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Forum: Probability

Probability course and homework discussion. Probability distributions. Probability theory, stochastic processes

  1. Arrow Sticky Thread 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)...

    Started by quark‎, 09-30-2005 09:44 AM
    • Replies: 0
    • Views: 30,337
    09-30-2005, 09:44 AM Go to last post
  1. Question about 68-95-99.7 rule

    Suppose that 60% of all students at a large University access course information using the internet. There is a 68% chance that the sample...

    Started by JasonStats‎, 03-24-2010 06:06 PM
    • Replies: 1
    • Views: 5,419
    03-25-2010, 09:18 AM Go to last post
  2. Question about uncorrelated random variables that are not independent

    I understand that if random variables are uncorrelated, then Cov(X, Y) = 0 and Corr(X, Y) = 0 are among the 2 conditions. However, what is the...

    Started by StatStudent3‎, 12-07-2010 11:19 AM
    • Replies: 1
    • Views: 5,418
    12-07-2010, 11:26 AM Go to last post
  3. Conditional expectation question

    Hey, I would really appreciate your help with the following question: X and Y each has a uniform distribution on and the two are independent....

    Started by busstud123‎, 03-01-2010 12:10 PM
    • Replies: 8
    • Views: 5,417
    03-06-2010, 02:46 AM Go to last post
  4. Poisson and Geometric Random Variable questions

    Hi all, Can anyone tell me if I got the correct answers for the below two questions? Any help is appreciated. Q:Let X have a Poisson...

    Started by dizzle1518‎, 04-26-2011 08:11 PM
    • Replies: 6
    • Views: 5,412
    04-28-2011, 10:29 PM Go to last post
  5. Red face pmf and cdf setup

    I'm having trouble with the initial setup. Could you help me construct a probability mass function? A fair coin is tossed three times. A player...

    Started by linjen31‎, 01-28-2009 12:15 AM
    • Replies: 1
    • Views: 5,410
    01-28-2009, 03:46 AM Go to last post
  6. KENO probability

    "In the game of Keno, 80 numbers are displayed on a reader board. 20 of these numbers are chosen to be the winning numbers. Suppose a person has...

    Started by mlampingbhhs‎, 02-17-2006 01:49 PM
    • Replies: 3
    • Views: 5,405
    02-20-2006, 10:48 AM Go to last post
  7. Moment Generating Function

    Hi all, I'm supposed to find the MGF of the Gamma Distribution. Here is a link to my solution:...

    Started by jamesmartinn‎, 10-27-2010 11:57 PM
    • Replies: 3
    • Views: 5,404
    10-29-2010, 01:22 PM Go to last post
  8. Standard Deviation in Probability

    I'm having troubles with this probability question... The weights of apples in a large crate have a Normal distribution with μ = 138 grams and σ =...

    Started by girugamesh‎, 04-22-2009 11:03 PM
    • Replies: 3
    • Views: 5,394
    04-23-2009, 12:29 AM Go to last post
  9. multiple choice

    please help! if given multiple choice test with 10 questions and each having 5 choices, what is the prob of getting atleast one correct? also of...

    Started by jt72‎, 10-11-2005 08:43 PM
    • Replies: 1
    • Views: 5,388
    10-11-2005, 08:56 PM Go to last post
  10. Roulette & interesting binomial question

    Hi everyone, Since I have some mathematical knowledge my friend asked me to help him out with a question with which I'm struggling: "On a...

    Started by steve695‎, 02-07-2011 10:19 AM
    • Replies: 5
    • Views: 5,381
    02-08-2011, 06:07 AM Go to last post
  11. Sampling Distribution Question

    I have a couple questions here that I think I am doing correctly, just want some confirmation? Thanks! 1. Suppose that the final exam scores of a...

    Started by jz722‎, 02-09-2011 11:17 PM
    • Replies: 4
    • Views: 5,381
    02-12-2011, 12:22 AM Go to last post
  12. Smile Interesting but simple probability question (Black/White Marble)

    Hey guys, Its my first time posting in these forums. The other day a professor of mine gave me this problem which i tried to do for hours but...

    Started by v10‎, 12-09-2010 04:28 PM
    • Replies: 3
    • Views: 5,377
    12-09-2010, 11:00 PM Go to last post
  13. Binomial random variable question

    I have this question that is driving me batty & I cannot figure it out. I'm taking entry level stats online & have driven to the campus a few times...

    Started by disgurl‎, 06-16-2009 11:26 AM
    • Replies: 5
    • Views: 5,369
    06-16-2009, 09:34 PM Go to last post
  14. stupid question sample variance

    Hi there, I have a rather stupid question suppose I have the values of the random variable X: for example. (That's right the third...

    Started by leo nidas‎, 12-13-2008 08:13 AM
    • Replies: 13
    • Views: 5,367
    12-15-2008, 11:44 AM Go to last post
  15. im just stuck. pls help me

    You wish to open a new restaurant and are considering locations in Edmonton and St. Albert, but only one location will actually become ...

    Started by sweetx‎, 08-29-2006 10:34 PM
    • Replies: 6
    • Views: 5,365
    09-01-2006, 12:46 AM Go to last post
  16. Classical Probability and Relative Frequency Probability Approach

    As classical Probability uses mathematical formula for calculation and events are equally likely. As I know Binomial distribution is used for...

    Started by sachinner‎, 01-15-2013 10:11 AM
    • Replies: 0
    • Views: 5,365
    01-15-2013, 10:11 AM Go to last post
  17. Combining two dependant discrete random variables

    Hi, Iím looking for a way to combine two discrete random variables (which I have as probability distributions). The combination should be the...

    Started by simcc‎, 12-16-2011 03:38 AM
    • Replies: 1
    • Views: 5,354
    12-16-2011, 05:58 AM Go to last post
  18. Baye's Theorem Urn Problem

    Hi, I am having some trouble with this problem: Suppose there are 3 urns. You choose one from which you will choose 2 balls from. Urn 1 has 4 red...

    Started by mobius0‎, 07-09-2009 10:17 PM
    • Replies: 5
    • Views: 5,352
    07-11-2009, 10:44 AM Go to last post
  19. Help understanding Expectation of a sum

    Hi, I would like some help with understanding the properties of the expectation operator and the summation large sigma. Denote S as the large...

    Started by PeterVincent‎, 10-03-2007 03:33 PM
    • Replies: 2
    • Views: 5,349
    10-08-2007, 06:07 AM Go to last post
  20. How do you multiply a probability times a probability?

    Just a non-math guy needing help from some math guys so I can finish an article for a magazine! I know it's easy to do, I just don't know how. ...

    Started by cpaavola‎, 01-19-2010 09:38 PM
    • Replies: 10
    • Views: 5,348
    01-20-2010, 01:05 PM Go to last post
  21. 13 card straight - Calculation correct?

    Hello! I am trying to compute the Pr. of being dealt a 13 card straight out of a standard 52 card deck. (ie. 23456789TJQKA) Here's my...

    Started by datune‎, 03-05-2009 10:55 AM
    • Replies: 1
    • Views: 5,347
    03-14-2009, 01:38 PM Go to last post
  22. Need Help Please

    There is a group of 200 college students, 138 are taking psychology, 115 are taking sociology, and 91 are taking both. a.) How many of the...

    Started by Leper Messiah‎, 09-10-2006 09:24 PM
    • Replies: 4
    • Views: 5,346
    09-10-2006, 10:48 PM Go to last post
  23. correlation coefficient

    hi another exam preparation question: let x1..xn be random varibale independent and with same dist. they have exp. u and variance v. let m be a...

    Started by zhenyazh‎, 01-24-2010 07:12 AM
    • Replies: 2
    • Views: 5,343
    01-24-2010, 07:49 AM Go to last post
  24. Probability of an event after combining (Union) two sample spaces

    Can anybody help me how to solve the following problem. Suppose we have an event x and two sample spaces s1,s2. let the probability of x is 0.3, 0.4...

    Started by saleem‎, 06-23-2011 09:20 PM
    probability question
    • Replies: 9
    • Views: 5,339
    09-20-2012, 01:25 AM Go to last post
  25. Sampling distributions of estimates question?

    Hi there, I'm stuck on a question regarding the chap. in our course called: Sampling distributions of estimates. Here is the question: My thoughts...

    Started by SwatKats‎, 09-09-2010 07:20 AM
    • Replies: 3
    • Views: 5,338
    09-10-2010, 06:16 AM Go to last post
  26. Post Help with stats assignment

    An airline knows that 5 percent of the people making reservations on a certain flight will not show up. Consequently, their policy is to sell 52...

    Started by lvpfan‎, 01-25-2011 06:49 PM
    • Replies: 2
    • Views: 5,335
    01-26-2011, 12:13 AM Go to last post
  27. joint pmf of 2 dependent variables

    Hi, I am having trouble calculating the joint pmf of two "not necessarily independent" RV's. The information given was that X~Bernoulli(p),...

    Started by dm20‎, 12-12-2010 10:44 PM
    • Replies: 4
    • Views: 5,334
    12-13-2010, 12:27 AM Go to last post
  28. help with 2 PROBLEMS... THANKS!

    I could use help with these two problems please. 8. Ricardo's car rental offers five different types of vehicles, compact cars (CC), midsize cars...

    Started by waterdog32‎, 06-01-2008 05:04 PM
    • Replies: 3
    • Views: 5,330
    06-03-2008, 04:24 PM Go to last post
  29. True or false?

    Is this statement true or false? The central limit theorem says that, as n tends to infinity the distribution of (Y - E(Y))/Standard deviation...

    Started by Cookie‎, 08-23-2010 09:08 PM
    • Replies: 10
    • Views: 5,328
    08-24-2010, 11:26 PM Go to last post
  30. Discrete Distributions: Coin Toss

    Let X be the number of flips of a fair coin that are required to observe heads-tails on consecutive flips. a. Find the probability mass function...

    Started by xcowrnx‎, 04-12-2008 02:27 PM
    • Replies: 3
    • Views: 5,326
    04-13-2008, 08:07 PM Go to last post
  31. even and odd probability of coin

    hi, i am preparing for an exam and i wondered if some one could show me explicitly how to calculate the probability of getting an even number of...

    Started by zhenyazh‎, 01-24-2010 06:51 AM
    • Replies: 1
    • Views: 5,323
    01-24-2010, 08:02 AM Go to last post
  32. Interpreting meaning of predicted values when using a Generalized Linear Model

    Iím having trouble understanding what the predictions actually mean when using a Generalized Linear Model with e.g. a Poisson error distribution and...

    Started by Ilya Maclean‎, 04-04-2011 11:57 AM
    • Replies: 2
    • Views: 5,320
    04-04-2011, 12:30 PM Go to last post
  33. Batting Average & Probability

    A softball team's first 4 hitters are Sam (batting average .500), Gina (batting average .400), Tom (batting average .737), and Kerry (batting average...

    Started by smileysara2008‎, 02-26-2008 01:40 PM
    • Replies: 1
    • Views: 5,319
    02-26-2008, 01:43 PM Go to last post
  34. probabiliry problem under the conditional section

    Please help me to solve this. i dont know where to start. 1)Suppose that in Vancouver,B.C., the probability that a rainy fall day is followed by a...

    Started by i_like_maths‎, 02-20-2009 10:16 AM
    • Replies: 1
    • Views: 5,287
    02-20-2009, 11:12 AM Go to last post
  35. The Dice Game

    Hello everyone, I want to ask questions about my task. Below are the description. Thank you in advance. Kind regards, Kirman. The aim...

    Started by kirman‎, 02-18-2012 11:23 PM
    • Replies: 3
    • Views: 5,283
    02-19-2012, 01:38 PM Go to last post
  36. Please Help-binomial probability distribution, etc

    Wish I'd found your site a long time ago! I have been working on this all day long with no success and I don't know what to do. I am to...

    Started by SusanZ‎, 11-13-2005 07:31 PM
    • Replies: 2
    • Views: 5,277
    11-15-2005, 12:10 PM Go to last post
  37. help

    I can not figure this problem out! I don't think there is enough info, but there is an answer in the back: 0.271 The problem: Using Composite...

    Started by KobeLove08‎, 02-24-2008 11:00 PM
    • Replies: 2
    • Views: 5,276
    02-25-2008, 01:09 PM Go to last post
  38. problem so simple its confusing?? need help

    I need help with a homework problem. Because not all airline passengers show up for their reserved seat, an airline sells 125 tickets for a flight...

    Started by get5007‎, 10-05-2008 04:12 PM
    • Replies: 1
    • Views: 5,273
    10-05-2008, 04:18 PM Go to last post
  39. Industry-Wide safety factor of 4

    I want to hang a 10# picture on the wall so I carefully and slowly load the hanger with 40#. It doesn't fall. What can I say at this point about...

    Started by Outlier‎, 05-07-2010 02:54 PM
    • Replies: 6
    • Views: 5,265
    05-08-2010, 10:20 AM Go to last post
  40. Poisson Question! Please help!

    So the question is: A restaurant chef prepares a tossed salad containing, on average, 5 vegetables per day. Find the probability that the salad...

    Started by ankitj‎, 08-11-2009 09:19 AM
    • Replies: 3
    • Views: 5,263
    08-11-2009, 12:06 PM Go to last post
  41. identifying the distribution of a data set

    Dear all I am creating a software that is reading tcp packets from a link. I have the following information available: size of the packet: ...

    Started by alinaqvi90‎, 08-10-2006 09:47 PM
    • Replies: 4
    • Views: 5,257
    08-16-2006, 10:58 PM Go to last post
  42. Question Binomial and exponential distribution?

    Hi everyone. Could you help me with these two following problems: 1. A machine normally makes items of which 4% are defective. Every hour, the...

    Started by koala‎, 12-06-2010 10:30 PM
    • Replies: 1
    • Views: 5,255
    01-25-2011, 04:32 AM Go to last post
  43. Help with a hw question

    I am taking my first probability course and need some help. I am working on some homework. The question I am on now asks... Consider...

    Started by donkey‎, 12-01-2010 07:29 PM
    • Replies: 5
    • Views: 5,251
    12-04-2010, 12:51 PM Go to last post
  44. Three shooters, probability that two of them hits

    I have a little problem. There are three shooters ( i= 1,2,3) and they hit the target with probabilities P(A1) = 1/2, P(B1) = 2/3, P(A3) = 3/4....

    Started by 8Julio‎, 10-20-2011 01:26 PM
    • Replies: 14
    • Views: 5,247
    10-24-2011, 01:18 AM Go to last post
  45. probability and random processes with applications to signal processing Henry Stark

    Hi, I need this e book Probability and Random Processes with Applications to Signal Processing (3rd Edition) Henry Stark, John W. Woods. Has...

    Started by mkl‎, 09-27-2010 02:52 PM
    • Replies: 0
    • Views: 5,243
    09-27-2010, 02:52 PM Go to last post
  46. Probability/Counting Rules Help

    Hey: Would anyone know how to approach these two problems below? Many thanks in advance. A sales company purchases 15 new chars for its top...

    Started by skhan‎, 05-05-2006 09:44 PM
    • Replies: 2
    • Views: 5,242
    05-06-2006, 04:33 PM Go to last post
  47. need help

    hey kind people, i got some problems from my statistics assigment that i dont understand (couldnt get this 4 out of 15), so if you can give me...

    Started by alex19‎, 12-11-2006 02:00 AM
    • Replies: 2
    • Views: 5,239
    12-11-2006, 08:32 PM Go to last post
  48. Predicting probability with standard deviations, mean high and low values.

    I registered on this forum specifically to ask this question. This is not homework, it's simply a for fun/hobby problem I am trying to solve. This...

    Started by Cuda1337‎, 08-22-2012 04:59 PM
    • Replies: 5
    • Views: 5,238
    06-14-2013, 03:55 AM Go to last post
  49. probability--standard deviation question??

    A machine has been programmed to bore holes with a mean diameter = 0.15 mm and with a standard deviation = 0.005 mm. Parts will be rejected if the...

    Started by lmw‎, 10-18-2005 03:32 PM
    • Replies: 3
    • Views: 5,237
    10-18-2005, 07:39 PM Go to last post
  50. help with chi square freedom sums

    How do i show that the a + is a ? How can i use moment generating functions to do this?

    Started by omega‎, 11-25-2010 02:43 PM
    • Replies: 5
    • Views: 5,234
    11-25-2010, 10:12 PM Go to last post
  51. Expected Value of Convolution

    I am interested in estimating E where... - X ~ Normal(mu,sigma) - h(.) = CDF of Standard Normal distribution - g(.) = inverse CDF of Beta...

    Started by jcoull‎, 03-25-2013 02:35 PM
    convolution, expected value
    • Replies: 3
    • Views: 5,230
    03-28-2013, 10:21 AM Go to last post
  52. Thumbs down No clue when to use nCr or multiply the probabilites..

    I'm completely baffled as to when to use nCr or multiply the probabilites.. Here's an example.. Jane buys 5 jam donuts, 4 cream donuts and 3...

    Started by Gemmaaahhhh‎, 05-01-2012 01:48 PM
    help me!, ncr, probablity
    • Replies: 1
    • Views: 5,225
    05-01-2012, 02:41 PM Go to last post
  53. Expected Maximum for series of Poisson Distributions

    The problem I am working on is this: I have a detector which is an array of 4096 pixels. Each pixel receives an average of N counts. Since this is...

    Started by mickybob‎, 04-15-2010 10:11 AM
    • Replies: 3
    • Views: 5,221
    04-16-2010, 07:23 AM Go to last post
  54. simple proof of expected value...

    CV are random variables. Whats a hint to show if C<=V, then E(C)<=E(V)? my bad attempt if C<=V then P(C=s)<=p(V=s) for all s so summation of...

    Started by omega‎, 11-08-2010 06:17 PM
    • Replies: 6
    • Views: 5,220
    11-09-2010, 03:47 PM Go to last post
  55. Uniform Continuous Probability

    Hi all, The question i have has these givens: t = years f(t) = 10(1-5t) for 0=< t =< 1/5 a) What is probability that a machine will last...

    Started by c2q‎, 07-19-2010 09:02 PM
    • Replies: 5
    • Views: 5,213
    07-19-2010, 11:18 PM Go to last post
  56. Bayes Theorem Question

    Hello all, I have a homework question which I can not figure out: A stock market analyst examined the prospects of the shares of a large number...

    Started by furcal101‎, 09-22-2008 07:19 PM
    • Replies: 1
    • Views: 5,209
    09-22-2008, 11:42 PM Go to last post
  57. Poisson with events per week for calculating probability per Quarter?

    Hi all, I have a question regarding the Poisson distribution. (I searched the forum before creating this post, I couldn't find a similar post) ...

    Started by RayDaniel‎, 09-05-2008 06:29 AM
    • Replies: 4
    • Views: 5,206
    09-05-2008, 11:31 AM Go to last post
  58. Exam Question Probability.

    Pretty straightforward question, I just want to double check what I told a friend. She has 11 exam questions to study for, only 6 of these will be...

    Started by Cohen's monkey‎, 06-17-2008 09:19 PM
    • Replies: 3
    • Views: 5,203
    06-20-2008, 01:36 AM Go to last post
  59. Question about probability - roulette wheel

    Hi there, Have a question about the topic above. I spin a roulette wheel and wait until 31 of the 37 numbers have come up. I then cover the...

    Started by dhanwell‎, 02-09-2010 10:49 AM
    • Replies: 6
    • Views: 5,202
    02-09-2010, 01:23 PM Go to last post
  60. exponential distribution probability help

    This is a modified version of one of my homework questions. Please help me out, and show your work so I know how to calculate it myself. The only...

    Started by danthegolfer‎, 10-25-2009 06:45 PM
    • Replies: 3
    • Views: 5,191
    10-26-2009, 11:21 PM Go to last post

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