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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: 30,208
09-30-2005, 09:44 AM
1. ### Proof of probability of being chosen

This problem is from Mathematical Statistics with Resampling and R, chapter 1. The answer in the back of the book just gives n/N which is the result...

• Replies: 3
• Views: 3,235
08-13-2013, 10:08 PM
2. ### Card draw and joint probability

I wonder if I'm overthinking this and want confirmation... I'm in thought about how to apply (1) to find the probability of 2 not independent...

• Replies: 17
• Views: 5,357
08-12-2013, 03:34 PM
3. ### Regarding joint Probability distribution

Ha All, I have three random variable X,Y and Z, which is related to each other by given relation: Z=X+Y. I want to calculate joint pdf of...

• Replies: 1
• Views: 1,657
08-12-2013, 09:31 AM
4. ### Normal variable day-week multiplication?

Hello Statisticians! I would really appreciate help with this: The mean number of lemonade glasses sold in a day is 15, standard deviation is...

• Replies: 2
• Views: 1,374
08-12-2013, 02:35 AM
5. ### Outcomes of coin toss with restrictions?

Hey guys, Apologies if this is in the wrong area. I'm busy with a non academic project at the moment, and I need to determine the number of...

• Replies: 8
• Views: 2,178
GTG
08-10-2013, 10:49 AM
6. ### Going crazy over probability problem

I'm working through the book Probability Demystified, which has been an okay refresher on basic probability, but is known to contain a lot of errors....

• Replies: 2
• Views: 1,709
08-09-2013, 03:55 PM
7. ### Finding the posterior distribution

• Replies: 0
• Views: 1,169
08-08-2013, 08:26 AM
8. ### Poisson Conditional Probability Question

Hey Guys I've been racking my brain for ages trying to solve this but I can't seem to get the last step. The question is, given 0<u<t ,...

• Replies: 1
• Views: 1,445
08-07-2013, 11:46 PM
9. ### Probability question

I have what some would probably think is quite a simple calculation that is proving very challenging to me. Let's say I have five tennis matches and...

• Replies: 2
• Views: 1,880
08-05-2013, 02:03 PM
10. ### Probability of irregular 10-sided die

I've got an odd question here: I've got a 10-sided die with sides labeled as such: -1, 0, 0, 0, 0, 1, 1, 1, 1, 2 Thus, the odds for a single die...

• Replies: 1
• Views: 1,874
08-05-2013, 11:05 AM
11. ### Question regarding probability of evidence and Baye's rule

Hi Everyone, I am a newbie in probability theory and following is my question: Consider we have two binary random variables A and B. B is...

• Replies: 0
• Views: 876
08-04-2013, 11:47 PM
12. ### Chance of an Occurance

ok, I am an accountant, not a statistician. Something happened to me personally and I would like to figure out the probability that it would have...

• Replies: 8
• Views: 2,961
07-30-2013, 11:49 PM
13. ### how did Komogorov's Probability axioms became axioms?

i was reviewing some of my notes on real analysis yesterday and started thinking about something my prof said the first day. he commented on how...

• Replies: 5
• Views: 3,217
07-30-2013, 05:46 PM
14. ### Probability Question

Working through an sample paper for an upcoming exam and I've been struggling with the following stock trading problem "A total of 576 such...

• Replies: 7
• Views: 1,755
07-30-2013, 11:17 AM
15. ### Box with balls that change colors

Hello ! I'm stuck with this problem Suppose that I have a box that contains n balls, where i are white, the others (n-i) are black. if I get a...

• Replies: 1
• Views: 1,876
BGM
07-30-2013, 12:55 AM
16. ### High/low between 1-10 game odds

I'm trying to figure out the odds for a game where a number between 1 and 10 are drawn randomly, and the player must guess if the next number is...

• Replies: 2
• Views: 2,243
07-28-2013, 11:29 AM
17. ### counting probability

i need some help counting probability using Bayes theorem given that 1/10 of message is a spam message. spam detector will correct identify a...

• Replies: 5
• Views: 2,083
07-28-2013, 09:27 AM
18. ### arrangement problem

a class has 10 students,every student is given 3 mobile phones with 3 sim for free communication... for every sim ,a set of duplicate sim is...

• Replies: 0
• Views: 1,482
07-26-2013, 02:11 AM
19. ### Question on stopping times

I wonder if anyone can help me with this please: Suppose i have an increasing sequence of stopping times \rho_{n} which converges with...

• Replies: 0
• Views: 1,177
07-25-2013, 06:17 AM
20. ### 7 Balls in 7 Buckets

Hi, Say I have 7 balls I can put in 7 different buckets. Define Xn to be the number of buckets with n balls. For instance X3 = 1 is the number of...

• Replies: 0
• Views: 1,148
07-24-2013, 11:10 PM
21. ### Combinatorics

Hey guys. I really struggle with combinatorics/permutations... It seems like I can't possibly translate a verbal question onto math. This mainly...

• Replies: 1
• Views: 1,840
BGM
07-24-2013, 06:26 AM
22. ### Probably a simple problem

This is a long question, so I'll put it in quotes. Sorry for the lame title, but I wasn't sure what else to call it. It's essentially a very basic...

• Replies: 2
• Views: 2,186
07-23-2013, 02:03 AM
23. ### Student t Distribution

Hi, I've been going over this question for a while now and can't get my head around it, I'm definitely more of a mechanics person so I had to cave in...

• Replies: 1
• Views: 1,807
07-22-2013, 10:47 AM
24. ### Inquisitive son problem!

Hi, I'm not sure if this is the right place to post but here goes... My son and myself have been building a quincunx machine as part of a project...

• Replies: 5
• Views: 1,844
07-21-2013, 02:35 PM
25. ### Odds of successive outcomes with weighted probabilities

Hello, I am a statistics and probabilities novice and I'm having trouble with this problem. I'll lay out an example: Team A and team B are playing...

• Replies: 2
• Views: 1,870
07-19-2013, 01:06 AM
26. ### Binomial Distribution / Consecutive Odds Question

Hi everyone, Looking to solve a 3 part problem. My answers to the first 2 parts agrees with the textbook answers, but I'm confused by the 3rd...

• Replies: 0
• Views: 5,432
07-18-2013, 06:18 PM
27. ### Do I use Poisson distribution to solve this problem?

A surveillance camera detects 30 persons every minute. What is the probability that there will be no detections in an interval of 7 seconds? Can...

• Replies: 4
• Views: 1,678
07-17-2013, 03:04 PM
28. ### Having trouble figuring out this probability density function problem

Determine the value of c such that the function f(x,y) = c(x+y) a) is a joint probability density function over the region 0 < x < 3 and x < y <...

• Replies: 1
• Views: 1,934
BGM
07-16-2013, 02:48 PM
29. ### Understanding density functions

Hello Let take for example the normal probability density function. How come the area underneath equals the probability of less than or equal to...

• Replies: 0
• Views: 1,636
07-16-2013, 02:40 PM
30. ### Game Coding: Calculating The Stat Growth Chance Over Several Levels

Hello! I'm working on a computer game, specifically character creation. The game uses an attribute growth system identical to the one in the Fire...

• Replies: 7
• Views: 2,076
07-16-2013, 02:40 PM
31. ### Best unbiased estimator of a function of a estimator

Hi, I'm having a small problem with the following problem: From the factorization theorem I know that \max{X_i}=X_{(n)} is a sufficient...

• Replies: 2
• Views: 1,735
07-15-2013, 10:29 AM
32. ### Rats and lights and shocks and a probability question that is vexing me

I study Pavlovian fear conditioning and have some data consistent with the possibility that a rats response to a stimulus (a 3 second light) that was...

• Replies: 3
• Views: 1,486
07-14-2013, 07:38 PM
33. ### Is it possible to generate a distribution curve only knowing the mean, min & max

Can anyone tell me whether it is possible - and if so how - to generate a distribution graph with just three known values. The values I have are: ...

• Replies: 1
• Views: 2,432
07-13-2013, 06:46 AM
34. ### A Problem on Joint Probability Distribution

Hello people, I found this problem in an exam but i could not go very far on this. Problem: Let X and Y be jointly distributed random variables...

• Replies: 4
• Views: 4,386
07-12-2013, 10:20 PM
35. ### Using the normal probability distribution to approximate the binomial

Hi everyone! I'm taking an online elementary stats course as a prerequisite. Even though my once-solid math skills are totally rusty seven years...

• Replies: 2
• Views: 3,484
07-11-2013, 07:06 PM
36. ### interpret conditional probabilities and inferring ratios

Hi All First time here and its been a long time since I studied probability...was hoping someone could assist in the interpretation of some data I...

• Replies: 0
• Views: 892
07-11-2013, 01:54 AM
37. ### Consecutive outcomes of events

I am trying to figure out the probability for not having consecutive like outcomes from a large sample and can't figure out where to begin. Say...

• Replies: 1
• Views: 1,945
BGM
07-11-2013, 12:08 AM
38. ### 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: 2,366
07-10-2013, 03:19 AM
39. ### help w/puzzle

Thnx thnx thnx

• Replies: 2
• Views: 1,197
07-09-2013, 11:06 PM
40. ### Problem about Gaussian process

Hi everyone, I've been trying to solve an exercise that's driving me crazy, I'd be very glad if someone could help me. I have a Gaussian process...

• Replies: 2
• Views: 1,457
BGM
07-09-2013, 01:14 AM
41. ### Interpreting parameter estimates (ERGM)

Hi anyone could help me with the following? How do I calculate and interpret departure from non-randomness or likelihood of such configuration...

• Replies: 1
• Views: 2,398
07-08-2013, 03:10 AM
42. ### Dirichlet distribution

I computed mean, variance and covariance of the Dirichlet distribution. To do so, I computed E, E and E. This is the first time I've dealt with...

• Replies: 2
• Views: 1,398
07-07-2013, 07:01 AM

a) use normal approx P( x>810) = P ( z> (810-.73*1100)/(.73*.27*1100))=.4871 or 48.71% b) P (x<1030) = P(z<...

• Replies: 1
• Views: 1,876
07-07-2013, 04:34 AM
44. ### Poisson distribution problem

Hello everybody, Im needing some help with the following problem: The number of defects every 100meters responds to a Poisson distribution with...

• Replies: 5
• Views: 1,482
BGM
07-05-2013, 12:38 PM
45. ### Game: multiple denominations, multiple repeating ident. cards of diff. qty's

Problem description: Example: 51 cards, 15 different denominations, 7 have 5 identical cards each (total cards = 35), 8 have 2 identical cards...

• Replies: 3
• Views: 1,752
BGM
07-05-2013, 12:22 PM
46. ### 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: 3,355
BGM
07-05-2013, 12:14 AM
47. ### Calculating number of individuals from probability

Hello everyone, I am a little new to statistics - so sorry if this sounds very basic to most of you - but I have been scratching my head over this...

• Replies: 4
• Views: 1,367
07-04-2013, 09:00 PM
48. ### correct probability distribution

stupid question i know, but when a question asks me to identify the correct method of PB what exactly do i have to do? thanks :)

• Replies: 3
• Views: 1,967
07-04-2013, 04:42 PM
49. ### Central Limit Theorem

True or False. According to the Central Limit Theorem, the expected value for a sample mean approaches 0 as the sample size approaches infinity. I...

• Replies: 1
• Views: 2,258
07-01-2013, 07:55 PM
50. ### are mixture of Gaussian distributions still elliptical distributions?

basically what the title of the thread says, lol. most of my google searches point towards a 'yes' (which is good) but i just wanted to run it...

• Replies: 10
• Views: 2,310
07-01-2013, 03:07 PM
51. ### Simple Combinatorics Question

Hello, I have to solve the following problem: "There are N Books and p are indistinguishable. How many possibilities exists, to put them side by...

• Replies: 1
• Views: 1,971
06-30-2013, 08:06 AM
52. ### Conditional expectation, normal distributions

I'm having some trouble with the following problem: Problem: Let X and Y be independent N(0,1) random variables. Determine E(X|X>Y) My...

• Replies: 4
• Views: 7,859
BGM
06-27-2013, 05:38 PM
53. ### Factor Analysis PROOF

This question pertains a small result in Factor Analysis, under what is called the Orthogonal Factor Analytic Model, where the decomposition of the...

• Replies: 2
• Views: 2,868
06-26-2013, 09:43 PM
54. ### need help understanding interview question

Hello folks, I had a weird question which I am confused about. I was wondering if you anyone could help me or point me in the right direction (ie....

• Replies: 21
• Views: 4,538
BGM
06-24-2013, 12:41 PM
55. ### 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: 2,144
06-23-2013, 09:31 AM
56. ### understanding confidence: help refresh my memory

ive been searching on the internet but the web pages ive read havent been enough to jar my memory. i took statistics and probability in college but i...

• Replies: 2
• Views: 1,509
BGM
06-22-2013, 02:23 PM
57. ### Multiplication Theorem on Probability and proof

Hi Everyone! I'm with Conditional Probability and I don't understan this theorem. Theorem: If then Proof:

• Replies: 1
• Views: 6,083
06-22-2013, 11:22 AM
58. ### law of total probability origin?

Hello - I was curious about the origin of The Law of Total Probability, specifically who slated this law and when? Wikipedia provides an overview of...

• Replies: 0
• Views: 886
06-21-2013, 07:06 PM

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