2010, 12:26 PM
4. ### Probability Homework(2)

The deeper i go into the probability chapter, the more confused i get :(, here are sum questions. they might be really easy but i'm not getting them....

• Replies: 9
• Views: 16,974
02-24-2012, 11:19 PM
5. ### A question on probability

Let X_1, X_2, \ldots, X_{10} be a random sample from N(80, 3^2) distribution. Define S = \sum_{i=1}^{10} U_i T = \sum_{i=1}^{10}\left(...

• Replies: 9
• Views: 2,911
01-30-2011, 11:56 PM
6. ### cumulative distribution function for error

Hi, I need help regarding the generation of cumulative distribution function (CDF) for distance error. I have a system which calculates...

• Replies: 9
• Views: 6,299
03-04-2011, 12:06 AM
7. ### Maximum likelihood estimator question with discrete uniform distribution

Q. A bag contains sequentially numbered lots (1,2...N). Lots are drawn at random (each lot has the same probability of being drawn). Two lots are...

• Replies: 9
• Views: 12,801
BGM
03-06-2011, 01:15 PM
8. ### MLE of range of Uniform(a,b)

So, I want an MLE for (b - a). log L(a,b|x) = -n log (b - a) given a < x_(1) and b > x_(n) but d/da log L gives me n/(b-a) >, and in fact =/=...

• Replies: 9
• Views: 10,971
03-17-2011, 12:13 PM
9. ### probability problem

Hi, First Thanks in advance. I am current studying distance education and struggle with some probability homework Qs. So glad I found this site. ...

• Replies: 9
• Views: 7,158
03-21-2011, 10:35 PM
10. ### Expected Value calculation

I have 2 random variables U and V uniformly distributed on . Their joint cumulative distribution function F(u, v) = min (u,v) on x . Therefore I...

• Replies: 9
• Views: 4,023
06-07-2011, 04:17 PM
11. ### Prob. Question

Hi, I have this question. A guy has to get to office early. There is a 40% chance he will wake late and 25% chance he will be stuck in traffic....

• Replies: 9
• Views: 2,841
06-22-2011, 11:38 AM
12. ### Probability of an event after combining (Union) two sample spaces

Can anybody help me how to solve the following problem. Suppose we have an event x and two sample spaces s1,s2. let the probability of x is 0.3, 0.4...

• Replies: 9
• Views: 5,347
ahb
09-20-2012, 01:25 AM
13. ### Small problem, calculating probability.

Ok so this was my problem on my last exam: NOTE that i am not asking you to solve this problem for me look bellow. Oke. I know how to solve...

• Replies: 9
• Views: 2,420
07-07-2011, 11:27 AM
14. ### Stochastic Problem, any help greatly appreciated

Admittedly I am a bit rusty with my stochastic modelling, but here is the question I have been given. I am just looking for a bit of a guide as to...

• Replies: 9
• Views: 3,434
BGM
10-04-2011, 12:27 PM
15. ### More education = less income?

Years ago a guy from ESA told me that at his 50 year high school reunion the only millionaire was the only guy who didn't go to college. ...

• Replies: 9
• Views: 2,560
10-06-2011, 05:58 PM
16. ### Probability question.

suppose i have a population n=90386 where: typeA=46362, typeB=22012, typeC=22012 if i choose 145 items from the population (without returning...

• Replies: 9
• Views: 2,398
10-26-2011, 09:58 PM
17. ### 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: 5,038
11-06-2011, 03:27 PM
18. ### Simple probability question

I've been writing up some basic code for my own trading to show things like, if I have a 70% chance of losing, and each time I lose 5%, I would...

• Replies: 9
• Views: 2,410
BGM
01-30-2012, 05:00 AM
19. ### 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: 7,664
02-05-2012, 10:32 PM
20. ### geometric prob

hey there, I have a question. X is geometric random variable ~G(1/2) the question: calculate E( (5/4)^x ) = ? Thanks, Jim.

• Replies: 9
• Views: 2,612
02-17-2012, 11:08 AM
21. ### decimal answer need for probability

Happy Meal Problem: McDonalds offers a little toy with its happy meals. They have 5 different toys and each toy has the same probability of appearing...

• Replies: 9
• Views: 3,261
02-28-2012, 08:39 AM
22. ### Binomial Distribution

I really need help with this homework. I've been on one question for over an hour. The Question is The rates of on-time flights for commercial...

• Replies: 9
• Views: 12,063
03-05-2012, 07:24 PM
23. ### Need help to understand basic probability problem

This thread is rather a continuation of http://www.talkstats.com/showthread.php/26030-Meanings-of-a-set-of-data/page3 Let consider following 2...

• Replies: 9
• Views: 2,233
06-25-2012, 09:00 PM
24. ### convergence in probability help

Hey guys, I'm hoping that one of you smarter than me can help me with understanding the concept of convergence in probability. I'm currently using...

• Replies: 9
• Views: 2,748
07-05-2012, 04:09 PM
25. ### Probability of Independent Events

Hi, If hypothetical events A and B are independent, with P(B/A)=.4, and P(A)=.3 What is the P(B)? What formula would you use to figure this...

• Replies: 9
• Views: 2,407
08-05-2012, 12:39 PM
26. ### 50-50 or just abusing the game?

Hi my name is Oscar and I had a question that has been bugging me and some other friends. We cannot wrap our heads around something and we have our...

• Replies: 9
• Views: 2,234
09-25-2012, 02:12 PM
27. ### Find Densities for Exponential Distribution

I am given a general problem: Suppose that X1, ..., Xn is a sample from the Exponential(theta) distribution. Find the densities fx(1) and fx(n). ...

• Replies: 9
• Views: 2,223
09-26-2012, 02:35 PM
28. ### Problem involving selecting players from a Basketball team.

Hi, I want to solve the following problem: Suppose a team of 5 guards and 6 forwards must be selected from a roster of 10 guards and 16 forwards....

• Replies: 9
• Views: 2,152
10-19-2012, 02:16 PM
29. ### 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: 2,182
11-22-2012, 05:09 PM
30. ### Die throwing competition, probability of winning

Suppose a friend and I are playing a game with a fair die. We throw alternatively and whoever rolls a 6 first wins. I get to roll first. What is the...

• Replies: 9
• Views: 2,554
02-26-2013, 08:16 PM
31. ### 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: 1,808
10-23-2013, 01:12 AM
32. ### what's the chance that a number n is prime IF....?

so... a compuer science friend of mine and myself were having lunch together and discussing whether or not studying number theory can be your one-way...

• Replies: 9
• Views: 1,381
06-11-2013, 02:33 AM
33. ### bio stats probability basic problem

: Biostatistics problem. Probability of obtaining positive test results in a diagnostic method. Hello: I have a biostatistics/probability...

• Replies: 9
• Views: 2,167
06-23-2013, 09:31 AM
34. ### Central limit theorem - Approximation the Sum of Bernoullis to Normal Distribution

Hello, I'm new in this forum and I would like to ask for your help. I have a set of Independent Bernoulli random variables, but they are not...

• Replies: 9
• Views: 2,465
06-19-2013, 02:47 PM
35. ### Need help for an exercise about Roulette - Variance calculation

Hello, i'm working on a theoretical Roulette exercise. There are 37 numbers on the roulette, 18 are Red. A player is playing an amount B (his...

• Replies: 9
• Views: 2,390
07-10-2013, 03:19 AM
36. ### This doesn't make sense to me

Can anyone please help me make sense of the following: "Just because something is the most probable outcome doesn’t mean it is the most likely...

• Replies: 9
• Views: 2,198
12-12-2013, 10:37 AM
37. ### Relating Type I and Type II Error to C-charts

Hello, I am trying to figure out how to relate type I and type II error calcuations to c-charts. Ive already calculated the 3 sigma control...

• Replies: 9
• Views: 2,464
04-21-2014, 03:25 PM
38. ### Probability based on multiple pieces of information

It's been about 20 year since my last stats class and I'm working on a fun little side project that involves some probability. I'm having some...

• Replies: 9
• Views: 1,842
07-22-2014, 12:57 PM
39. ### Bivariate transformation?

Hello, I'm having problem with a book question from statistical inference, Casella, Berger excercise 4.19 a). X_1 and X_2 are two i.i.d R.V -...

• Replies: 9
• Views: 1,737
01-11-2016, 08:37 PM
40. ### Another game designer dice question...

Firstly I want to introduce myself. My name is Daniel and I am a game designer (http://www.hazardgaming.com) when I'm not teaching mathematics. I can...

• Replies: 9
• Views: 2,767
04-09-2016, 09:53 AM
41. ### Chebyshev's Inequality problem

Let X ~ Poisson (lambda). With Chebyshev's Inequality, show that P(X >=2 lambda) <= 1/lambda The way I thought to interpret this theorem was...

• Replies: 9
• Views: 2,577
09-27-2016, 09:46 PM
42. ### 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: 4,392
01-09-2006, 09:59 AM
43. ### Thanks to John M & more questions

Thanks to John M for all of his help! I have several more questions that I got wrong answers on and would like to know the correct answers if anyone...

• Replies: 8
• Views: 3,262
04-27-2006, 01:42 PM
44. ### Probability of Death?

Each patient that receives a particular drug has a 4% chance of dying because of the medication. If 200 patients receive this drug, what is the...

• Replies: 8
• Views: 3,866
10-19-2006, 12:05 PM
45. ### sample space

ok, so in this question, there are 6 people, 2 out of 6 can win the prize in the raffle. People: a,b,c,d,e,f and here is the sample space:...

• Replies: 8
• Views: 3,364
03-09-2008, 08:00 PM
46. ### Moment Generating Functions

The random variable X has a uniform distribution on (0,1). Find the moment generating function of Y=-aln(X), and hence find the probability...

• Replies: 8
• Views: 3,824
04-06-2008, 12:26 PM
47. ### PDF and E(Y)

Hi All, I'm going through revision questions, and I am stuck on this particular section all with similar questions. If somebody can give me a guide...

• Replies: 8
• Views: 5,487
05-14-2008, 07:03 AM
48. ### Card Prob.

A deck of cards has all the face cards removed - Aces, Kings, Queens, and Jacks. There are 36 left in the deck, if two cards were drawn at the same...

• Replies: 8
• Views: 3,890
06-01-2008, 05:24 PM
49. ### need help with a couple questions

1) The US Army requires women's height to be between 58 in. and 80 in. Find the percentage of women meeting that height requirement. Women's heights...

• Replies: 8
• Views: 6,897
12-16-2008, 05:15 PM
50. ### Powerball Question: Play To Win

Alright, Tonight I got into an argument with one of my friends. I bought a powerball ticket, and we were talking about whether you should play...

• Replies: 8
• Views: 3,711
01-21-2009, 01:31 PM
51. ### Question on standard unit problem

Mutual Fund A has an average return of $25,000 and Mutual Fund B has an average return of$5,000. The standard deviation for Fund A is \$10,000 and...

• Replies: 8
• Views: 4,255
09-03-2009, 11:56 AM
52. ### probability problem

can anyone help me with this problem? a boy finds that he can climb to a height of at least 1.85m once in five attempts, and to a height of at...

• Replies: 8
• Views: 3,279
02-03-2010, 09:54 PM
53. ### Conditional expectation question

Hey, I would really appreciate your help with the following question: X and Y each has a uniform distribution on and the two are independent....

• Replies: 8
• Views: 5,429
03-06-2010, 02:46 AM

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