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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: 30,353
09-30-2005, 09:44 AM
1. ### okay need insight on this...

I have attempted to work this out twice use 2 different formulas (1.interval estimation of a population mean (small-sample case) 2. interval...

• Replies: 4
• Views: 3,546
08-22-2011, 06:56 AM
2. ### Need a Probability Answer

hello , i read a bit from the forum and i saw that i still do not have a answer to my propability question. The situation is like this How to...

• Replies: 8
• Views: 4,952
08-21-2011, 03:57 PM
3. ### Assignment Problem ((urgent))

Hey all. I am having some difficulty with one question on an assignment I have been workiing on. I am quite new to stats and I cannot find a...

• Replies: 4
• Views: 2,471
08-21-2011, 01:34 AM
4. ### a question with 3 different probablities

a baseball problem player A has a batting average of .350, player B as a BA of .184 and player C has a BA of .381. Making no adjustments for the...

• Replies: 3
• Views: 1,757
08-20-2011, 04:21 PM
5. ### Matching problem

I have bumped into some matching-type problems that seem to require some coding, unless someone can point out existing formulas or appropriate...

• Replies: 1
• Views: 1,302
BGM
08-17-2011, 02:55 PM
6. ### birthday coincidence

Hi, I'm wondering if anyone can help with something that's been puzzling my family for years. I have 3 sons, 2 from my first marriage and one from...

• Replies: 10
• Views: 2,747
08-17-2011, 02:24 PM
7. ### expected value

If y = -ax^2 + bx -c , what will be E( y ) and Var( y ) ?

• Replies: 0
• Views: 2,317
08-16-2011, 01:13 PM
8. ### Markov chain transition probability matrix

Hi there, I'm trying to understand markov chains and transition probability matrices. I have a recording of time (1, 2,, 3 second etc), velocity...

• Replies: 1
• Views: 3,019
08-16-2011, 12:00 PM
9. ### 90 Ball Bingo

In the traditional game of bingo there are 90 balls and each player gets a card with 15 of those 90 balls on arrange in 3 lines of 5. To match any...

• Replies: 0
• Views: 2,846
08-15-2011, 09:54 AM
10. ### Homework Problem- Normal Distribution/Standard Deviation

Hi there, I've been working through my homework problems and this one has totally stumped me in terms of where to start in order to complete the...

• Replies: 6
• Views: 5,839
08-14-2011, 07:40 AM
11. ### Probability Problem

Hi Everyone, I am wondering if I have the 5th, 25th, 50th, 75th, and 95th percentile values of 200 observations without knowing the standard...

• Replies: 2
• Views: 2,228
08-12-2011, 08:19 AM
12. ### no. of bombs required to destroy : question

please give me a clue for the following question.. There is 50% chance that any bomb may hit the target. Two direct hits are required to destroy...

• Replies: 2
• Views: 2,957
08-09-2011, 10:02 AM
13. ### Markov Chain

A Markov chain X_{n},n\geq 0 with states 0, 1, 2 has the transition probability matrix If P(X_{0}=0)=P(X_{0}=1)=\frac{1}{4}, find E How do...

• Replies: 5
• Views: 3,865
08-09-2011, 12:58 AM
14. ### Kind of unusual problem...

So this may seem sort of silly but was hoping I could get some help. I am not a very mathematical person but it has interested me a lot recently so...

• Replies: 4
• Views: 1,847
08-08-2011, 05:51 PM
15. ### Question

I'm working on a queueing problem and I have some kind of problem in calculating a probability distribution function. Suppose that we have three...

• Replies: 0
• Views: 1,642
08-08-2011, 05:22 PM
16. ### Conditional probability calculation

Please can someone help me with the following question: An urn contains 3 white, 6 red and 5 black balls. Six of these balls are randomly selected...

• Replies: 1
• Views: 7,454
BGM
08-08-2011, 11:16 AM
17. ### Markov Chain Question

Let P be the transition probability matrix of a Markov chain. Argue that if for some positive integer r, P^r has all positive entries, then so does...

• Replies: 2
• Views: 6,304
08-08-2011, 05:25 AM
18. ### Conditional Expectation problem

Consider n multinomial trials, where each trial independently results in outcome i with probability p_i,\sum_{i=1}^{k}p_{i}=1. With X_i equal to the...

• Replies: 2
• Views: 3,406
08-08-2011, 03:09 AM
19. ### Estimating a distribution

Hi, Suppose I had some bags containing a large number of black and white marbles. Each bag has a uniform distribution, but I don't know in advance...

• Replies: 12
• Views: 5,030
08-08-2011, 02:36 AM

if you have a trading system that is right 80% of the time and the risk/reward is 0.8/1 what is the probability of getting to breakeven in 50 trades?...

• Replies: 0
• Views: 1,519
08-07-2011, 03:55 PM
21. ### A large and powerful corporation is extorting money from the public.

When confronted with ****ing evidence the corporate CEO says these were rogue employees, these were anomalous cases, etc., etc., etc.. . . . ...

• Replies: 5
• Views: 2,433
08-07-2011, 09:47 AM
22. ### Estimating Conversion Rate When Data is Sparse

I'm a co-founder of a startup, and am seeking help with a statistical problem. I've been wracking my brains over this, and wondered if any of you...

• Replies: 0
• Views: 1,976
08-06-2011, 08:10 PM
23. ### Learning Probability Math

I’m reading a couple of works on probability, including “Probability Theory: The Logic of Science” by Jaynes. All of the math is over my head, and I...

• Replies: 6
• Views: 2,804
08-05-2011, 01:09 PM
24. ### permutation and combination

In how many ways 5 married couples are seated on Line, provided no person is next to his/her partner

• Replies: 1
• Views: 2,023
08-01-2011, 06:32 PM
25. ### Basic question about the normal distribution

So it seems like different distributions have different kinds of "experiments" associated with them, like how you use the binomial distribution when...

• Replies: 3
• Views: 2,154
07-31-2011, 02:31 AM
26. ### 2012 Presidential Election Probability Calculator

I'm trying to create a calculator to determine odds of Democrats winning the 2012 US Presidential election. I take the electoral college map from...

• Replies: 2
• Views: 4,226
07-31-2011, 02:25 AM
27. ### characterization of multivariate normal distribution by covariances

Hi, the professor told us that a multivariate normal distribution can be characterized as the only distribution for which zero covariance implies...

• Replies: 3
• Views: 3,619
07-30-2011, 06:50 AM
28. ### Question regarding Type II error probability

A researcher believes, on the basis of new data, that the height of a woman 20 years or older is greater than the published mean height of 62.9...

• Replies: 1
• Views: 3,166
07-30-2011, 06:16 AM
29. ### six digit no.

a no. of six digit is written down at random. the probability that the sum of the digit of the no. is even is

• Replies: 8
• Views: 3,228
BGM
07-30-2011, 03:15 AM
30. ### An application of optional sampling theorem to 1-D random walk

Hello all, I have a question about what wiki has to say about an application of optional sampling theorem to symmetric random walk: * Now...

• Replies: 2
• Views: 3,402
07-29-2011, 07:18 PM
31. ### how to determine there are less than 10% brown M&Ms

I am not sure where this question goes but I think this is the closest match. Say I have a big box of M&Ms and 20% of them are brown M&Ms. I break...

• Replies: 1
• Views: 1,944
07-29-2011, 10:31 AM
32. ### Probability Problem

Apologies if my terminology is bad, I haven't done any statistics for years. If this thread is posted in the wrong place, sorry I am new to this...

• Replies: 7
• Views: 2,480
BGM
07-28-2011, 11:46 PM
33. ### Chance of winning - question

Hi, I have not figured out how to solve the following questions: 1. Report the chance that Bears wins at least 6 games this year. 2. Compute...

• Replies: 2
• Views: 1,719
07-28-2011, 02:34 PM
34. ### Correlation of the product of 2 multivariate normal variables...

hello everyone! i've got a quick theoretical question that i'm gearing towards a simulation exercise but i need to get my stuff right first... ...

• Replies: 12
• Views: 5,977
07-28-2011, 01:33 AM
35. ### Card Game Probability Question!

The game is screw your neighbor! Four card players at a table. Two players have 1 chip two players have 2 chips. The player who gets delt the low...

• Replies: 1
• Views: 1,730
07-27-2011, 05:35 PM
36. ### Find expectation using conditioning

A coin, having probability p of coming up heads is successively flipped until at least one head and one tail have been flipped. (a)Find the expected...

• Replies: 2
• Views: 2,355
07-27-2011, 04:32 AM
37. ### Simple Question

Hi all, I got stuck with a simple question. Thanks in advance for your response. The question is: X_i 's follow i.i.d standard normal rvs. ...

• Replies: 11
• Views: 2,895
BGM
07-26-2011, 11:36 AM
38. ### Recurring Event, Probability of Totals

Hi. I'm actually not working on homework, but trying to make odds tables for a card game called Summoner Wars to practice/learn math for fun. ...

• Replies: 1
• Views: 5,171
BGM
07-25-2011, 11:53 PM
39. ### My answers to a revision paper

Hi, I was wondering if I could get some of these answers checked for me. The paper I am working from is here and I am attempting section A...

• Replies: 4
• Views: 3,680
07-25-2011, 11:25 AM
40. ### Sampling distribution of the proportion

I have a fairly simple question about a specific step within this problem. "The probability is 90% that the sample percentage is contained within...

• Replies: 2
• Views: 5,601
07-23-2011, 08:02 PM
41. ### Probability Question

Health public researcher checked data from a group of 937 men that died in 2009. The researcher found that 210 of the men died from heart related...

• Replies: 4
• Views: 2,582
07-22-2011, 02:39 PM
42. ### Combining multiple probabilities

Hi, Is it possible to add two or more probabilities together to get an overall probability? For example: There is a dichotomous outcome, let's...

• Replies: 1
• Views: 2,559
BGM
07-21-2011, 06:43 AM
43. ### Proof question

Using the identity: (^θ -θ) = + = + B(^θ) , Show that

• Replies: 1
• Views: 4,160
07-20-2011, 05:39 PM
44. ### normal distribution, use 50% probablity to get standard deviation

Hello, I have got a normal distribution with μ=0 and I know that 50% of all observations are within a certain range. How can I get the standard...

• Replies: 2
• Views: 6,070
07-19-2011, 11:56 AM
45. ### Basic probability

Whilst I've done pg stats (like 30+ years ago) and still use them a bit, I'm now wishing to look more closely at the basis of probability. With that...

• Replies: 0
• Views: 2,393
07-18-2011, 11:48 AM
46. ### Suppose there's two events, A & B, with P(A)=75% and P(B)=66%. Select all that apply

Hello, I'm having a lot of trouble with this homework question and I really need help figuring it out! Suppose there are threeevents, A, B, and C,...

• Replies: 1
• Views: 3,398
07-17-2011, 10:09 PM
47. ### expected gain

Let's say the price people are willing to pay for something is listed below, so 9 people are willing to pay 3 while only 1 is willing to pay 12. How...

• Replies: 6
• Views: 4,253
07-17-2011, 11:28 AM
48. ### brownian motion in stopping time

Hello everyone! I am stuck with a little problem concerning BM and stopping time. :( If we define tau_n:=inf{t>=0 : |W_t|>=n}, does anyone have...

• Replies: 6
• Views: 3,741
07-15-2011, 12:41 PM
49. ### Throwing a die 7 times

Hello, my problem is as follows: Throw a die 7 times. i) What is the probability that you get number 6 twice and all other numbers...

• Replies: 4
• Views: 2,638
07-10-2011, 06:19 AM
50. ### Covariance of random balls

Hi, would appreciate any comments: I have: 10 balls with number 6 on each, 10 balls with n. 7, 10 balls with n. 8. So it's 30 balls in...

• Replies: 2
• Views: 2,027
07-09-2011, 06:17 PM
51. ### exponential distribution: funtional system

Problem: The system is functional if all 3 of its components are in working condition. If lifetime of each components is distributed...

• Replies: 4
• Views: 4,284
07-09-2011, 12:08 PM
52. ### Can someone check if I did this right?

word problem: eight married couples are studying in a room. If four people are chosen at random, find the probability that: a) they are married...

• Replies: 1
• Views: 2,249
07-08-2011, 08:31 PM
53. ### Need help with understanding the synatx of Chebyshev

Hi guys HW Problem: Suppose X is a random variable with mean and variance both equal to 20. What can be said about P(0\leq X\leq 40)? ...

• Replies: 1
• Views: 2,594
07-08-2011, 05:37 PM
54. ### help: Finding number of tosses for an event.

Hello, I have a problem here which i understand but i am confused how to go about this. This is because our great teachers make us do everything...

• Replies: 3
• Views: 1,899
07-08-2011, 02:07 AM
55. ### Weird one....

Kindly help me in this one. What is the probability of a 2 yr storm (a storm occuring once in two years) to occur twice a year. Thanks

• Replies: 2
• Views: 1,944
07-07-2011, 11:51 AM
56. ### Small problem, calculating probability.

Ok so this was my problem on my last exam: NOTE that i am not asking you to solve this problem for me look bellow. Oke. I know how to solve...

• Replies: 9
• Views: 2,417
07-07-2011, 11:27 AM
57. ### Help me solve this probability question

The owner of a petrol station wished to determine the proportion of customers who use a credit card to pay at the pump. He surveyed 200 customers and...

• Replies: 2
• Views: 2,093
07-06-2011, 04:32 PM

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