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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: 13,043
09-30-2005, 09:44 AM
1. ### Noob question about "combined" probabilities.

Hello! Sorry for my poor english, I´m from Argentina. And sorry too if I´m in the wrong place. I need some knowledged about stats and this forum...

• Replies: 9
• Views: 188
BGM
Today, 01:31 AM
2. ### Help in solving a question

Hello everyone, I am working on some exercise questions from probability. I am stuck at this question. Can somebody help me to solve this. I would...

• Replies: 0
• Views: 40
Yesterday, 04:09 PM
3. ### Hypergeometric distribution appears to have hidden problems

When I was writing a computer program to calculate hypergeometric distributions probabilities I had some funny results. This is because I just used...

• Replies: 1
• Views: 54
Yesterday, 01:34 PM
4. ### Probability of an accident

Looking for help with this problem: A train will pass the same point every 7.5 minutes everyday of the week from 4am to 8am. There are 3380...

• Replies: 6
• Views: 215
Yesterday, 12:24 PM
5. ### Layperson with a question

Hello! A friend of mine recently asked me for help with this, and while we kicked around a few ideas, we weren't really satisfied. That, and the fact...

• Replies: 11
• Views: 449
07-27-2015, 07:44 PM
6. ### Help with Bayesian question please

Just got a question with Bayes problem, I always struggle to understand the actual question in Bayes problems so that could be why I'm stuck, but...

• Replies: 48
• Views: 913
07-27-2015, 09:48 AM
7. ### Probability of 20 people drawing the same card 9 or more times in a deck of cards.

Hello! This is my first post so apologies if I'm out of line :-S! I've looked EVERYWHERE and haven't found a problem that I an use as a model... I've...

• Replies: 2
• Views: 155
07-26-2015, 06:58 AM
8. ### Help is needed for a probability question

Homework needs to be done during the weekends. Question is A box contains 2 red balls and 4 yellow balls. If a ball is randomly drawn from the...

• Replies: 2
• Views: 109
07-24-2015, 12:29 PM
9. ### Book for stochastic processes

I need a good reference to learn these topics 1. Markov Chains in discrete time. 1.1. Classification of states, recurrence notions of...

• Replies: 4
• Views: 274
07-22-2015, 01:23 PM
10. ### Counting problem?

NOW SOLVED. SPECIAL THANKS TO rogojel and con-tester. This is probably a simple problem, but I have been through my 8 counting rules about different...

• Replies: 3
• Views: 108
07-22-2015, 10:55 AM
11. ### Random numbers

Hello, let me go direct to point: Let's say i have a total of 60 numbers (1-60) and i can generate 6 random numbers among them, in this case: 5,...

• Replies: 12
• Views: 550
07-22-2015, 08:00 AM
12. ### Binomial question?

I have this question that I think is binomial probability. Bananas that are almost ripe to pick carry the chance of being 15% rotten. What would be...

• Replies: 4
• Views: 390
07-21-2015, 12:32 PM
13. ### Poisson and binomial distributions

I composed this question: A hospital has 20 ambulances and on average 2 break down a day. There are five ambulances in reserve and if more then five...

• Replies: 2
• Views: 116
07-21-2015, 10:57 AM
14. ### Probabilistic models - clarification on separation of model and solver

Almost all of the material I read on probabilistic models/ probabilistic programming mentions separating solver and the model, thus stating the...

• Replies: 0
• Views: 87
07-20-2015, 08:38 AM
15. ### Calculating a stochastic matrix with multiple states

I am struggling with how to calculate the values of a Markov matrix which has multiple states. For example, Imagine an unfair 6 sided dice. The...

• Replies: 1
• Views: 258
BGM
07-14-2015, 11:02 AM
16. ### variance of a function of random variables

Hi all, I'm trying to calculate the variance of a function of two continuous random variables and could do with a nudge in the right direction...

• Replies: 1
• Views: 160
BGM
07-11-2015, 11:58 AM
17. ### Trying to calculate confidence intervals

Hi everyone. The numbers below are the annual maintenance costs of a program I am working on. I'd like to use the data set to estimate future costs...

• Replies: 2
• Views: 250
07-08-2015, 10:02 AM
18. ### Probabiilities help

The question I am trying to answer is: What is the probability of dealing three black cards from a standard deck when dealing them from a standard...

• Replies: 4
• Views: 286
07-05-2015, 05:22 PM
19. ### Probability Ideas in the monty Hall problem Stats class assignment help!

Watch a YouTube video that explains the problem: "Monty Hall Problem with Ron Clarke", this video starts with "Hello and welcome to the Monty Hall...

• Replies: 2
• Views: 357
06-30-2015, 04:48 PM

I have no idea how to solve this problem A survey of undergraduate calculus and physics students showed that 58% of them had donated blood at...

• Replies: 0
• Views: 243
06-29-2015, 05:32 PM
21. ### how to find MGF ?

E(X^r)=(r+1)!* (2^r). we have to find MGF of random variable X.

• Replies: 0
• Views: 81
06-29-2015, 02:38 PM

I am a 58 yr old Grandpa looking to see if there is Shananagan's are going on at my work. I want to find out the probability in this scenario. You...

• Replies: 2
• Views: 111
06-29-2015, 01:19 PM
23. ### Expected value of absolute value without replacement

I'm trying to figure something out for as a curiosity of mine, and I apparently can't remember enough of my college statistics class to solve it. If...

• Replies: 1
• Views: 79
06-29-2015, 11:31 AM
24. ### Crying inside 😖 just can't quite get probability

I'm taking stats online and this unit is on probability. I'm having a terrible time understanding it. The conditional probability rule is where I'm...

• Replies: 0
• Views: 175
06-29-2015, 03:03 AM
25. ### Mapping a pdf to peaky pdf

Hi All, From past few days I am trying to model this mapping function. I want to map a distribution(uniform/non-uniform) to a more peaky...

• Replies: 0
• Views: 175
06-27-2015, 12:44 PM
26. ### Analysis of Squash Match

I've been stuck on this problem for days. Any help, solutions or just pointers would be very welcome. A squash match is composed of a number of...

• Replies: 0
• Views: 208
pvm
06-25-2015, 07:32 AM
27. ### Non parametric distribution

Hello everyone, I have the following problem I could not solve (I published it before but it seem it did not get through. The authors is making a...

• Replies: 0
• Views: 18
06-21-2015, 07:39 PM
28. ### WANT Theoretical Probabilities theory books suggestion

Hello, I am reading a theoretical probability theory book " Probability Theory: The Logic of science " by E.T.Jaynes. But, this book is very advanced...

• Replies: 1
• Views: 265
06-21-2015, 01:50 AM
29. ### Probability of completing multiples of objects

Hey Guys! I'm struggling with a posed question about completing a set of objects and would really appreciate some direction. EX: There are 10...

• Replies: 3
• Views: 289
06-18-2015, 01:52 PM
30. ### Book recommendations for distributions?

Hi everyone, I'm relatively new to stats (have done two beginner courses on it), and I feel like I learn best when I have an engaging book by my...

• Replies: 2
• Views: 194
06-17-2015, 10:15 PM
31. ### Monty Hall with Bayes Theorem

hi, I just ran across a strange statement in the solution of the MH problem with Bayes as it is described here for instance...

• Replies: 0
• Views: 152
06-17-2015, 12:05 AM
32. ### Calculating observed probability

Can anyone point me towards the formula and extra reading I would need to calculate how many observations I would need to make in order to calculate...

• Replies: 3
• Views: 324
06-12-2015, 06:15 AM
33. ### hi every body

hi everybody I'm new here I'm doing a research I have a questionnaire with 3 scales positive neutral negative which i want to do statics using...

• Replies: 2
• Views: 293
06-11-2015, 09:21 AM
34. ### CHI^2 test for binomial variables which are not normally distributed

Hello, Assume that you have X_1\cdot X_n independant random variables. If they are normally distributed we can use the Chi^2 statistical test to...

• Replies: 0
• Views: 129
CBW
06-10-2015, 07:59 AM
35. ### Conditional density, bivariate normal

Let Z=X+Y where X \sim N(\mu,\sigma^2) and Y \sim N(0,1) are independent. What is the conditional density of X given Z, f_{X|Z}(x|z)? I already...

• Replies: 3
• Views: 213
06-10-2015, 05:51 AM
36. ### Probability Applications - Drawing from a Deck of Cards

Hi! I am having trouble figuring out how to go about solving the following problem: "Find the probability of obtaining the given 5-card poker...

• Replies: 1
• Views: 305
06-06-2015, 12:35 PM
37. ### What is the probability of not drawing a club from a deck of cards

Hi, Can someone help me with this please? You draw 40 playing cards, 1 at a time, with replacement from a standard deck. What is the probability...

• Replies: 2
• Views: 270
06-05-2015, 07:43 AM
38. ### Probability of solder ball inside a sealed package able to cause a failure

I have a hermetically sealed semiconductor package, NAND. And I have some foreign object debris (FOD), solder balls to be exact, inside this device....

• Replies: 0
• Views: 167
06-04-2015, 09:21 AM
39. ### Probability of default

What is the probability of default in 2 years? The probabilit of default year 1= 10% The probability of default year 2 = 10%

• Replies: 0
• Views: 124
06-04-2015, 02:03 AM
40. ### My program TARGETS

I used a Monte Carlo method of finding probabilities of collisions between a randomly tossed circular block and non-overlapping randomly placed...

• Replies: 0
• Views: 194
06-03-2015, 02:42 PM
41. ### Probability

This is not part of any homework, but an odd occurrence that happened within our family and I'd just like to find out what the chances/odds of this...

• Replies: 4
• Views: 378
05-29-2015, 09:54 PM
42. ### Generate simulation data with PDF and ACF

Dear I'am trying to model a wireless channel based on throughput measurements. I've processed the measurements and approximated the PDF of the...

• Replies: 4
• Views: 370
05-27-2015, 09:30 AM
43. ### Probability to win

Hello, I would like to calculate the probability to win 3 times in a lottery considering the following: 1 - the chance to win 1 time is 1 in...

• Replies: 11
• Views: 438
05-25-2015, 01:54 PM
44. ### probability of 8 successes out of 256 events

Hi all hope you are well, i was trying to calculate what the probability of getting exactly 8 successes in 256 events. I used a Binomial on line...

• Replies: 5
• Views: 413
05-25-2015, 06:12 AM
45. ### probability of choosing number

I have a question related to probability of choosing numbers. If there is 5 people picking numbers from 1 to 5, there is 5^5 ways to pick...

• Replies: 1
• Views: 221
05-25-2015, 05:47 AM
46. ### Bayes's Theorem

Hi! Say there is a deck of 100 cards: Red w/ numbers = 40 Red w/ figures=15 Black w/ numbers=35 Black w/ figures=10 The only information...

• Replies: 4
• Views: 292
05-23-2015, 03:22 AM
47. ### Probability definition

Hi stats guys, I had a heated discussion about the following situation today: Let’s say I have a function f(x) producing values between 0 and...

• Replies: 6
• Views: 265
BGM
05-22-2015, 10:40 AM
48. ### A little help

I know that a event with two outcomes such as making a three throw in basketball doesn't necessarily have a probability of 0.50, it could range...

• Replies: 1
• Views: 324
05-18-2015, 07:42 AM
49. ### Bayesian Convergence

I have to go to bed any minute, so I apologize for the lack of detail provided. I was thinking about repeated testing and how probabilities...

• Replies: 7
• Views: 420
05-13-2015, 03:26 AM
50. ### Combination of families of fragility curves (cumulative probability functions)

Hi guys, I am a geotechnical engineer and currently involved in a project for risk calculation of an embankment dam. It's my first post here, I am...

• Replies: 0
• Views: 242
05-11-2015, 09:42 AM
51. ### Probability on Roulette. Just curious!

Hello all. Could you help me? I have been discussing the following topic with my work teammates; We were talking about statistics and...

• Replies: 2
• Views: 305
05-11-2015, 09:26 AM
52. ### Probability of relations in a network

Imagine i have a predicate $friends(p_1, p_2)$ and I know that $p(friends(p_1, p_2)) = p_1$. If I generate a world of $n$ people, I expect there to...

• Replies: 0
• Views: 192
05-08-2015, 07:29 AM
53. ### Google Earth circles probability

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: 275
BGM
05-07-2015, 08:58 AM

Suppose you have a FIVE sided dice. One of the sides has a star on it, the other four sides are blank. Suppose you rolled it 10 times. What are the...

• Replies: 1
• Views: 200
05-06-2015, 08:38 PM

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