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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. Joint pdf problem

    A manufacturer has designed a process to produce pipes that are 10 feet long. The distribution of the pipe length, however, is actually Uniform on...

    Started by eenu‎, 02-28-2008 02:00 AM
    • Replies: 0
    • Views: 3,950
    02-28-2008, 02:00 AM Go to last post
  2. Unhappy i need help with my homework please help!!!!

    Here are the questions: 1-5% of the items produced by a machine are defective.of the defective items produced by the machine,70% have minor defectes...

    Started by stat help‎, 02-29-2008 06:43 PM
    • Replies: 2
    • Views: 2,800
    02-29-2008, 07:53 PM Go to last post
  3. Second opinion?

    Ok, this problem looks simple, which is why I am wondering if maybe I have missed something? "Here's an interesting one, not hard but shows how...

    Started by Savvy‎, 02-29-2008 07:46 PM
    • Replies: 1
    • Views: 2,098
    03-01-2008, 03:45 PM Go to last post
  4. Need Expert Help: A Blackjack probability question

    Hello everyone, If someone wants to take a shot at figuring out the house/player edge in the following two situations, I would really appreciate...

    Started by ejwalden‎, 03-01-2008 04:40 PM
    • Replies: 0
    • Views: 2,285
    03-01-2008, 04:40 PM Go to last post
  5. Unhappy would some one confirm my answers

    1-Many universities require a student to take a math placement test as well as computer science placement test.80% of the students who take both...

    Started by stat help‎, 02-29-2008 08:37 PM
    • Replies: 2
    • Views: 2,097
    03-01-2008, 05:06 PM Go to last post
  6. Lightbulb Expected Number of Coin Flips

    A coin having probability p of landing heads is flipped 5 times and then flipped utill the pattern of the first 5 flips is observed again for the...

    Started by mmehdi‎, 03-02-2008 12:50 AM
    • Replies: 0
    • Views: 2,671
    03-02-2008, 12:50 AM Go to last post
  7. standard normal random variables

    I'm stumped on this question: Let Z1, Z2, Z3 be independent standard normal variables identify the distributions of a) (1/2)*(Z1-Z2)^2 b)...

    Started by themattler‎, 03-02-2008 09:04 PM
    • Replies: 0
    • Views: 2,502
    03-02-2008, 09:04 PM Go to last post
  8. Please help?

    this is the class of test scores of 31 students in a stat class. a) find the mean, median, standard deviation,shape of distribution(symmetric,skewed...

    Started by stat help‎, 03-02-2008 10:14 PM
    • Replies: 0
    • Views: 2,004
    03-02-2008, 10:14 PM Go to last post
  9. Some questions on Hypothesis, poissson and normal dist...try it

    Question 1 Millions of suburban commuters are finding railroads to be a convenient, time-saving, less stressful alternative to the automobile. While...

    Started by Shekhar‎, 10-22-2007 06:45 AM
    • Replies: 4
    • Views: 4,087
    03-03-2008, 01:53 PM Go to last post
  10. Homework Question

    Okay, so I have this question for homework and I really don't know what its asking me...if anyone can put it in layman terms for me I'd be really...

    Started by betticat‎, 03-04-2008 12:08 PM
    • Replies: 1
    • Views: 3,737
    03-04-2008, 12:27 PM Go to last post
  11. A Two Class Probability Problem

    This is a problem that has been bothering me for a while. Say you have 10 'things' and each thing can either be of class A or class B (mutually...

    Started by jensph‎, 03-04-2008 03:25 PM
    • Replies: 0
    • Views: 2,239
    03-04-2008, 03:25 PM Go to last post
  12. Variance of Zero

    If you have a variance of zero, will the probability be 100%, 50% or "cannot be determined"? Thanks!

    Started by Chessie‎, 03-04-2008 02:02 PM
    • Replies: 2
    • Views: 2,862
    03-04-2008, 03:49 PM Go to last post
  13. probability question

    how do i find the mean and standard deviation? Let the random variable x represent the number of girls in a family of three children. I...

    Started by Dewdrop731‎, 03-04-2008 07:46 PM
    • Replies: 0
    • Views: 1,646
    03-04-2008, 07:46 PM Go to last post
  14. Probability Question

    I have a short paper due on probability. Here's the info: First, we assume that Alex Rodriguez has four at bats and that the at bats are...

    Started by delilah86‎, 03-04-2008 08:33 PM
    • Replies: 0
    • Views: 1,906
    03-04-2008, 08:33 PM Go to last post
  15. Homework help

    Hi, I don't think this question is designed to be particularly difficult but I'm having trouble with it anyway: A ship arrives at a certain...

    Started by finger1011‎, 03-05-2008 01:03 PM
    • Replies: 2
    • Views: 3,122
    03-05-2008, 01:16 PM Go to last post
  16. Question Standard Normal Distribution z0

    I am a beginning student in Statistics. I don't understand the concept of z0, such as "find z0 such that P( -1.2 < z < z0 ) = 0.8671". It's not...

    Started by frd9226‎, 03-05-2008 09:11 AM
    • Replies: 1
    • Views: 6,519
    03-05-2008, 01:37 PM Go to last post
  17. 4th Super Bowl Victory

    When the NY Giants won Super Bowl XLII it was their 3rd Super Bowl victory AND it was also the third time that I created a NY Giants billboard in...

    Started by 3for3‎, 03-05-2008 02:06 PM
    • Replies: 0
    • Views: 2,244
    03-05-2008, 02:06 PM Go to last post
  18. Unhappy Loat at Chapter six

    Hi there everyone. My name is Katie and i'm algebraeiclly challenged lol. Okay so i thought i understood what was happening up until i got to chapter...

    Started by kateykatez‎, 03-07-2008 12:09 PM
    • Replies: 0
    • Views: 2,491
    03-07-2008, 12:09 PM Go to last post
  19. Red face Statistical probability

    Hello, I am writing a research paper and have a stats question. It is simple enough. Here is the instrument I am developing. And I...

    Started by Odisey‎, 03-09-2008 02:53 PM
    • Replies: 0
    • Views: 1,829
    03-09-2008, 02:53 PM Go to last post
  20. not a clue

    oi oi, hows it all going there is this thing in stats that i do not understand, dunno what it is called but hopefully someone might help if they...

    Started by whereszorro‎, 03-09-2008 12:35 PM
    • Replies: 2
    • Views: 3,113
    03-09-2008, 05:34 PM Go to last post
  21. sample space

    ok, so in this question, there are 6 people, 2 out of 6 can win the prize in the raffle. People: a,b,c,d,e,f and here is the sample space:...

    Started by salsa9417‎, 03-06-2008 02:36 AM
    • Replies: 8
    • Views: 3,353
    03-09-2008, 08:00 PM Go to last post
  22. Z Scores Probabilty...Can anyone help?

    Hey, Here is the question, I need some serious help!!!! A soft drink machine can be regulated so that it discharges and average of per cup. If...

    Started by spoochie1‎, 03-03-2008 08:18 PM
    • Replies: 4
    • Views: 2,155
    03-10-2008, 08:51 AM Go to last post
  23. Normal Distribution Questions Needed to Answered

    Find the area under the normal distribution curve. a.) Above z=1.34 b.) Above z=-1.34 c.) Between z=2.05 and z=1.34

    Started by jensen02431‎, 03-11-2008 11:25 AM
    • Replies: 1
    • Views: 3,238
    03-11-2008, 03:22 PM Go to last post
  24. Probability Question Needed to be Answered

    A youth group has eight boys and six girls. If a state of four officers is selected, find the probability that... a.) Three are girls? b.) Two...

    Started by jensen02431‎, 03-11-2008 11:19 AM
    • Replies: 1
    • Views: 5,656
    03-11-2008, 05:49 PM Go to last post
  25. two independent data in normal distribution

    Hello, Suppose we have normal distribution of measured data. We know what the standard deviation is for the whole distribution precisely from an...

    Started by veracity‎, 03-13-2008 02:07 AM
    • Replies: 0
    • Views: 2,581
    03-13-2008, 02:07 AM Go to last post
  26. Moment generating function?

    I need help solving what appears to be a fairly simple problem. Find the moment generating function of : fx(x)=xe^-x Can anyone help me get...

    Started by jer4011‎, 03-12-2008 09:22 PM
    • Replies: 5
    • Views: 3,762
    03-13-2008, 04:44 PM Go to last post
  27. Problem Solving Help

    Having trouble solving these problems not sure where to begin, anything will help. I have the answers not sure how to get them. -Suppose you...

    Started by lilsan1014‎, 03-13-2008 10:37 PM
    • Replies: 0
    • Views: 2,276
    03-13-2008, 10:37 PM Go to last post
  28. Markov chain

    hi I'm struggling with this question: (Genetics) Two animals are mated. From their offspring, two are selected and they are mated...

    Started by 1cookie‎, 03-15-2008 11:41 AM
    • Replies: 0
    • Views: 3,148
    03-15-2008, 11:41 AM Go to last post
  29. New stats

    Hi, new to this thread. I need some help with a stats problem that I recevied in my class. A soft drink bottling company maintains records...

    Started by Upandcoming‎, 03-16-2008 08:47 PM
    • Replies: 0
    • Views: 1,911
    03-16-2008, 08:47 PM Go to last post
  30. Drawing chips out of a hat Question?

    There is 1 blue chip and 5 white chips in a hat. The person drawing the blue chip is the designated driver for the night. No one wants to pick the...

    Started by Dwayne‎, 03-16-2008 09:44 AM
    • Replies: 1
    • Views: 3,374
    03-17-2008, 08:57 PM Go to last post
  31. Help On Probablity Immediatly

    For a particular brand of popcorn in an air popper, the average number of kernels that fail to pop is 6.8 per cup. a.) Find the probability that 5...

    Started by jensen02431‎, 03-13-2008 11:39 AM
    • Replies: 1
    • Views: 2,450
    03-17-2008, 09:20 PM Go to last post
  32. Need Help on Prob

    You are given three coins and told that two of them are biased and that they both have a 60% chance of coming up heads. The third coin is fair. You...

    Started by BaineHallow‎, 03-18-2008 12:59 AM
    • Replies: 2
    • Views: 2,714
    03-18-2008, 09:09 AM Go to last post
  33. Poisson distribution and p-value

    Does anyone know how to find a general p-value for the poisson distribution. All I have is the expected number of occurrences, given by the poisson...

    Started by Raynor5000‎, 03-18-2008 01:09 PM
    • Replies: 0
    • Views: 7,318
    03-18-2008, 01:09 PM Go to last post
  34. Need help on problem BIG TIME!

    Each trading day the value of a particular stock goes up one unit with probability 0.3, stays the same with probability 0.5 or else goes down one...

    Started by JoeyStorm‎, 03-18-2008 02:29 AM
    • Replies: 14
    • Views: 3,562
    03-18-2008, 11:16 PM Go to last post
  35. Weibull problem

    Hi all, I have this question on weibull but was not taught weibull in class. The text book didnt offer much weibull examples or solutions as well....

    Started by helloall‎, 03-19-2008 09:31 AM
    • Replies: 1
    • Views: 2,716
    03-19-2008, 03:51 PM Go to last post
  36. Bayes' Theorem

    Hi guys, I was hoping somebody might be able to help me with this question. The information I am given: Gamma1 = the risk of disease for...

    Started by abc123‎, 03-20-2008 07:34 AM
    • Replies: 0
    • Views: 2,649
    03-20-2008, 07:34 AM Go to last post
  37. New to Stats

    Trying to figure out which type of probability distribution to use on this problem. 48 new cars are shipped to local dealerships. 12 of these have...

    Started by Trip‎, 03-19-2008 04:44 PM
    • Replies: 2
    • Views: 2,254
    03-20-2008, 07:55 PM Go to last post
  38. Discrete Density

    Let X and Y be independent random variables assumed to be uniformly distributed on {0, 1/2, 1, 2} and { 1/2, 2, 4}, respectively. (a) What is the...

    Started by Stat_help‎, 03-19-2008 08:35 PM
    • Replies: 1
    • Views: 2,519
    03-22-2008, 01:56 AM Go to last post
  39. normal distribution problem

    I'm in intro. stats. Help please. Question is: Test scores normally distributed with mean=68.2 and standard deviation=10.4. Estimate probability...

    Started by stgolf‎, 03-22-2008 03:18 PM
    • Replies: 0
    • Views: 4,147
    03-22-2008, 03:18 PM Go to last post
  40. HELP! using continuity correction factor

    Hi, I have been having issues with this question: An airline company knows that 8% of its passengers will not show up for their flight. A plane...

    Started by katherine1‎, 02-15-2008 03:51 PM
    • Replies: 4
    • Views: 7,305
    03-26-2008, 08:26 AM Go to last post
  41. Is this multinomial distribution? Help.

    Suppose the random variables X, Y, and Z have the following joint probability distribution. Table below: x y z f(x,y,z) 1 1 1 0.05 1 1...

    Started by kyeong‎, 03-26-2008 11:33 PM
    • Replies: 1
    • Views: 3,761
    03-27-2008, 09:15 AM Go to last post
  42. Poisson Problem

    Can anyone help me with this question?: It is known that the number of persons entering the intensive care unit at a city hospital averages 5 per...

    Started by Stitch‎, 03-27-2008 10:36 PM
    • Replies: 0
    • Views: 2,384
    03-27-2008, 10:36 PM Go to last post
  43. Need help with this problem asap

    1. The average number of calls received by a switchboard in a 30-minute period is 15. What is the probability that between 10:00 and 10:30 the...

    Started by brigog‎, 03-30-2008 08:44 PM
    • Replies: 0
    • Views: 4,531
    03-30-2008, 08:44 PM Go to last post
  44. Which formula?

    If a question has given me the mean and standard deviation , what formula should i use?

    Started by el1‎, 03-30-2008 10:36 PM
    • Replies: 0
    • Views: 3,459
    03-30-2008, 10:36 PM Go to last post
  45. Angry Please help!! Basic Probability.

    Hi im having trouble with this question. If anyone could help me out thatd be great , Im not sure where to start! Heres info: The cost of...

    Started by el1‎, 03-30-2008 08:56 PM
    2 Pages
    1 2
    • Replies: 21
    • Views: 6,488
    03-30-2008, 10:38 PM Go to last post
  46. Freeman-Tukey transformation

    Hi everyone. I am pooling proportions for meta-analysis. As part of this project I have been exploring variance stabilizing transformations for...

    Started by PPDoc‎, 03-31-2008 12:12 AM
    • Replies: 0
    • Views: 8,046
    03-31-2008, 12:12 AM Go to last post
  47. Probability and Sampling Distribution Question

    Just before a city referendum on a school budget, a local newspaper polls 400 voters in an attempt to predict whether the budget will pass. Suppose...

    Started by deron.washington‎, 03-25-2008 10:38 PM
    • Replies: 2
    • Views: 5,744
    03-31-2008, 06:36 PM Go to last post
  48. Normal distribution?

    i think this is a normal distribution problem. The distribution of sales for a factory has mean 20,000 units per month with a standard deviation...

    Started by el1‎, 03-31-2008 09:11 PM
    • Replies: 0
    • Views: 1,919
    03-31-2008, 09:11 PM Go to last post
  49. continuous RV & probability Distributions

    :) hi all i m asking for a help actualy i realy didnt understand how does continuous random variable function can anyone pls explain me this or just...

    Started by kia‎, 04-01-2008 03:49 AM
    • Replies: 0
    • Views: 2,724
    04-01-2008, 03:49 AM Go to last post
  50. 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: 2,375
    04-05-2008, 02:02 PM Go to last post
  51. 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: 3,753
    04-05-2008, 04:38 PM Go to last post
  52. 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: 2,164
    04-06-2008, 05:54 AM Go to last post
  53. 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: 3,809
    04-06-2008, 12:26 PM Go to last post
  54. 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: 2,777
    04-08-2008, 08:52 PM 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: 2,636
    04-09-2008, 01:09 AM Go to last post
  56. 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: 4,363
    04-09-2008, 08:23 AM Go to last post
  57. 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: 6,089
    04-09-2008, 08:46 AM Go to last post
  58. 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: 1,944
    04-10-2008, 01:01 PM Go to last post
  59. 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: 2,113
    04-11-2008, 07:12 AM Go to last post
  60. 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: 5,503
    04-11-2008, 07:18 AM Go to last post

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