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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: 31,080
09-30-2005, 09:44 AM
1. 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: 6,841
07-27-2015, 09:48 AM
2. 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: 1,833
07-26-2015, 06:58 AM
3. 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: 1,145
07-24-2015, 12:29 PM
4. 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: 1,660
07-22-2015, 01:23 PM
5. 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: 1,664
07-22-2015, 10:55 AM
6. 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: 2,576
07-22-2015, 08:00 AM
7. 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: 1,699
07-21-2015, 12:32 PM
8. 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: 1,209
07-21-2015, 10:57 AM
9. 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: 1,017
07-20-2015, 08:38 AM
10. 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: 1,255
BGM
07-14-2015, 11:02 AM
11. 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: 1,762
BGM
07-11-2015, 11:58 AM
12. 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: 2,205
07-08-2015, 10:02 AM
13. 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: 2,324
07-05-2015, 05:22 PM
14. 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: 2,912
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: 3,269
06-29-2015, 05:32 PM
16. how to find MGF ?

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

• Replies: 0
• Views: 1,962
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: 1,466
06-29-2015, 01:19 PM
18. 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: 2,455
06-29-2015, 11:31 AM
19. 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: 20,382
06-29-2015, 03:03 AM
20. 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: 1,137
06-27-2015, 12:44 PM
21. 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: 1,848
pvm
06-25-2015, 07:32 AM
22. 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: 968
06-21-2015, 07:39 PM
23. 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: 1,397
06-21-2015, 01:50 AM
24. 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: 1,508
06-18-2015, 01:52 PM
25. 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: 1,444
06-17-2015, 10:15 PM
26. 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: 1,412
06-17-2015, 12:05 AM
27. 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: 3,072
06-12-2015, 06:15 AM
28. 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: 1,947
06-11-2015, 09:21 AM
29. 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: 953
CBW
06-10-2015, 07:59 AM
30. 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: 1,453
06-10-2015, 05:51 AM
31. 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: 1,370
06-06-2015, 12:35 PM
32. 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: 2,367
06-05-2015, 07:43 AM
33. 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: 899
06-04-2015, 09:21 AM
34. 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: 878
06-04-2015, 02:03 AM
35. 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: 868
06-03-2015, 02:42 PM
36. 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: 1,819
05-29-2015, 09:54 PM
37. 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: 1,606
05-27-2015, 09:30 AM
38. 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: 1,665
05-25-2015, 01:54 PM
39. 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: 1,592
05-25-2015, 06:12 AM
40. 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: 1,019
05-25-2015, 05:47 AM
41. 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: 1,656
05-23-2015, 03:22 AM
42. 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: 1,300
BGM
05-22-2015, 10:40 AM
43. 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: 1,244
05-18-2015, 07:42 AM
44. 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: 1,914
05-13-2015, 03:26 AM
45. 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: 1,704
05-11-2015, 09:42 AM
46. 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: 1,195
05-11-2015, 09:26 AM
47. 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: 999
05-08-2015, 07:29 AM

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: 1,254
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: 1,346
05-06-2015, 08:38 PM
50. Simple concrete example of Wold theorem?

I'm reading the Wold decomposition theorem for time series in http://faculty.chicagobooth.edu/john.cochrane/research/papers/time_series_book.pdf. ...

• Replies: 0
• Views: 1,077
04-29-2015, 10:25 PM
51. Probabilities and Monte-Carlo simulations - How to rank?

I'm not that statistically clued up within this particular area but it's an issue I am facing for work (bizarrely) and am having trouble of working...

• Replies: 8
• Views: 2,733
04-28-2015, 10:45 AM
52. Poll: A probability problem

Hi all, I would like to solve the problem bellow. To some it might seem to eassy. However i would appreciate some hints. Thanks in advance ... ...

• Replies: 7
• Views: 2,913
04-26-2015, 04:51 PM
53. Compound Probability

Hey guys, i am having a bit of trouble with this basic probability question which shows that i do not understand the basics at all. The question...

• Replies: 4
• Views: 1,514
04-26-2015, 10:01 AM

Hello probabilitygeniuses I am very new to probabilities and would like to ask if there are online resources with loads of probability...

• Replies: 5
• Views: 2,497
04-26-2015, 09:29 AM

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