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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: 30,168
09-30-2005, 09:44 AM
1. ### A Drunkard's Random Walk

Here's a homework problem that I need a hint to get started. D drunkard is taking a random walk. he canstep north or shouth with probability .5...

• Replies: 3
• Views: 4,766
10-26-2008, 10:04 PM
2. ### Variance?

Hi All, In an assembly-line production of industrial robots, gearbox assemblies can be installed in one minute each if holes have been properly...

• Replies: 0
• Views: 4,763
04-05-2009, 10:59 AM
3. ### exponential distribution light bulbs hypothesis testing

Two companies make a similar light bulb. Suppose random samples of light bulbs from both companies are obtained and the lifetimes for these light...

• Replies: 3
• Views: 4,761
BGM
10-06-2011, 12:05 PM
4. ### Probability of a player winning a best-of-n contest with a given current scoreline...

Many sports are played over a best-of-n format, where the first player to reach a specified number games won wins the overall contest. An example...

• Replies: 8
• Views: 4,758
01-16-2012, 10:24 AM
5. ### Joint/Marginal PDF question

OK, I have this problem on my hw I am struggling through. Random vector (X,Y) has the joint pdf f(x,y) = c(x^2+y^2), for x^2+y^2<1, and = 0...

• Replies: 1
• Views: 4,750
07-31-2008, 04:33 PM
6. ### I need help ASAP!?!?!

I am having trouble with these problems on my homework. I can't seen to grasp the concept and set up on how to solve these problems. The numbers...

• Replies: 1
• Views: 4,746
10-09-2006, 10:26 AM
7. ### I need help with this probability problem

Hello everyone, I am trying to figure out which probability formula/approach I should use. Any help is greatly appreciated! :) Let's say that...

• Replies: 2
• Views: 4,745
12-26-2008, 12:32 PM
8. ### Simple probability question

Test question: Assume that it is equally likely for a pregnancy to deliver a baby boy or a baby girl. Suppose that for a particular large...

• Replies: 4
• Views: 4,745
05-06-2010, 12:25 PM
9. ### normal approximation to binomial distribution.

hi everyone. so i have this stupid final project and i'm pretty sure i know how to do it but i just wanted to check my method. the question...

• Replies: 0
• Views: 4,742
01-21-2008, 06:59 PM
10. ### On estimating an underlying probability distribution

Dear Forum readers! Every now and then our university makes a poll among the students, asking questions like "How good was the lecture" to which...

• Replies: 2
• Views: 4,742
01-04-2011, 10:00 AM
11. ### Baye's Formula Confusion!

Hello, I think I have answered most of this question correctly, but do not quite understand how to find P(D^c|F^c) . The question is as...

• Replies: 3
• Views: 4,737
01-13-2013, 06:49 PM
12. ### Baye's Rule Help

Hello I have this question and I am having trouble figuring it out. Medical case histories indicate that different illnesses may produce...

• Replies: 3
• Views: 4,733
BGM
03-09-2012, 12:43 PM
13. ### Help!

I need help with this problem: a wildlife biologist examines frogs for a genetic trait he suspects may be linked to sensitivity to industry toxins...

• Replies: 2
• Views: 4,725
04-26-2007, 12:27 AM
14. ### Probability Problem related to Actuarial Sceince P1

An insurer o ers a health plan to the employees of a large company. As part of this plan, the individual employees may choose exactly two of the...

• Replies: 0
• Views: 4,724
02-26-2010, 09:18 AM
15. ### Poisson Distribution

Hi all, it's me again! Just got a quick question here with the poisson distribution. Suppose messages arrive at a voice mail system according to a...

• Replies: 4
• Views: 4,723
04-06-2009, 10:23 AM
16. ### mathematical expectation

A despondent math professor is traveling to Las Vegas to bet his entire life savings, \$20,000, on one roll of the (two) dice. If the total is 7 or...

• Replies: 4
• Views: 4,721
04-27-2006, 10:47 AM
17. ### Transformations....again!

Let X, Y ~ Uniform(0,1). Define the PDF of i) X - Y ii) X/Y I know this problem can be solved by creating a picture and looking at the areas....

• Replies: 4
• Views: 4,720
12-06-2010, 10:57 PM
18. ### Probability ?

Assume that each year the IRS randomly audits 10% of the tax returns. If a married couple has filed seperate returns, a. what is the prob that both...

• Replies: 1
• Views: 4,715
11-15-2006, 06:01 PM
19. ### Need some help with basic probability!

Hey, I need some help with two probability question, and I would really appriciate all the help I can get! QUESTION 1: (a) A quality inspector...

• Replies: 5
• Views: 4,715
09-16-2011, 03:43 AM
20. ### deciles

Women's weights are normally distributed with a mean of 143 lb and a standard deviation of 29lb. Find the third decile, D3, which separates the...

• Replies: 1
• Views: 4,714
10-24-2005, 12:20 PM

A college use two different textbooks during the last semester. During last semester 0.7 students used the text book by Professor B. and 0.3 students...

• Replies: 4
• Views: 4,713
02-18-2009, 12:56 AM
22. ### Homework Problem

Hi, I am a beginner in statistics, and can't figure out this problem: "In a highly publicized murder trial it was estimated that 25 percent of the...

• Replies: 3
• Views: 4,712
03-31-2011, 12:47 AM
23. ### Finding probability of passing test by guessing

Hello, I am confused about this problem: There are 50 4 choice questions out of which at least 25 must be correct in order to pass. If a student...

• Replies: 2
• Views: 4,705
10-01-2012, 11:23 PM
24. ### Am I right?

The odds are two to one that when A and B play tennis A wins. Suppose that A and B play two matches. What is the probability that A wins at least...

• Replies: 2
• Views: 4,701
09-01-2006, 06:37 PM
25. ### another Probabilty distribution :)

Hi, okay here is another probabitly question that I was having trouble with. Q1: A company services home air conditioners. It is knwon that time...

• Replies: 0
• Views: 4,700
06-01-2006, 08:46 PM
26. ### Conditional Expectation Problem

Hi all I need to solve the following problem: If E(X|Y)=Y and E(Y|X)=X, prove that X=Y almost surely. Seems like I'll need to use the...

• Replies: 5
• Views: 4,697
BGM
03-26-2011, 12:36 PM
27. ### Probabilities. Is this correct?

In a study of fingerprints, an important quantitative characteristic is the total ridge count for the 10 fingers of the individual. Suppose that...

• Replies: 0
• Views: 4,693
10-19-2007, 07:07 AM
28. ### 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: 4,690
11-22-2005, 03:47 PM
29. ### Probability that one group of successes will be greater than another

So, I'm working on this big old nerdy project, but I haven't got much of a head for statistics. I was wondering if someone would be able to help me....

• Replies: 5
• Views: 4,688
08-26-2009, 11:34 AM
30. ### reallyneedhelpwithexpectedvalues

I was wondering if anyone could help with the following: Magazine has 1,620,000 subscribers 640,000 - women 980,00 - men 30% OF WOMEN read...

• Replies: 3
• Views: 4,686
10-23-2006, 11:27 PM
31. ### Probability - Multiplication/addition rules?

I have been working on this problem and have come up with answers, but I have a feeling they are wrong...Hoping people much more intelligent in...

• Replies: 6
• Views: 4,686
07-01-2008, 11:16 PM
32. ### help with expected value

1. Let X,Y and Z be 3 random variables, and X and Z are independent. Prove that Cov(X+Y,Z)=Cov(Y,Z). For this i expanded into E(Z(X+Y)) -...

• Replies: 6
• Views: 4,686
11-07-2010, 01:09 PM
33. ### Dice probability question - Settlers of Catan

Hello everyone, Let me begin by saying that this isn't a homework question. Rather, this is a question that relates to a personal inquiry into...

• Replies: 3
• Views: 4,685
BGM
12-07-2013, 06:40 AM
34. ### moment generating function problem

Hi everyone, I'm stuck on a probability problem and was wondering if anyone could help me get started? I would really appreciate it! Let X,Y,Z be...

• Replies: 3
• Views: 4,678
BGM
11-21-2010, 09:57 PM
35. ### conditional probability and mgf question

Hi i'm having trouble doing this question, any help would be much appreciated The time needed to defuse the bomb is modeled by a continuous...

• Replies: 2
• Views: 4,676
09-12-2010, 05:44 PM
36. ### Computing pobabilities for any normal probability Dist.

Greetings all, I am a math challenged individual in the middle of a stats class and (you've heard it before) seriously struggling with story...

• Replies: 2
• Views: 4,672
10-14-2012, 03:23 PM
37. ### kurtosis

Hi, I am calculating the skewness of returns of 10,000 randomly selected portfolios with different portfolio sizes(where assets range from 2 to...

• Replies: 2
• Views: 4,668
11-17-2006, 09:47 PM
38. ### pls help me with im desperate

a local bank reports that 70% of its customer maintain a chequing account, 50% have a savings account an d 40% have both. of a customer is chosen...

• Replies: 2
• Views: 4,663
08-31-2006, 11:42 PM
39. ### Random sample from a gamma distribution, several questions about same problem

Consider a random sample X1, X2, ... ,Xn from a Γ(α=3, λ=1/θ) distribution. So far i have figured the following out: p.d.f = /3Γ] x^2 e^(-x/θ)...

• Replies: 1
• Views: 4,654
03-24-2009, 11:50 AM
40. ### 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: 4,653
10-22-2006, 02:53 PM

Hey all, I'm currently a stats student and i have run into confusion about some questions pertaining to probability. I have attempted the following...

• Replies: 14
• Views: 4,653
01-20-2011, 12:06 PM
42. ### Binomial Probability Distributions

I am having alot of difficulty in my bio-statistics class can anyone help with these 2 questions? Create pmf and histogram before answering these...

• Replies: 1
• Views: 4,651
BGM
10-06-2009, 01:08 PM
43. ### Bionomial distribution:expected value problem question

: The FBI Standard survey of crimes shows that for about 80% of all property crimes, the criminals arenever found and the case is never solved....

• Replies: 3
• Views: 4,645
10-08-2012, 04:48 AM
44. ### Dependent or Independent

Hello, I am asked the following in an assignment: Let A be the event that a letter picked at random from a piece of English text is T and let B...

• Replies: 11
• Views: 4,644
11-03-2010, 12:57 PM
45. ### central limit theorem question check?

Hi! The question states: "Suppose that, historically, one-third of the graduating seniors at a certain college have two parents who attend the...

• Replies: 0
• Views: 4,641
10-28-2007, 03:06 PM
46. ### candy

A candy store owner has daily demand Y for a certain brand of candy sold from the bulk bins. Suppose the owner will never stock more than one...

• Replies: 5
• Views: 4,634
10-25-2005, 04:51 PM
47. ### i hope i make JohnM and quark proud

:eek: okay i managed to do a bonus question on my "take home test" (which is kinda :) . I just want to see if I did it right and answered it...

• Replies: 5
• Views: 4,630
10-10-2005, 08:33 PM
48. ### Homework Help - Balls in Urn problem (hypergeometric distribution?)

Hi all, I need help with the following problem: The urn contains 5 black and 8 red balls. You close your eyes and remove balls from the urn...

• Replies: 5
• Views: 4,626
04-29-2011, 10:18 AM
49. ### Given Joint Density Function

f(x) { x(1+3y^2)/4 0<x<2, 0<y<1 0 otherwise 1. Find g(x), h(y) 2. Find f(x|y) 3.Evaluate P(1/4<x<1/2 | Y=1/3) in getting g(x) is this...

• Replies: 5
• Views: 4,625
BGM
03-10-2011, 04:10 PM
50. ### HELP! Please! Test on Monday!

:eek: Need help with these two. Have tried and tried and tried. Q1 Recent developments appear to make it possible for couples to dramatically...

• Replies: 1
• Views: 4,621
04-03-2006, 09:01 AM
51. ### probability confusion

Hello everyone!!! I don't know if im experiencing a brain-fart these days, but I just can't figure this out. Here's a problem. I have more like...

• Replies: 4
• Views: 4,618
10-31-2006, 10:34 PM
52. ### everything in life has a probablity of 50-50

take a minute to think about this: everything in life has a probability of 50-50. it either happenes or it doesn't. I have never inderstood why...

• Replies: 3
• Views: 4,617
05-23-2007, 03:38 PM
53. ### Moment Generate function

Suppose we were to play a game with the following rules. We pay seven dollars to play the game. We then flip a (possibly biased, probability of heads...

• Replies: 5
• Views: 4,615
12-06-2010, 04:27 PM
54. ### conditional expectation and variance

Hi there, Suppose X~Exp(lam). We have a sample from X of size n. Knowing that the data follow the exponential diastribution, we fit the...

• Replies: 4
• Views: 4,610
02-09-2009, 01:54 PM
55. ### Probability & (possibly) Binomial Distribution

Problem: A certain drug causes kidney damage in 1% of patients. Suppose the drug is to be tested on 50 patients. Find the probability that: (a)...

• Replies: 2
• Views: 4,610
10-18-2012, 06:11 PM
56. ### Poll: Let's Make a Deal....

Monty Hall presents you with 3 doors. Behind one of the doors is a new car. Behind the other 2 doors, there's nothing. You make your choice of...

• Replies: 2
• Views: 4,608
10-17-2005, 10:14 AM

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