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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: 30,328
09-30-2005, 09:44 AM
1. Coin Fliipping or Rats at Vertices

I'm aware that if you play the coin flipping game where the winner is the first to get a head the player who goes first has a 2/3 chance of winning....

• Replies: 1
• Views: 1,965
BGM
04-01-2012, 02:01 PM

• Replies: 1
• Views: 2,462
12-09-2005, 09:30 AM
3. Distribution of the Sum of r.v.

Guys, I will appreciate if you can give me some hints on this problem: Let X1,X2,...Xn be i.i.d with mass function f(k)= / for k>1. Find the...

• Replies: 6
• Views: 2,773
10-31-2010, 12:00 PM
4. Do you recognize this distribution?

I'm pondering the probabilities involved in playing a certain fantasy wargame. For the most part, this game works on a dice pool mechanic can be...

• Replies: 0
• Views: 2,050
03-15-2010, 11:17 PM
5. Need some homework help. (work provided)

Hey guys my current book I am using is statistics and the author is weiss just fyi. I am real confused about a concept. here is the question. ...

• Replies: 1
• Views: 2,738
11-22-2006, 11:15 AM
6. Random Variable Probability HW Help.

I am lost due to the fact that extra information was provided. An investor plans to invest \$50,000 in one of four investments. The return on each...

• Replies: 3
• Views: 6,898
12-07-2006, 07:54 AM
7. Probability Question from Frederick Mosteller, #7

Hey all, I'm trying to improve my probability skills so hopefully the questions I'm asking aren't too amateur-ish. The following is a question...

• Replies: 1
• Views: 1,936
09-27-2013, 01:01 PM
8. Understanding independent events.

There is a problem I do not understand: Government data show that 8% of adults are full-time college students and that 30% of adults are age 55 or...

• Replies: 1
• Views: 130
Yesterday, 09:02 AM
9. Mainly interested in knowing if a solution is even possible.

P(A U B) = .7 P(A U compliment of B) = .9 Find P(A) I've racked my brain and cannot come up with an answer. This is all I've...

• Replies: 1
• Views: 2,160
09-16-2009, 09:01 AM
10. lottery probability

• Replies: 1
• Views: 1,896
BGM
04-21-2012, 02:27 PM
11. probability question (re success)

• Replies: 1
• Views: 1,467
BGM
04-21-2012, 02:31 PM
12. probability question

The probability that an individual recovers from an illness in a one-week time period without treatment is 0.1. Suppose that 20 independent...

• Replies: 1
• Views: 4,198
04-28-2012, 09:55 AM
13. probability question

The number of cracks in a section of interstate highway that are significant enough to require repair is assumed to follow a Poisson distribution...

• Replies: 2
• Views: 3,003
04-29-2012, 03:03 PM
14. poisson problem

The number of cracks in a section of interstate highway that are significant enough to require repair is assumed to follow a Poisson distribution...

• Replies: 1
• Views: 2,228
04-28-2012, 09:36 AM
15. Probability Question

Hi Guys, I'm a novice at probability and would be very appreciative of some assistance with this question: If Company A (car manufacturer)...

• Replies: 5
• Views: 3,944
01-14-2011, 04:21 AM
16. 99% Confidence Interval

Hi Guys, I'm stuck and need a little help on this one. I have calculated mean: 74.40 and Std Dev: 12.251 from Population 262, Sample 103. I...

• Replies: 3
• Views: 5,518
01-23-2011, 05:15 PM
17. Multivariate probability density and distance... help!!

Hi all. I'm far from a stats connoisseur, and will probably use all the wrong words and describe my problem poorly. But I've got to figure it out...

• Replies: 0
• Views: 1,793
05-01-2012, 11:58 AM
18. Computing probability density function

If I know the probability distribution of two variables, say x and y, i.e. I know that P(x) and P(y) are both gaussian, how would I compute the P(R)...

• Replies: 4
• Views: 1,741
07-01-2012, 11:17 PM
19. Matching Numbers from two baskets

Hey guys, I would very much appreciate your help here, as I'm stuck with this problem since a couple of evenings now: I have an interval of...

• Replies: 2
• Views: 2,137
10-24-2008, 02:28 AM
20. binary sequence statistics

Hi all, I have a problem. Supose a random sequence: 011000101010101_? I want to find the probability of next number comes 0 or 1. So i want to...

• Replies: 0
• Views: 1,204
11-15-2013, 09:48 AM
21. Probability of 4 of n shots hitting.

Hello. First timer here, hopefully you guys can help me! First of all, let me say that this is not a homework problem of any sort, it's for a...

• Replies: 6
• Views: 3,767
10-26-2010, 01:18 PM
22. Two events meeting

Hello everyone, I have a question regarding two events that take place randomly over a certain time period and meet. A similar problem would be...

• Replies: 4
• Views: 858
09-23-2015, 12:36 PM
23. Introduction to Statistics question

Hello All, I have a question on my study guide that says A random sample of 64 observations produced the following summary statistics: sample...

• Replies: 1
• Views: 3,868
04-30-2007, 08:17 AM
24. Binomial Question

Current medical studies indicate that 30% of the population will suffer from the flu each winter. A group of 12 people is randomly selected. a....

• Replies: 3
• Views: 2,420
12-02-2009, 08:08 PM
25. 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
26. Line Segment Probability

Question: Divide the line segment into 3 parts by selecting 2 points at random from . Find the probability that the largest part is at least 2...

• Replies: 0
• Views: 3,534
10-25-2010, 02:12 PM

Hi guys! I have a question: There is link on the main google page with CTR 1.5% (CTR is number of clicked visitors divided by number of all...

• Replies: 0
• Views: 981
04-19-2015, 11:51 AM
28. Multiple normal distributions

Post removed.

• Replies: 0
• Views: 2,775
bcs
01-26-2007, 07:04 PM
29. estimating likelihood

First off, this isn't homework question, just trying to figure it out. Imagine you have a box with a window. You make an observation through the...

• Replies: 2
• Views: 2,691
12-05-2011, 02:12 PM
30. Derived Random Variable

Can someone please explain the idea behind this to me? My text says "Assume X is a random variable. Then we can define another r.v. Y = g(X). ...

• Replies: 2
• Views: 3,529
03-03-2012, 07:43 PM
31. Pascal Random Variable

I've got a test coming up and I'm redoing all of my old homework to make sure I understand everything. I ran across this gem and really have no clue...

• Replies: 0
• Views: 3,893
03-03-2012, 07:56 PM
32. Calculating probability of multiple events

This is my first post so I hope I can get my question across reasonably intelligently. I have calculated the probability of an event occurring for...

• Replies: 3
• Views: 13,440
11-26-2008, 05:24 AM
33. Expected values of bivariate distribution

Hi guy's, To calculate Eor E of a bivariate pdf fXY(xy) Do you treat them seperately ie to calculate E E= \int x f(x,y)dx or to calculate...

• Replies: 2
• Views: 6,065
05-10-2009, 03:58 PM

This problem is driving me crazy! The length of time to complete a door assembly on an automobile factory assembly line is normally distributed...

• Replies: 7
• Views: 17,754
12-18-2005, 01:56 PM

Hi everyone. Not sure if this is the right forum but I'll give it a go. Q: If you draw a circle on a sphere, what are the odds that a randomly...

• Replies: 3
• Views: 1,158
BGM
05-07-2015, 08:58 AM
36. Probability

Let X1,…,X25 be binomial random variables with identical parameters n=100 and p=0.3. Use the central limit theorem to calculate the probability that...

• Replies: 2
• Views: 2,057
06-21-2007, 11:47 PM

Hi guys, I have a problem which should be pretty basic, but I cannot remember how to do it. There is a probability p that one water customer...

• Replies: 9
• Views: 3,251
02-18-2006, 02:30 PM
38. Conditional Probability - Exam

Someone can help me please, I need to understand them for my exam on Monday in next week. Today is Saturday.....Thanks a lot..... USING AND...

• Replies: 2
• Views: 29,997
07-13-2016, 01:00 AM
39. Normal Distribution Question

Hi, Can someone please help? Product A has mean of 2980 and std dev of 500. Product B has mean of 3000 and std dev of 800. Both are normally...

• Replies: 0
• Views: 2,608
10-20-2007, 06:17 PM
40. Question regarding Z Scale - Is my answer correct?

Here is the question. A company markets salmon in cans. It claims that the net mean weight of the cans is 8 and the standard deviation is .04. ...

• Replies: 2
• Views: 4,148
10-12-2010, 09:41 AM
41. Probability Homework problem

My 7-grade daughter brought this problem home today and having trouble figuring it out. Each box contains a pen with one of four colors, equally...

• Replies: 3
• Views: 3,128
01-22-2017, 02:49 PM
42. Joint distribution of noncentral t statistics

Hi, I need to compute a probability which is described by the joint distibution of 2 non-central t statistics. If somemody knows references...

• Replies: 4
• Views: 2,470
09-03-2008, 10:30 AM
43. Probability Question

Problem I'm working on. Mean-242.2; Standard deviation =45.4; Using a normal probability distribution function I have calculated various...

• Replies: 0
• Views: 2,082
06-28-2006, 05:15 PM
44. Kernel density estimation for non-I.I.D. data

Hi - This is my first post here, so let me know if I'm out of order in any way. I am wondering if Kernel Density Estimation (KDE) is appropriate...

• Replies: 0
• Views: 3,256
12-11-2009, 01:34 PM
45. Weighted multivariate hypergeometric distribution?

Hi, I'm writing a simulation where part of it can be done using the following steps: 1. Choose 1 element from with probability without...

• Replies: 4
• Views: 3,215
11-28-2011, 07:05 PM
46. Binomial Test in Excel

What is the probability of getting AT LEAST 79 out of 90 correct on a True or False test if you are guessing on every question? I think I need to...

• Replies: 0
• Views: 2,322
12-06-2014, 04:46 PM
47. Linear combination of empirical distributions for independent rvs

Hi there, I have n independent rvs: X1, ..., Xn. I have obtained the empirical distribution functions F1, ..., Fn for each of the rv. Is it...

• Replies: 0
• Views: 2,644
10-01-2008, 12:13 PM
48. HELP: Creating an ordered list of objects; independent/dependent events

Let us say that I have an ordered list of objects (numbered balls). From this list of N balls, I am going to choose seven of them and place them...

• Replies: 0
• Views: 1,013
02-11-2013, 07:19 PM
49. Probability Function Help

During my college days, I used my statistics classes to help me understand the probabilities of various roleplaying games, including Vampire, the...

• Replies: 0
• Views: 1,117
12-22-2015, 11:29 AM
50. Need help on probability calculations

Hi folks, I have to solve some problems with probability exercises and need helpt to understand how to find the right solution. Here it comes:...

• Replies: 1
• Views: 1,588
06-14-2011, 12:49 PM
51. Probability Problem

This isn't for homework this is for my personal curiosity. Here's the problem. You pick 5 colors at random from a bag with an infinite amount of...

• Replies: 3
• Views: 2,386
BGM
12-14-2012, 12:33 AM
52. Game Theory Question

Hello gurus, I got involved in a debate with my sister this evening, and despite (what I thought) was a relatively simple problem, I couldn't...

• Replies: 2
• Views: 1,634
09-17-2012, 10:37 PM
53. how do u work out this problem?

Hi There, there is one problem that is killing me. I will appreciate any help. From what I’ve learnt so far it relates to Binomial distribution. ...

• Replies: 1
• Views: 4,030
10-24-2010, 11:12 AM
54. Counting question

Hey, I am not able to find the number of combination when I have 100 varaibles... with 2, I have: AB: A - B - AB = 3 combinations with 3, I...

• Replies: 2
• Views: 3,215
06-04-2008, 08:53 PM
55. Assistance with Probability example

Consider a very simple card game, there are 16 cards. The cards have 4 ranks (Jack, King, Queen and Ace) and 4 suits (Clubs, Diamonds, Hearts and...

• Replies: 0
• Views: 1,038
01-28-2016, 07:02 AM

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