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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: 30,331
    09-30-2005, 09:44 AM Go to last post
  1. Probability Question

    I was given 10 problems is my stats class and is having an issue with one. Can someone help me? Suppose n men throw their hats into a pile and...

    Started by tc11‎, 11-05-2008 08:54 PM
    • Replies: 4
    • Views: 2,600
    11-26-2008, 09:02 AM Go to last post
  2. random variables and variance

    if we let X be a (continous or discrete) random variable with range Rx how can we find Var(X)?? i dont have any clue plz help me. thx

    Started by xixihaha‎, 11-25-2008 03:08 PM
    • Replies: 4
    • Views: 3,627
    11-26-2008, 07:00 AM Go to last post
  3. Help. Have answer but teacher says wrong.

    A study of 500 pastors in the Baptist Church found that their sermons lasted an average of 20 minutes with a standard deviation of 3 minutes. If a...

    Started by Oasis‎, 12-08-2008 05:58 PM
    • Replies: 4
    • Views: 2,812
    12-09-2008, 03:03 PM Go to last post
  4. Moving window of Standard Deviation

    I'm not sure how best to phrase this, so please bear with me: I have a stochastic process from which I can measure one representative value per...

    Started by mosler‎, 12-24-2008 10:25 AM
    • Replies: 4
    • Views: 6,426
    12-30-2008, 07:56 PM Go to last post
  5. how many combinations ?

    4 numbers with each can be from 1 to 49. e.g. 1,2,3,4 1,2,3,5 1,2,3,6 1,2,3,7 but exclude depublication that is 2,1,3,4 or...

    Started by computeruser08‎, 01-29-2009 06:53 PM
    • Replies: 4
    • Views: 3,954
    01-29-2009, 10:02 PM Go to last post
  6. calculating expectation and variance

    Hi, I wanted to know if i'm on the right track with this problem. So far, for expectation I multiply 15/60 and 12. Not sure if this is correct....

    Started by Andiem‎, 02-01-2009 02:00 PM
    • Replies: 4
    • Views: 5,138
    02-01-2009, 02:17 PM Go to last post
  7. joint density, change of variables

    Need help with understanding. Two independent points dropped randomly on the interval. What is the density function of their distance x-y. I tried...

    Started by gekahelf‎, 02-02-2009 04:40 PM
    • Replies: 4
    • Views: 3,867
    02-05-2009, 10:38 AM Go to last post
  8. Help PLZ in probabilites

    Consider 4 machine components A,B,C and D with configuration as given below in a machine which produces text books. If each component is independent...

    Started by strongt‎, 02-08-2009 11:10 PM
    • Replies: 4
    • Views: 2,085
    02-08-2009, 11:54 PM Go to last post
  9. conditional expectation and variance

    Hi there, Suppose X~Exp(lam). We have a sample from X of size n. Knowing that the data follow the exponential diastribution, we fit the...

    Started by leo nidas‎, 02-09-2009 12:12 PM
    • Replies: 4
    • Views: 4,678
    02-09-2009, 01:54 PM Go to last post
  10. probability problem please help

    A college use two different textbooks during the last semester. During last semester 0.7 students used the text book by Professor B. and 0.3 students...

    Started by th3plan‎, 02-18-2009 12:04 AM
    • Replies: 4
    • Views: 4,799
    02-18-2009, 12:56 AM Go to last post
  11. normal distribution problem

    Question..?? I cant seem to get this right. Do I find the z-score then do the problem or... please help.. question The life span of oil-drilling...

    Started by SUNSHINE09‎, 02-28-2009 09:48 AM
    • Replies: 4
    • Views: 5,532
    03-01-2009, 11:28 AM Go to last post
  12. MLE for iid sample

    I am trying to find the MLE of theta where the pdf is f(x;theta)=theta.x^(n-1) and then show that its variance-->0 as n-->inf I have found the...

    Started by irateelf‎, 03-22-2009 03:57 AM
    • Replies: 4
    • Views: 3,634
    03-25-2009, 02:20 AM Go to last post
  13. random numbers vs dice

    Hi my stats knowledge is sufficient to think of this problem but insufficient to get the answer, and its annoying me! Assume I have 46656 base 6...

    Started by nick37‎, 12-26-2009 04:55 PM
    • Replies: 4
    • Views: 4,469
    12-28-2009, 12:30 AM Go to last post
  14. Poisson Distribution

    Hi all, it's me again! Just got a quick question here with the poisson distribution. Suppose messages arrive at a voice mail system according to a...

    Started by jamesmartinn‎, 04-03-2009 06:48 PM
    • Replies: 4
    • Views: 4,781
    04-06-2009, 10:23 AM Go to last post
  15. probability from moment generating function?

    if the moment generating of a random variable X is M_x(t)=(1-t)^-2 compute P(-2 < X < 3) or explain why it cannot be computed how do I do...

    Started by azazaz‎, 04-08-2009 08:14 AM
    • Replies: 4
    • Views: 6,571
    04-10-2009, 08:27 AM Go to last post
  16. Poisson. Calculate expected frequency problem.

    I've decided to brush up on my statistics recently by jumping right in the middle of it, and I landed on the normal distribution. I have this...

    Started by Cronos‎, 06-12-2009 07:06 AM
    • Replies: 4
    • Views: 10,357
    06-15-2009, 09:07 AM Go to last post
  17. probability and the normal curve

    I am in grad school getting a master's in education. I am currently enrolled in a stats class and I am not too good at math and definitely not stats....

    Started by PedroNotTheLion‎, 06-23-2009 10:28 PM
    • Replies: 4
    • Views: 4,910
    06-24-2009, 07:55 PM Go to last post
  18. Expected Value of pmf

    I am currently preparing for my upcoming actuary p/1 exam. The following question was in an book I am using:...

    Started by lovinash‎, 06-26-2009 02:15 AM
    • Replies: 4
    • Views: 11,966
    06-26-2009, 04:09 PM Go to last post
  19. Problem involving pdf

    Let X be the random variable which measures how long a light bulb lasts. If the probability density function of X is given by: f(X) = C/(x^3) ; x...

    Started by mobius0‎, 07-11-2009 03:26 PM
    • Replies: 4
    • Views: 2,125
    07-12-2009, 12:49 AM Go to last post
  20. Probability of events occuring at the same time?

    Hi! I'm having a bit of trouble calculating a probability as my statistics are a little bit rusty. Basically, I have 25 independant Wireless G...

    Started by thedash‎, 07-22-2009 02:39 PM
    • Replies: 4
    • Views: 5,903
    07-24-2009, 11:24 AM Go to last post
  21. Cool Need Solution Verified!

    Question: The income of junior executives in a large corporation are normally distributed with a standard deviation of $2000. A cutback is pending,...

    Started by canon14‎, 08-25-2009 06:38 AM
    • Replies: 4
    • Views: 2,796
    08-25-2009, 01:38 PM Go to last post
  22. Normal Distribution and Z-Score Help

    I am working on a problem and I am having problems with the z-score I calculate. The problem is: A baseball player's average distance is 180...

    Started by Jnak‎, 09-21-2009 02:42 PM
    • Replies: 4
    • Views: 4,032
    09-22-2009, 02:26 PM Go to last post
  23. Help, suspiciously common birthdate

    I have a database with 41469 medical practice patients. The patients have 22499 different (unique) dates of birth. Sorting by occurrence produces...

    Started by CharlesIsw‎, 09-21-2009 05:34 PM
    • Replies: 4
    • Views: 2,567
    09-27-2009, 02:23 AM Go to last post
  24. Probability in the Design of Social Games

    Hey all, I have a math major and in my free time I design online social games. Frequently in these games, players are divided into groups and often I...

    Started by SirSam972‎, 09-22-2009 12:01 AM
    • Replies: 4
    • Views: 3,122
    09-27-2009, 01:04 AM Go to last post
  25. conditional expected value #2

    I have two possibilities; X1 and X2. I set up a table: X2: 2: 0: -2 : X1: 0 : 0.1 0.2 0.1 -2: 0.0 0.3 0.3 Then I found: Px1(0)...

    Started by mandarine‎, 09-26-2009 05:54 AM
    • Replies: 4
    • Views: 2,971
    09-27-2009, 10:57 AM Go to last post
  26. probability problem

    I have a probability problem that is confusing me i think over a fine point taht i'm not getting. Here is the problem: a pizza with 8 slices,...

    Started by Stats Guy‎, 09-26-2009 02:45 PM
    • Replies: 4
    • Views: 2,347
    09-27-2009, 12:47 AM Go to last post
  27. Density function?

    Please can you help me solve this the pdf of continues r.v. X where f(x) {(2x 0≤x≤1 0 elsewhere} 1)...

    Started by zulkfal_1981‎, 10-04-2009 06:49 PM
    • Replies: 4
    • Views: 3,188
    10-05-2009, 04:09 PM Go to last post
  28. Exclamation Simple Probability Question... That I Don't Understand

    I am attempting to do some online homework but I'm stuck on the very first question. The first bit wasn't too hard to figure out (I merely multiplied...

    Started by teris‎, 10-04-2009 07:33 PM
    • Replies: 4
    • Views: 7,026
    10-04-2009, 08:48 PM Go to last post
  29. Simple probability question. Involves drawing name for gift.

    We had a dinner with my family where we draw names to give gift this christmas. The only rule was to not pick our name. We did it a couple of time...

    Started by moris7‎, 10-09-2009 09:02 AM
    • Replies: 4
    • Views: 5,514
    10-14-2009, 10:08 PM Go to last post
  30. probability problem

    Hi, i'm currently taking intro stats in college and I'm having trouble with probability questions. Here's one of the questions I'm working on: ...

    Started by dumbcollegestudent‎, 10-11-2009 10:39 PM
    • Replies: 4
    • Views: 2,401
    10-12-2009, 10:56 AM Go to last post
  31. Help!!! Normal distribution probability problem..

    I don't know if anyone asked similar question before, but the problem asks: The physical fitness of a patient is often measured by the patient’s...

    Started by puretopaz‎, 10-13-2009 09:38 PM
    • Replies: 4
    • Views: 5,433
    10-14-2009, 12:47 PM Go to last post
  32. Is a subset of a normal distribution normal?

    An easy one for some of you guys here I suspect. Thanks to anyone who can help me with it. I have an application which adds a normally...

    Started by bordonbert‎, 10-27-2009 10:39 AM
    • Replies: 4
    • Views: 10,342
    10-29-2009, 03:54 AM Go to last post
  33. law of total expectation (VECTOR case)

    " The law of total expectation is: E(Y) = E. It can be generalized to the vector case: E(Y) = E. Further extension: (i) E(Y|X1) = E (ii)...

    Started by kingwinner‎, 11-18-2009 02:53 AM
    • Replies: 4
    • Views: 5,608
    11-21-2009, 12:35 PM Go to last post
  34. Probability using z-table

    I'm studying for a final and working on some practice problems. I'm stumped on this one and would appreciate any and all help you can provide. The...

    Started by robbiesqp‎, 12-11-2009 05:20 PM
    • Replies: 4
    • Views: 6,101
    12-11-2009, 07:42 PM Go to last post
  35. Z scores .. please help

    there is two problems that i can answer .. 1) Processing of the ceramic alloy involves a sintering ( firing ) process which produces a dense hard...

    Started by paul2009‎, 01-03-2010 02:10 PM
    • Replies: 4
    • Views: 3,093
    01-06-2010, 02:00 PM Go to last post
  36. Verify type question

    Verify that if X ~ Poisson (mu1) independently of Y ~ Poisson (mu2), then the conditional distribution of X given that X + Y = n is Binomial on n...

    Started by jamesmartinn‎, 01-14-2010 05:10 PM
    • Replies: 4
    • Views: 3,012
    01-15-2010, 03:16 PM Go to last post
  37. Ratio of uniforms is Cauchy

    Hi all! I have U is uniform(0,1) and V is uniform(-1,1) such that U^2 + V^2 <= 1. Furthermore, let X=V/U. Show that X is Cauchy. I tried to...

    Started by JennySton‎, 02-16-2010 07:40 PM
    • Replies: 4
    • Views: 4,299
    02-17-2010, 02:21 PM Go to last post
  38. distribution of the range of N independent standard normal variables

    Let x1, x2, ... xn be independent standard normal variables. (standard normal: normal with 0 mean and variance 1). Let the range R be defined as...

    Started by AndyMC‎, 02-19-2010 08:49 AM
    • Replies: 4
    • Views: 7,446
    02-20-2010, 01:07 AM Go to last post
  39. Joint Density Function Question

    So (fy1,fy2) = e^-(y1 + y2) ) , for y1>0, y2>0 and 0 elsewhere. What is P(Y1 + Y2 < 3) The answer is .8009 I just can't work out how to get...

    Started by OToole‎, 02-21-2010 04:48 AM
    • Replies: 4
    • Views: 7,443
    02-21-2010, 08:52 AM Go to last post
  40. Random Variables and CDF

    The problem: A transmission channel is noisy and a binary bit (assume it is a 0 or a 1) has probability of .11 of being incorrectly transmitted. ...

    Started by swuster‎, 02-24-2010 12:49 AM
    • Replies: 4
    • Views: 4,366
    02-24-2010, 11:16 AM Go to last post
  41. Probability difficulties and Z scores

    I am currently grappling with this question: In a certain study the average age was 34.79 years. The SD of age was 14.78. What probability do...

    Started by Deganveran‎, 02-27-2010 05:36 PM
    • Replies: 4
    • Views: 3,828
    02-28-2010, 04:52 PM Go to last post
  42. Question How to calculate the number of samples?

    Our company receives wires which are manufactured to our spec in lot sizes that range between 2000 to 20000 wires at a time. These wires should be...

    Started by ffn884‎, 03-08-2010 11:24 AM
    • Replies: 4
    • Views: 9,628
    03-09-2010, 05:11 AM Go to last post
  43. Joint probability of random variables. Please help!!

    Three iid random variables, X, Y and Z with normally distribution with known mean and variances. If two pairs are made, X+Y and Y+Z then are they...

    Started by adnaniut‎, 03-11-2010 02:26 PM
    • Replies: 4
    • Views: 3,693
    05-08-2010, 03:41 AM Go to last post
  44. Machines fail randomly once a month on average.

    With one machine how long do I have to wait, on average, for a failure? I don't know when the last failure was. How long for the first failure...

    Started by Outlier‎, 03-14-2010 04:46 PM
    • Replies: 4
    • Views: 2,448
    03-15-2010, 09:55 AM Go to last post
  45. Probability problem

    An airline has 500 places for a flight. However, due to only 95% of reservations being taken the airline usually overbooks by 20 places. When the...

    Started by ryan90‎, 03-23-2010 09:15 AM
    • Replies: 4
    • Views: 3,126
    03-23-2010, 01:25 PM Go to last post
  46. Expected mean question

    Suppose that a random variable X has distribution given by P(X = x1) = a = 1 - P(X = x2), where a 2 and x1 != 0 and x2 != 0. (a) Find E i do...

    Started by pure_zero‎, 04-08-2010 02:55 AM
    • Replies: 4
    • Views: 3,552
    04-15-2010, 06:49 AM Go to last post
  47. Normal Distribution

    An individuals’ heights are normally distributed with mean 70 and standard deviation 3 (inches). a) What proportion of the population is...

    Started by SmileAli‎, 04-23-2010 05:16 PM
    • Replies: 4
    • Views: 10,982
    04-24-2010, 01:34 AM Go to last post
  48. Please help!

    thanks much for all ur help!!

    Started by probabilityguy‎, 04-26-2010 11:02 PM
    • Replies: 4
    • Views: 2,664
    06-19-2010, 12:55 AM Go to last post
  49. How do I add percentages?

    For instance, let's say a person is a truck driver and there's an: 80% chance of they smoke 40% chance of they are overweight 60% chance of they...

    Started by cpaavola‎, 04-30-2010 11:30 AM
    • Replies: 4
    • Views: 7,997
    05-03-2010, 11:15 AM Go to last post
  50. Simple probability question

    Test question: Assume that it is equally likely for a pregnancy to deliver a baby boy or a baby girl. Suppose that for a particular large...

    Started by jll6m‎, 05-05-2010 04:05 PM
    • Replies: 4
    • Views: 4,812
    05-06-2010, 12:25 PM Go to last post
  51. normal approximations

    One statistic used to assess professional golfers is driving accuracy, the percent of drives that land in the fairway. Driving accuracy for PGA...

    Started by natash‎, 06-17-2010 07:50 PM
    • Replies: 4
    • Views: 6,116
    06-18-2010, 05:05 PM Go to last post
  52. Probability for t=.0419, two independent samples, sample size 10?

    Using a student's t-Test, I've found a t-Statistic of .0419 for two independent samples of 10. My problem is getting the corresponding p-Value....

    Started by JoynerCN‎, 06-25-2010 09:04 AM
    • Replies: 4
    • Views: 3,035
    06-25-2010, 11:55 AM Go to last post
  53. Question Will rounding off Standard Deviation Bins cause error on Histogram?

    I am creating a Histogram. I have about 100 points of data and I am using MS Excel's Histogram function to create the "Bins". The data points I have...

    Started by andygarcia‎, 06-25-2010 10:04 AM
    • Replies: 4
    • Views: 6,733
    06-30-2010, 11:34 AM Go to last post
  54. A probability question

    52 cards, 13 values (A to K) and 4 suits. what's the probability of getting 5 cards with a four-of-a-kind (same value)? My solution: first card...

    Started by tennis89‎, 06-28-2010 12:08 PM
    • Replies: 4
    • Views: 2,675
    06-28-2010, 01:25 PM Go to last post
  55. Help

    an auther flips a coin 100 times in order to decide whether to use he or she in his book. If it's heads, he uses he. If it's tails, he uses she. What...

    Started by FailureAtStatistics‎, 06-29-2010 01:39 PM
    • Replies: 4
    • Views: 2,597
    07-11-2010, 08:53 AM Go to last post
  56. Weird Question

    Hello all! I have sort of a weird question / request. I'll be taking Mathematical Statistics I and II come Sept and I really want to brush up...

    Started by jamesmartinn‎, 07-08-2010 11:36 AM
    • Replies: 4
    • Views: 3,985
    07-08-2010, 09:18 PM Go to last post
  57. Transformations

    Hi! Suppose X ~ U(0,1). If we let Y = -ln (x) and then find the density of Y, we get the exponential distribution (with rate parameter = 1). ...

    Started by jamesmartinn‎, 07-12-2010 12:01 AM
    • Replies: 4
    • Views: 4,631
    07-12-2010, 03:28 PM Go to last post
  58. Discrete Random Variables

    Its asking to complete the chart. Since its probability I added it up to have a one but the other chart has a negative does that mean that it can't...

    Started by badatstats‎, 07-12-2010 08:30 PM
    • Replies: 4
    • Views: 3,291
    07-12-2010, 09:10 PM Go to last post
  59. Game Probability

    Hi All - I have not looked at statistics or probability for a number of years but am wondering if someone can provide me with a formula for figuring...

    Started by acas‎, 07-14-2010 08:58 AM
    • Replies: 4
    • Views: 4,080
    07-14-2010, 12:26 PM Go to last post
  60. technical VS biological replicates (compare means)

    Hi, I have conducted an experiment with an assay for 2 biological classes, each consisting of 10 unique members. I did the assay 3 times for a...

    Started by endocardium‎, 07-17-2010 11:54 PM
    • Replies: 4
    • Views: 14,060
    07-18-2010, 05:49 PM Go to last post

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