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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: 30,343
09-30-2005, 09:44 AM
1. ### Probability of a string containing a specific substring

So I've been getting into concepts like the Library of Babel and infinite monkey theorem, and have been trying to work out how to calculate the...

• Replies: 1
• Views: 6,690
01-18-2012, 11:22 AM

the time it takes for me to reach the university from my home has a normal distribution with mean 45 minutes and standard deviation 15 minutes. I...

• Replies: 8
• Views: 2,574
01-18-2012, 01:30 AM
3. ### Venn Diagram for Random Variables

Hi All, I was wondering whether it is possible to represent random variables in venn diagrams. As far as I've read, the distribution of...

• Replies: 2
• Views: 2,157
01-18-2012, 01:03 AM

An insurance company's records suggest that experienced drivers (those aged over 21) submit claims at a rate of 0.1 per year, and inexperienced...

• Replies: 13
• Views: 2,905
01-17-2012, 10:31 PM
5. ### Counting probability given the mean and standard deviation

Hi all :-) I'm trying to find solution to the following problem, could anyone please help ? In response to the increasing weight of airline...

• Replies: 3
• Views: 6,536
01-17-2012, 04:23 PM
6. ### Performance Function

What is performance function?

• Replies: 0
• Views: 1,075
01-16-2012, 10:24 PM
7. ### 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: 4,792
01-16-2012, 10:24 AM
8. ### gambling probability

Hi guys, hope someone can help... I would like to find out what the probability is of recieving a 2 or a 3 card '21' score from a single deck of...

• Replies: 1
• Views: 1,992
BGM
01-16-2012, 06:57 AM
9. ### Reverse order probability

There are 100 balls in a box: 50 red 20 blue 12 green 7 yellow 5 orange 3 purple 2 black 1 white.

• Replies: 1
• Views: 1,598
BGM
01-16-2012, 02:36 AM
10. ### pdf less than cdf

Let us consider the standard normal distribution. For most of the negative values the cdf is less than the pdf. eg. cdf(-1)=0.15 while pdf(-1)=0.24....

• Replies: 5
• Views: 2,750
01-13-2012, 01:58 PM
11. ### What distribution is this?

Hi, Looks like a nice forum here, hope you guys help me with this question, this is not a homework one since I am a coder, need to verify it for my...

• Replies: 8
• Views: 3,039
01-13-2012, 05:54 AM
12. ### almost sure convergence

Hi, I've got this question I'm trying solve for days already. Let Xn be random variable = 2 with prob 1/3 and = 1/2 with prob 2/3 Let Zn be...

• Replies: 5
• Views: 4,289
BGM
01-13-2012, 04:20 AM
13. ### probability that mean is less that

Hi everydoby, I have a data. Now I want ot find the probability that the weibull mean of this data is less that 10. does the result of...

• Replies: 0
• Views: 1,286
01-12-2012, 03:26 PM
14. ### Occurrence Probability

Hello..... Can anyone help me understand the occurrence probability? I am analyzing wind speed by frequency distribution, to do this I fitted wind...

• Replies: 2
• Views: 2,011
01-11-2012, 10:26 PM
15. ### Probabilities in a 7-game series

This probably isn't relevant, but this is not homework help. I'm just a curious adult who hasn't taken a stastics class in a few years so I'm pretty...

• Replies: 3
• Views: 5,102
01-11-2012, 03:36 PM
16. ### Joint cumulative distribution defined in a limited area

Dear all, Probably one of the classic problems but I can not get through it: F(x,y) = kxy for x + y <= 1, x >= 0, y >= 0 Assuming that...

• Replies: 2
• Views: 1,914
BGM
01-10-2012, 12:14 PM
17. ### Help! I’m baffled with a probability problem…..

Hi, Newby here. I am hoping someone on here can assist with a probability question that’s troubling me. I have three ‘events’, in each event...

• Replies: 4
• Views: 65,109
01-09-2012, 11:39 AM
18. ### Distribution of xy/z

Hi can someone please help me find the distribution for xy/z where x,y,z are uniform from 0 to 1 and independent. Having trouble with my set up...

• Replies: 4
• Views: 4,328
BGM
01-03-2012, 03:42 AM
19. ### Working out probability for this game

Rather confusing game ive started playing in the streets. I've been making alot of money from a game called high dice. A 6 sided dice is rolled...

• Replies: 2
• Views: 1,623
12-31-2011, 10:05 PM
20. ### 15 people (including you) apply for 7 jobs. What are your chances of getting the job?

Hi :wave: Allow me to extend my thanks to you all for taking the time to visit this thread. I came across this seemingly simple probability...

• Replies: 16
• Views: 7,251
12-30-2011, 02:39 PM
21. ### stochastic process distribution vs. distributions of subcollections

Hello, I am looking for a reason why the following would be true: Suppose Y = { Y_t : t = 0, +- 1, +- 2, ... } is a stochastic process. The...

• Replies: 0
• Views: 1,905
12-30-2011, 08:51 AM
22. ### Sum of 3 independent uniform distributon

Hi, Can someone please help me solve the following problem Y = X1 + X2 + X3 Xi ~ Uniform(0,1) independent i = 1, 2 3 I need to find...

• Replies: 2
• Views: 6,073
BGM
12-30-2011, 12:29 AM
23. ### Probability

The average life of a battery is normally distributed with a mean of 320 hours and a standard deviation of 20hours; what is the probability that the...

• Replies: 1
• Views: 1,481
12-29-2011, 07:19 AM
24. ### A coin thrown probability question

Hi all I could not explain this question by using "the product rule for independent events" - A coin is thrown four times. What is the probility...

• Replies: 2
• Views: 1,938
12-27-2011, 11:03 AM
25. ### What is the number of combinations for a 6XN combination lock?

Hi, does anyone know how to calculate the total number of combinations a 6XN combination lock .i.e. each of the 6 wheel columns has N possible...

• Replies: 5
• Views: 1,909
12-26-2011, 02:02 PM
26. ### calculate the probability of accident.

Suppose there are seven(distinct) accident occurs in a week. What is the probability that all accidents are occurred on the same day? Pls explain in...

• Replies: 6
• Views: 5,725
12-25-2011, 06:15 PM
27. ### Probability on a Multiple Choice exam

Hello, I am not very good at this type of stuff. I thought up something and I was wondering if someone can look over it and tell me if my...

• Replies: 18
• Views: 22,941
12-25-2011, 07:07 AM
28. ### Markov Chain probabilities

I have an example that is solved on one of the pages of wikipedia related to markov chains. I want to know how the probabilities (in bold) are...

• Replies: 1
• Views: 2,323
BGM
12-25-2011, 03:08 AM
29. ### Converting instantaneous Reliability at time (t) to normalized failure rate (fpmh)

Given the reliability at 2100 hours =0.992, then lambda(2100 hours) = -Ln(0.992)=0.008. I need to convert the hazard rate (lambda) for 2100 hours to...

• Replies: 3
• Views: 3,901
BGM
12-22-2011, 02:13 PM
30. ### Conditional Expectation Problem

Hi everyone, I have the following problem to solve and I would appreciate if someone could give me a hint on how to tackle it. Thank you in...

• Replies: 3
• Views: 1,904
BGM
12-22-2011, 01:55 PM
31. ### Help summing probabilities

Hi all, I am trying to figure out a way to use probability to estimate the number of customers my business is likely to see again in the future...

• Replies: 0
• Views: 1,299
12-19-2011, 11:59 PM
32. ### Urgent help needed - what is the probability that a student owns both a car and cell?

Hi, I am taking an introductory STAT course at UMN. I can't for the love of anything figure out the probability. Here's the question: Suppose...

• Replies: 1
• Views: 1,528
12-18-2011, 03:17 PM
33. ### Simple combinatorics

Hi, Just want to check if what i did is correct: A bridge club has 12 members (6 married couples). Four members are randomly selected to form...

• Replies: 1
• Views: 1,872
BGM
12-18-2011, 12:08 PM
34. ### instrument error

A machine turns out bearings with a radius of 1.0 and a few random samples now show an average of 1.001 with an SD of 0.003. If I want to check...

• Replies: 2
• Views: 1,612
12-17-2011, 02:17 PM
35. ### A random variable that is a mix of discrete and continuous

Here's a question we got for homework: It is given that at a certain bank there's 50-50 chance that when you enter there's: - no one waiting...

• Replies: 1
• Views: 2,087
BGM
12-17-2011, 10:58 AM
36. ### π-system and monotone class

Assume P is a π-system (that is, P is closed under finite intersections) and M is monotone class (that is M is a non-empty collection of subsets of Ω...

• Replies: 3
• Views: 131,911
BGM
12-17-2011, 10:54 AM
37. ### sigma -fieled

Let X : \Omega \rightarrow R and F be a class of subsets of R. show \sigma(X^{-1} (F))=X^{-1}(\sigma(F)) where X^{-1} (F)={X^{-1} (A):A\in F}

• Replies: 2
• Views: 2,848
BGM
12-16-2011, 01:25 PM
38. ### Its easy for you pros, but i need help anyways!

I have a simple stats/probability question. I need a formula to calculate probability of death. Lets say 20% of people with cancer will die this...

• Replies: 5
• Views: 2,196
BGM
12-16-2011, 11:23 AM
39. ### How to find std. dev. of Probability Distribution using Excel? Help please.

Hello, I can find the Population std. dev. using the formula and my BAII plus calc, but would like to know how to find the same using an Excel...

• Replies: 1
• Views: 11,186
BGM
12-15-2011, 02:26 PM
40. ### (Simple?) probability question...

Three coins. One is fair; one is two-headed; one is two-tailed. We pick a coin at random, flip it, and it comes out heads. The probability that...

• Replies: 7
• Views: 2,374
12-15-2011, 12:05 PM
41. ### How to prove that the unconditional MLE from a matched pair model is inconsistent?

for beta, the log odds ratio. The usual version that we seen using conditional likelihood is log(n_01/n_10) Thanks so much. any hint is...

• Replies: 3
• Views: 2,427
12-14-2011, 08:24 PM
42. ### Random Variable X

So this question is on my practice final, and the professor provided the work for how to solve it and I cannot figure it out. Suppose that the...

• Replies: 14
• Views: 6,569
12-13-2011, 09:03 PM
43. ### Joint distribution from marginals (unknown conditional) distributions

Hi, This is my first post in this forum; I hope someone can help me with this --thanks in advance for reading! I'm trying to find the joint...

• Replies: 1
• Views: 1,840
12-13-2011, 12:51 PM

I have to test for significance at the .05 level. The data given is a table with Drug Use and Death Penalty Support. The values are: Yes to Drug Use...

• Replies: 3
• Views: 2,322
12-13-2011, 12:37 PM
45. ### Probability of getting different results when tossing a coin

Here's a question I got for homework: Here's what I have so far: In every round (time unit) the possible results and so Which means we're...

• Replies: 3
• Views: 1,640
BGM
12-12-2011, 11:57 AM
46. ### The minimum of two independent geometric random variables...

Hi there, here's a question I got for homework (sorry if my translation is a bit unclear): I have no idea where to start, even with the great...

• Replies: 1
• Views: 3,267
BGM
12-12-2011, 08:06 AM
47. ### Probability of next new product not failing after history several failed products

What is the equation for finding the probability of a new product given 5 previous new products failed? What is the equation for finding the...

• Replies: 0
• Views: 1,802
12-10-2011, 09:32 PM
48. ### distribution help

I am just completely failed my online test and my teacher is letting me retake this 20 point question to try and pass...if anybody can help me out I...

• Replies: 4
• Views: 1,816
BGM
12-10-2011, 03:28 PM
49. ### Hypotheses Testing and Statistical Signifigance

The problem says, School district scores on a standard IQ test are normally distributed with a mean of 102 and a standard deviation of 12. A...

• Replies: 1
• Views: 1,390
12-10-2011, 12:10 AM
50. ### Poker question

From a deck of 52 cards, if you pick 3 cards how often will you have a pair but not three of a kind? I'm having a hard time setting this problem...

• Replies: 0
• Views: 890
12-09-2011, 03:22 PM
51. ### Poisson Approximation

A sequence of N triples of balls are randomly and independently placed into one of 100 boxes. Each triple of balls consists of a red, white and blue...

• Replies: 2
• Views: 1,770
12-09-2011, 09:03 AM

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