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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: 30,178
    09-30-2005, 09:44 AM Go to last post
  1. discrete random variable and determine its characteristic function

    Let Xn be a discrete random variable that takes the values 1,2, . ...... n with equal probability. Evaluate the probability generating function of Xn...

    Started by noel_gallagher‎, 05-21-2008 04:48 PM
    • Replies: 0
    • Views: 3,554
    05-21-2008, 04:48 PM Go to last post
  2. Joint probabillity density function

    Hi I have posted this question on another site as i am new to this one and did not know how to include a formula (plus this question is unlike my...

    Started by noel_gallagher‎, 05-20-2008 10:19 PM
    • Replies: 2
    • Views: 2,346
    05-21-2008, 04:44 PM Go to last post
  3. probability

    Here is the question: After researching tumours of a particular type, a doctor at Princess Margaret Hospital learns that out of 10,000 such tumours...

    Started by roter789‎, 05-14-2008 12:39 AM
    • Replies: 2
    • Views: 2,525
    05-20-2008, 09:21 PM Go to last post
  4. Probability that a number in a group of numbers to be less than the average of group

    Hi, I am new to probability and would like to know how to find the probability that a number in a group of numbers is less than the average of that...

    Started by amanjsingh‎, 05-19-2008 06:05 PM
    • Replies: 2
    • Views: 4,780
    05-19-2008, 07:12 PM Go to last post
  5. probability problem

    A bag contains X quarters and Y dimes. Since quarters are bigger, any given quarter is twice as likely to be picked as any given dime. You pick Z...

    Started by fschmidt‎, 05-16-2008 12:31 AM
    • Replies: 1
    • Views: 2,243
    05-19-2008, 05:03 AM Go to last post
  6. Poisson Mean

    Hello Everyone, Im not sure if i posted at the right section if not im extending my apologies in advance. Ive been reading this network...

    Started by cincity‎, 05-19-2008 12:24 AM
    • Replies: 0
    • Views: 2,180
    05-19-2008, 12:24 AM Go to last post
  7. Probability

    Need help with this probability The probability that a student has a Visa card (event V) is .70. The probability that a student has a MasterCard...

    Started by Slick‎, 05-17-2008 01:24 PM
    • Replies: 1
    • Views: 2,462
    05-18-2008, 03:12 PM Go to last post
  8. Probability Problems

    Hello can someone verify if I am correct for these problems? A small package of alphabet soup noodles contain 3 As, 3 Bs and 3 Cs. You...

    Started by BaineHallow‎, 05-14-2008 06:04 PM
    • Replies: 1
    • Views: 2,934
    05-15-2008, 06:57 PM Go to last post
  9. Red face Determining Joint PDFs, and Marginal PDFs

    Hi All, I'm going through revision questions, and I am stuck on this particular section all with similar questions. If somebody can give me a guide...

    Started by woody198403‎, 05-09-2008 02:50 AM
    • Replies: 13
    • Views: 12,851
    05-15-2008, 01:04 AM Go to last post
  10. Exclamation scrabble probability =]

    if im the first to draw all 7 SCRABBLE tiles what is the probabiltiy ill get an X and J? another question: what is the probabilty ill get...

    Started by blargh‎, 05-14-2008 06:34 PM
    • Replies: 1
    • Views: 4,910
    05-14-2008, 09:05 PM Go to last post
  11. Smile PDF and E(Y)

    Hi All, I'm going through revision questions, and I am stuck on this particular section all with similar questions. If somebody can give me a guide...

    Started by woody198403‎, 05-09-2008 02:40 AM
    • Replies: 8
    • Views: 5,440
    05-14-2008, 07:03 AM Go to last post
  12. Finding Dist. Function in the form Y= aX+b

    Hi There, I havent actually attempted this question yet, but if anybody can provide me with a guide to answering it I'd be really greatful. Let X...

    Started by woody198403‎, 05-09-2008 02:36 AM
    • Replies: 5
    • Views: 8,544
    05-14-2008, 06:33 AM Go to last post
  13. quadtrat counts

    hi, maybe someone can help with the following problem: i counted quadrat of a grid with or without incidents. the grid covered a periphery area...

    Started by gimoya25‎, 05-13-2008 11:09 AM
    • Replies: 4
    • Views: 2,733
    05-14-2008, 03:43 AM Go to last post
  14. conditional probability problem

    can anyone give hint? if i apply the usual conditional probability rule what i get, for the 1st one say, is f(sigma_theta^2, sigma^2, mu, theta,...

    Started by dwen‎, 05-13-2008 09:28 PM
    • Replies: 0
    • Views: 2,095
    05-13-2008, 09:28 PM Go to last post
  15. Arrow Probability

    Let A and B be constants such that A < B. Let z be a standard normal random variable. For what values of A does P(A<z<B)approximately equal P(z<B)?...

    Started by encircleme‎, 05-09-2008 11:08 PM
    • Replies: 5
    • Views: 2,486
    05-10-2008, 03:18 PM Go to last post
  16. Question probability proof help

    Hi, I need to prove the following argument , can anyone help? Let A={a1,a2,...am} and B={b1,b2,...bn} are 2 group of random variables. ...

    Started by wu7up‎, 05-07-2008 11:54 AM
    • Replies: 6
    • Views: 2,580
    05-10-2008, 08:27 AM Go to last post
  17. Exclamation Exam Question. Conditional Prob and Dist Functions

    Hi Everyone. I was hoping somebody could help me with this question. I think i have confused myself to a point where I am just lost on it. X...

    Started by woody198403‎, 05-09-2008 02:16 AM
    • Replies: 3
    • Views: 4,123
    05-09-2008, 06:11 PM Go to last post
  18. chess probability question

    Hello, This question is taken from Ross' a first course in probability chapter 2. It is question 17. Here it is: If 8 rooks are randomly...

    Started by dmdmdm678‎, 05-04-2008 05:17 PM
    • Replies: 4
    • Views: 8,639
    05-06-2008, 12:28 PM Go to last post
  19. Unconditional distribution of X, a binomial random variable

    disregard..

    Started by Valdemar21‎, 05-05-2008 10:11 PM
    • Replies: 0
    • Views: 3,103
    05-05-2008, 10:11 PM Go to last post
  20. Four-Sided Die Question

    Consider the trial on which a 4 is first observed in successive rolls of a four-sided die. Let A be the event that 4 is observed on the first trial....

    Started by xcowrnx‎, 03-12-2008 01:47 PM
    • Replies: 4
    • Views: 4,946
    05-05-2008, 01:12 PM Go to last post
  21. Homework Help

    I am not sure where to begin or what to do with the below question. Any help would be ace. Cheers. Suppose that fifty people are to be given a...

    Started by statsdud‎, 04-27-2008 07:28 AM
    • Replies: 6
    • Views: 5,384
    05-01-2008, 10:48 PM Go to last post
  22. The probability of a rise or fall in blood pressure??

    I have developed a database program that searches for all blood pressure readings that are similar to the readings of any given patient. The program...

    Started by LaurieThompson‎, 04-28-2008 01:49 PM
    • Replies: 1
    • Views: 2,481
    04-28-2008, 03:21 PM Go to last post
  23. Quality estimation of one and an entire set of elements

    Suppose that I have a set of 10000 elements to buy/sell; I want to do some quality assurance activity in order to avoid to buy/sell invalid elements....

    Started by Marione‎, 04-28-2008 03:55 AM
    • Replies: 0
    • Views: 2,314
    04-28-2008, 03:55 AM Go to last post
  24. Talking URGENT Probability Q

    20% of private dwellings are fully owned by their residents (not under mortgage). In a group of 500 properties find the probability that at least 115...

    Started by Fifi‎, 04-27-2008 05:54 AM
    • Replies: 1
    • Views: 2,220
    04-27-2008, 10:26 PM Go to last post
  25. probability problem.. help?

    I have a question using the uniform probability where c=4 and d=10 Find k where P(2≤X≤k)=0.6 so (k-2)(1/6)=0.6 k-2=1 k=3 correct? TIA!

    Started by baby2k1‎, 04-27-2008 02:28 AM
    • Replies: 1
    • Views: 4,880
    04-27-2008, 10:23 PM Go to last post
  26. Probability help

    An investment offers the chances of various returns for each of 3 years as follows- Year Return- $30,000 $40,000 1 ...

    Started by lesgriffith‎, 04-27-2008 05:35 AM
    • Replies: 0
    • Views: 2,409
    04-27-2008, 05:35 AM Go to last post
  27. Need Extreme Help!!!

    Here is the problem I am having trouble with. A tire company finds the lifespan for one brand of its tires is normally distributed with a mean of...

    Started by ryanl‎, 04-26-2008 12:40 PM
    • Replies: 2
    • Views: 4,450
    04-26-2008, 07:44 PM Go to last post
  28. Exclamation Please help I solved this problem but the answers seem unlikely

    Please look over this problem I have solved it but the answers I have gotten seem unlikely. If they are correct please let me know otherwise please...

    Started by Mystika‎, 04-26-2008 06:24 AM
    • Replies: 0
    • Views: 2,299
    04-26-2008, 06:24 AM Go to last post
  29. Please help I need the formula to solve this problem

    Help please I am completely lost on this problem could someone help me by explaining what formula to use? Once I have a formula I should be able to...

    Started by Mystika‎, 04-26-2008 03:29 AM
    • Replies: 0
    • Views: 2,247
    04-26-2008, 03:29 AM Go to last post
  30. birth defects - probability

    I am new and really stuck with this one: Analyzing cases of a rare congenital defect>>>>>>>>>>>>> 1 female in 30 in the population carries the...

    Started by free‎, 04-22-2008 03:54 AM
    • Replies: 3
    • Views: 5,802
    04-25-2008, 01:26 PM Go to last post
  31. Need help asap with probability qusetion please

    Mechanico *** produce many different specialist components for industry. One such component that is made are pipe sections used in commercial...

    Started by tim_e‎, 04-23-2008 09:34 PM
    • Replies: 0
    • Views: 2,030
    04-23-2008, 09:34 PM Go to last post
  32. Percentage overlap of two gaussian distributions

    I would like to know how to calculate the overlap between two one dimensional gaussian distributions. Here is my approach: 1) Find the point, x*,...

    Started by tuesday‎, 04-23-2008 07:15 PM
    • Replies: 0
    • Views: 5,902
    04-23-2008, 07:15 PM Go to last post
  33. Exclamation Prob of happening by chance

    Say I have 1000 balls. 50% are blue, 50% are red. Someone trys to convince me they can pick red balls from the bag without looking at the balls. ...

    Started by Adam‎, 04-08-2008 07:02 PM
    • Replies: 9
    • Views: 4,438
    04-22-2008, 09:16 PM Go to last post
  34. Z test

    Hi , i have a question regarding z test and testing at 5% level. If sample size is 60 S=11.7 X=42.8 and i use formula Z= X-mu ...

    Started by el1‎, 04-22-2008 06:11 PM
    • Replies: 3
    • Views: 1,891
    04-22-2008, 07:06 PM Go to last post
  35. Joint density function

    This is from Exercise 5.26 from Mathematical Statistics with Applications v6. f (y1, y2) = {2, 0 <= y1 <= 1, 0 <= y2 <= 1, 0 <= y1 + y2 <= 1 ...

    Started by statsdud‎, 04-22-2008 05:43 AM
    2 Pages
    1 2
    • Replies: 17
    • Views: 7,495
    04-22-2008, 05:15 PM Go to last post
  36. frequency distribution of word length

    I want to be clear about the frequency distribution that what is this and what is mean by frequency distribution of word length? Can you please...

    Started by farakhkhan@yahoo.com‎, 04-20-2008 02:46 PM
    • Replies: 0
    • Views: 3,182
    04-20-2008, 02:46 PM Go to last post
  37. Normal Probability HELP!!!

    i have a question that asks what the probability that sales drop below 15000 per month , and also 18000 per month, mean is 20000 and stddev is 3000....

    Started by el1‎, 04-18-2008 08:42 PM
    • Replies: 0
    • Views: 2,264
    04-18-2008, 08:42 PM Go to last post
  38. Confidence intervals?

    Hi my questions is this. Using PHstat or by hand set up a 90% confidence interval estimate of the number of days absent. Sample of 25 people....

    Started by el1‎, 04-16-2008 07:03 PM
    • Replies: 2
    • Views: 3,317
    04-18-2008, 08:39 PM Go to last post
  39. Question Elevator probability question

    This morning, when I walked into the elevator, I had this question in my mind. Five people walk into an elevator at Ground level. There are 17...

    Started by oddsnevens‎, 04-17-2008 02:08 PM
    • Replies: 4
    • Views: 7,950
    04-18-2008, 02:27 PM Go to last post
  40. Probability of Word within Word

    Hello! I'm in dire need of help as I've been working on this for a couple days now. I've been to the help center around school and have had three...

    Started by Abbott54‎, 04-16-2008 11:20 AM
    • Replies: 2
    • Views: 4,505
    04-16-2008, 11:04 PM Go to last post
  41. Help Needed With A Normal Ditribution Problem.

    The test scores for 300 students were entered into computer, analysed and stored in a file. Someone accidentally erased a major portion of this file...

    Started by Stitch‎, 04-08-2008 01:19 PM
    • Replies: 1
    • Views: 2,243
    04-14-2008, 07:23 PM Go to last post
  42. Binomial Distribution

    I just want someone to please verify whether my approach to this problem is correct. The question goes as follows; Use a binomial distribution to...

    Started by Yorick‎, 04-10-2008 02:38 PM
    • Replies: 1
    • Views: 2,325
    04-14-2008, 07:15 PM Go to last post
  43. Comparing 2 choice simulations

    Hello there, I am stumped with a conceptual problem, for which I am sure there is a very simple solution. There are 2 computer models of...

    Started by Marc_J_Buehner‎, 04-12-2008 01:21 AM
    • Replies: 1
    • Views: 2,700
    04-14-2008, 07:03 PM Go to last post
  44. 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: 5,262
    04-13-2008, 08:07 PM Go to last post
  45. Probability Help!

    Its is known that different diseases can produce the same symtoms. We know that a particular sets of symptoms, which we will call H, can occur with...

    Started by uni-student‎, 04-12-2008 11:06 PM
    • Replies: 1
    • Views: 1,798
    04-12-2008, 11:55 PM Go to last post
  46. 3D Random Walk

    Okay, so I've got this random walk problem here: (a) Using an appropriate Dirac-delta function, find the probability density w(s) for...

    Started by Callmesomething‎, 04-11-2008 07:54 PM
    • Replies: 1
    • Views: 4,564
    04-12-2008, 11:32 PM Go to last post
  47. Unhappy poisson question

    I have great trouble translating word problems into a formula- I am particularly dyslexic with numbers. I have a problem that I have worked on for...

    Started by lkasse‎, 04-12-2008 09:27 AM
    • Replies: 0
    • Views: 2,456
    04-12-2008, 09:27 AM Go to last post
  48. Liberal Arts Major looking for help - instant win game probability

    Problem to solve regarding an instant win game. 35 million game pieces are circulated via the mail. Randomly, 1,000 winning game pieces of $5,000...

    Started by gobucks888‎, 04-11-2008 08:44 PM
    • Replies: 0
    • Views: 2,114
    04-11-2008, 08:44 PM Go to last post
  49. Probability distribution (NEED HELP BIG TIME)

    ========================================================= *PLEASE DON'T simply write the answer, I NEED STEP BY STEP, on how to do it...

    Started by uni-student‎, 04-10-2008 08:03 PM
    • Replies: 5
    • Views: 2,307
    04-11-2008, 09:15 AM Go to last post
  50. z standard normal

    First part of the question asks..if X is normal with mean = 8.48 and sd = 1.6, what are the 2 values of X which include central 80% of probability? ...

    Started by citibankak‎, 04-11-2008 12:21 AM
    • Replies: 1
    • Views: 5,420
    04-11-2008, 07:18 AM Go to last post
  51. probability help!

    mean = $1530 sd = $120 Bookstore must sell at least $1200 in sales to break even. What is the probabily that on a given day the bookstore will...

    Started by citibankak‎, 04-11-2008 12:22 AM
    • Replies: 1
    • Views: 2,094
    04-11-2008, 07:12 AM Go to last post
  52. Normal Distribution Help :(

    Hi i had a problem with a normal distribution question The question is: Find a and b such that P(a<X<b)=0.90 and such that a and b are the same...

    Started by brownboy‎, 04-09-2008 02:26 PM
    • Replies: 1
    • Views: 1,927
    04-10-2008, 01:01 PM Go to last post
  53. rock paper scissors vs flipping a quarter

    hello everybody. thanks for your reply ahead of time. scenario 2 people 1 time only game of rock paper scissors vs flipping a quarter what are...

    Started by fcbspain‎, 04-05-2008 08:37 AM
    • Replies: 7
    • Views: 6,039
    04-09-2008, 08:46 AM Go to last post
  54. Two discrete random variables

    Can anyone tell how to find the variance in this problem? The random variables X and Y are normally and independently distributed with means...

    Started by Stitch‎, 03-24-2008 10:46 PM
    • Replies: 10
    • Views: 4,330
    04-09-2008, 08:23 AM Go to last post
  55. Question Quads over Quads hhmmmmm

    I was wondering if anyone new how to calculate the odds of Quads beating Quads in a texas holdem game. Assuming their were no bets to make folders. ...

    Started by ZZ0QYMZZ‎, 04-09-2008 01:09 AM
    • Replies: 0
    • Views: 2,607
    04-09-2008, 01:09 AM Go to last post
  56. The probability of an event occur >90% of the time.

    An actor claims he signs 90&#37; of autographs asked for. A sample of 100 fans is taken with a normal distribution. What is the probability that the...

    Started by ttk3‎, 04-08-2008 08:25 PM
    • Replies: 1
    • Views: 2,754
    04-08-2008, 08:52 PM Go to last post
  57. Moment Generating Functions

    The random variable X has a uniform distribution on (0,1). Find the moment generating function of Y=-aln(X), and hence find the probability...

    Started by statsrocks‎, 04-05-2008 04:33 PM
    • Replies: 8
    • Views: 3,764
    04-06-2008, 12:26 PM Go to last post
  58. problem in sports statistics

    My problem is this. We have three javelin throwers A,B and C. It is known that A defeats B with probability 60&#37;, B defeats C with probability again...

    Started by kathmor‎, 04-06-2008 05:54 AM
    • Replies: 0
    • Views: 2,144
    04-06-2008, 05:54 AM Go to last post
  59. Round-Off errors

    Problem: A set of n numbers are to be added together, and before they are added, each number is rounded off to the nearest integer, thus introducing...

    Started by statsrocks‎, 04-05-2008 04:38 PM
    • Replies: 0
    • Views: 3,715
    04-05-2008, 04:38 PM Go to last post
  60. Poisson process

    Men, women and children make purchases at a counter in a shop according to independent Poisson processes with rates 10, 12 and 4 purchases per hour...

    Started by statsrocks‎, 04-05-2008 02:02 PM
    • Replies: 0
    • Views: 2,354
    04-05-2008, 02:02 PM Go to last post

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