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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: 30,406
    09-30-2005, 09:44 AM Go to last post
  1. help with simple probability problem

    see other thread - couldn't find how to delete this message - sorry

    Started by esquire918‎, 01-13-2007 05:55 PM
    • Replies: 0
    • Views: 1,988
    01-13-2007, 05:55 PM Go to last post
  2. Help with these probability problems

    1. Conditional Prob: Approximately 1/125 of all births are fraternal twins and 1/300 of births are identical twins. Elvis Presley had a twin brother...

    Started by yupeh‎, 12-30-2006 06:59 AM
    • Replies: 1
    • Views: 6,404
    01-13-2007, 12:58 PM Go to last post
  3. Smile Normal Distribution question

    Help help i have a test on monday and i know nothing!!! I am doing these questions and i have stumbled upon a pickle... The heights of girls of a...

    Started by statshelp1‎, 01-11-2007 04:25 PM
    • Replies: 3
    • Views: 2,696
    01-13-2007, 08:47 AM Go to last post
  4. Expectation/Population Mean

    I'm working on a question where 6 balanced coins and 2 balaned diced are tossed together. Z= sum of the scores on dice and number of heads. I have...

    Started by sdw86‎, 01-10-2007 10:09 PM
    • Replies: 2
    • Views: 2,969
    01-12-2007, 07:41 PM Go to last post
  5. Geometric Probability

    Can someone help me with this problem and check my answer.. (I know its a long read but the questions are not hard) Mr. Nedrdly, the long time ap...

    Started by Stunt101‎, 01-12-2007 05:32 PM
    • Replies: 1
    • Views: 8,109
    01-12-2007, 07:30 PM Go to last post
  6. Multiple poisson versus one poisson for different arrival types

    I am trying to model guest arrivals at a restaurant with exponentially distributed times between arrivals. Arrivals can consist of different party...

    Started by patl‎, 01-05-2007 01:20 PM
    • Replies: 1
    • Views: 4,399
    01-12-2007, 06:47 PM Go to last post
  7. A combinations problem

    Hello everyone! Iím only beginning to study statistics. The problem is easy, yet I need help :o A shelf contains 6 separate compartments. In how...

    Started by Olga‎, 12-26-2006 03:35 AM
    • Replies: 1
    • Views: 4,670
    01-11-2007, 05:58 PM Go to last post
  8. Gumbel distribution

    I have another one for you guys. Am still trying to figure out the other ones. 1. The problem statement, all variables and given/known data The...

    Started by Naomikreinz‎, 01-10-2007 04:06 PM
    • Replies: 0
    • Views: 2,469
    01-10-2007, 04:06 PM Go to last post
  9. Probability

    Hi guys I have 2 probability questions a. An impounding reservoir is designed so as to have sufficient capacity to meet the water requirements of a...

    Started by Naomikreinz‎, 01-09-2007 02:03 PM
    • Replies: 0
    • Views: 1,764
    01-09-2007, 02:03 PM Go to last post
  10. Smile A simple expectation problem!

    guys, consider we have N numbers (no equal numbers). we want to find the maximum of these numbers. The method is like this... I choose one of...

    Started by fantasticamir‎, 01-02-2007 05:54 PM
    • Replies: 0
    • Views: 2,015
    01-02-2007, 05:54 PM Go to last post
  11. statistics/ regression line. I started, im stuck

    sorry i posted the wrong message and needed to delete it.

    Started by sweetx‎, 12-29-2006 11:10 AM
    • Replies: 0
    • Views: 2,360
    12-29-2006, 11:10 AM Go to last post
  12. Fair Coins and Dices

    hello, I need a wee help with this probability problem... A fair dice is thrown until 'H' turnes up for the first time. Let N be the number of...

    Started by WeeG‎, 12-27-2006 03:11 AM
    • Replies: 1
    • Views: 2,918
    12-27-2006, 07:16 AM Go to last post
  13. one more probability question...

    A non fair coin fell on "Head" with probability p and on Tail with probability q=1-p. Let Pn be the probability that in n throws of the coin there...

    Started by WeeG‎, 12-27-2006 03:19 AM
    • Replies: 0
    • Views: 1,809
    12-27-2006, 03:19 AM Go to last post
  14. Binomial probablity

    According to National Highway traffic Safety Administration 66% of California motorists use seat belts. Find the probablity that in one group of 12...

    Started by danny.kay‎, 12-24-2006 08:44 AM
    • Replies: 1
    • Views: 2,824
    12-27-2006, 12:20 AM Go to last post
  15. probability for "identity"

    In a new show on tv, a contestant has to guess the identity of 12 strangers. To win the grand prize the contestant has to guess all twelve. I...

    Started by zipzapzop‎, 12-20-2006 06:05 PM
    • Replies: 2
    • Views: 1,903
    12-21-2006, 06:33 PM Go to last post
  16. Pls tell me if my answer is correct / level of sig

    My question is: A diet and exercise program was designed to reduce absenteeism of employees at a large company. A study of 10 employees...

    Started by sweetx‎, 12-14-2006 02:00 PM
    • Replies: 6
    • Views: 3,168
    12-21-2006, 09:36 AM Go to last post
  17. Cool a binomial probability question

    please help... Steele Electronics, Inc. sells expensive brands of stereo equipment in several shopping malls throghout the northwest section of...

    Started by mllgk‎, 12-17-2006 04:18 PM
    • Replies: 3
    • Views: 4,926
    12-20-2006, 05:25 PM Go to last post
  18. Urgent:Three Independent Identically Distr. Geo.Rand Variables...Not a clue.

    Hi everyone, this is my first time posting. Hopefully, I haven't managed to break one of the rules on my first time out, but it does happen....

    Started by Fusca Lupa‎, 11-18-2006 11:34 PM
    • Replies: 1
    • Views: 2,657
    12-19-2006, 06:06 AM Go to last post
  19. No of ways

    There are 5 women and 5 men. If a committee of four is chosen, find the number of ways that at least 2 women are chosen? the first card is 5...

    Started by leekit‎, 05-25-2006 10:17 AM
    • Replies: 1
    • Views: 2,478
    12-19-2006, 05:39 AM Go to last post
  20. random walk

    maybe you can help me... i've a theoretical problem: let X_n be a random walk over Z defined by For l,m in Z let

    Started by Alvin‎, 12-18-2006 08:34 PM
    • Replies: 1
    • Views: 3,889
    12-19-2006, 05:01 AM Go to last post
  21. Marbles

    I really suck with probability questions...can someone help me out here? Each of two boxes contains 20 marbles, and each marble is either black or...

    Started by MathMage89‎, 11-27-2006 09:37 PM
    • Replies: 1
    • Views: 3,195
    12-18-2006, 04:06 PM Go to last post
  22. Probability distributions

    Part of the question: Senior forecaster predicted an expected demand of 20,000 units with a 0.90 probability that demand would be between 10,000...

    Started by gatorjo‎, 12-11-2006 10:37 PM
    • Replies: 1
    • Views: 3,101
    12-18-2006, 01:12 PM Go to last post
  23. can someone check this work pls

    Question Is there any relationship between a personís sex and how frequently that person reads the sports section of a local news paper? A...

    Started by sweetx‎, 12-14-2006 01:59 PM
    • Replies: 2
    • Views: 2,401
    12-16-2006, 04:15 AM Go to last post
  24. second sig leve prob/ pls tell me if my answer is correct

    QUESTION: Fifteen students are randomly assigned to three different instructional methods for teaching statistics. At the end of the course,...

    Started by sweetx‎, 12-14-2006 02:00 PM
    • Replies: 0
    • Views: 2,413
    12-14-2006, 02:00 PM Go to last post
  25. Probability of being dealt a card

    This is not for a homework assignment, rather for my general knowledge. I'm having trouble calculating the percentages of being dealt one of several...

    Started by hikesterson‎, 12-13-2006 05:21 PM
    • Replies: 1
    • Views: 4,073
    12-14-2006, 02:25 AM Go to last post
  26. A Tuberculosis Test....

    :confused: A Tuberculosis Test is given to a sample of 3 TB patients. The test will detects the diease 95% of the time. Let y denote a positive...

    Started by strawberries‎, 12-12-2006 02:37 PM
    • Replies: 2
    • Views: 2,624
    12-13-2006, 12:46 PM Go to last post
  27. Deriving probability distribution

    I've got a dataset of electricity prices for in New York City for the past five years. Surprisingly, prices can be both negative and positive (don't...

    Started by pcappers‎, 12-12-2006 05:12 PM
    • Replies: 1
    • Views: 2,703
    12-13-2006, 06:35 AM Go to last post
  28. I Need Help Fast

    I HAVE AN EXAM ON WEDNESDAY AND CANNOT FIGURE OUT THESE TWO PROBLEMS FOR THE LIFE OF ME. IS THERE ANY WAY SOMEONE CAN TELL ME HOW TO DO THEM! 1. A...

    Started by ajones1225‎, 12-11-2006 03:54 PM
    • Replies: 7
    • Views: 3,294
    12-13-2006, 06:26 AM Go to last post
  29. Exclamation Probability Help!

    :confused: It is known that 30% of the patients who have a certain ear diease will eventually lose their hearing ability. In a smaple of 15...

    Started by strawberries‎, 12-12-2006 01:19 PM
    • Replies: 2
    • Views: 2,314
    12-12-2006, 02:24 PM Go to last post
  30. Need Probability Help FAST

    I have a test on Thursday and i can't figure out the homework for the life of me. I got an A on the first test but now Im just confused. Help PLEASE.

    Started by xtina34‎, 12-11-2006 09:21 PM
    • Replies: 1
    • Views: 2,200
    12-11-2006, 09:26 PM Go to last post
  31. 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: 5,281
    12-11-2006, 08:32 PM Go to last post
  32. Expectation law

    If I know distribution of x and know distribution of y. How do I find expected value for z if z=xy?

    Started by estherhandle‎, 12-06-2006 09:23 PM
    • Replies: 1
    • Views: 3,183
    12-11-2006, 12:46 AM Go to last post
  33. Normal Distribution

    Known that 15 % of all homeowners pay a montly mortgage of more than 2500 and that the standard deviation of the montly mortgage payments of ALL...

    Started by lilmocha‎, 12-08-2006 01:28 PM
    • Replies: 1
    • Views: 2,291
    12-11-2006, 12:40 AM Go to last post
  34. Interesting Probability Question

    A baker who makes bread daily sells an average of five breads a day. How many breads should he make each day so that the probability of running out...

    Started by lilmocha‎, 12-08-2006 12:20 PM
    • Replies: 1
    • Views: 2,745
    12-11-2006, 12:34 AM Go to last post
  35. stat example

    Hi, I'm working on a problem and I'm stuck. Can anyone please guide me through this? Thanks! After meeting with the regional sales managers,...

    Started by needhelpforstat‎, 12-09-2006 11:41 AM
    • Replies: 1
    • Views: 3,757
    12-10-2006, 08:05 PM Go to last post
  36. Random Variable Probability HW Help.

    I am lost due to the fact that extra information was provided. An investor plans to invest $50,000 in one of four investments. The return on each...

    Started by barnetod‎, 12-04-2006 10:13 PM
    • Replies: 3
    • Views: 6,946
    12-07-2006, 07:54 AM Go to last post
  37. A problem about large deviation theory

    In a large deviation principle, a closed set can be found its upper bound while an open set can be obtained its lower bound. Why?

    Started by osuanle‎, 12-05-2006 03:44 PM
    • Replies: 0
    • Views: 2,334
    12-05-2006, 03:44 PM Go to last post
  38. probability

    I'm very confused on where to start on my statistics project. I need help please. It says: "a woman has her purse stolen in LA by a young blonde...

    Started by allison‎, 12-04-2006 10:22 PM
    • Replies: 1
    • Views: 2,921
    12-05-2006, 09:25 AM Go to last post
  39. Expected value, variance, standard deviation

    I am kind of stuck :confused: Problem: A random variable X has the distribution: px = ( 0 1 2 4 ) ...

    Started by i97supratti‎, 12-04-2006 05:14 PM
    • Replies: 3
    • Views: 7,801
    12-04-2006, 11:02 PM Go to last post
  40. Binomail question

    Can you tell me what I'm doing wrong? If I'm rolling exactly 2 threes in 5 rolls of a fair die, would I not: n!/k! (n-k)! and this would be...

    Started by stacy foreman‎, 11-29-2006 04:14 PM
    • Replies: 2
    • Views: 2,385
    12-04-2006, 04:15 PM Go to last post
  41. help me

    can any bady help me to solve this problem :confused: Problem 1: An airline finds that 4 percent of the passengers that make reservations on a...

    Started by meme‎, 04-04-2006 03:35 PM
    • Replies: 6
    • Views: 2,738
    12-04-2006, 04:11 PM Go to last post
  42. how to show median of uniform sample converges to 1/2 a.s.

    Let X(1), X(2),... X(2n+1) be independent identically distributed U random variables. Define M(n) is the median of them.show that M(n) converges...

    Started by leosong‎, 11-15-2006 07:50 PM
    • Replies: 1
    • Views: 2,961
    12-04-2006, 04:50 AM Go to last post
  43. Probability Question

    I think I figured this one out. Thanks.

    Started by KnifeRun‎, 12-02-2006 09:06 PM
    • Replies: 3
    • Views: 2,213
    12-04-2006, 01:19 AM Go to last post
  44. Probability Help

    I'm having trouble solving this question, I'll really appreciate your help. Thanks so much! If two cards are drawn at random from an ordinary deck...

    Started by Evangeline‎, 11-12-2006 04:29 PM
    • Replies: 3
    • Views: 2,259
    12-02-2006, 07:04 PM Go to last post
  45. Probability dish washer!!

    Hi I' m really stuck, please help if u can. New dish washer, probabilities the machine needs repairs: 2 types of repair: new pc, new circuits....

    Started by piklas‎, 11-29-2006 02:30 PM
    • Replies: 9
    • Views: 2,638
    12-02-2006, 04:16 PM Go to last post
  46. using wrong distribution

    A small simple random sample is selected from a normally distributed populations for which population variance unknown. Construction of a confidence...

    Started by Albert‎, 11-30-2006 02:06 PM
    • Replies: 3
    • Views: 4,440
    11-30-2006, 04:01 PM Go to last post
  47. Question Homework Question Need Help ASAP

    I have a homework problem that I am really stuck on and unfortunately it is due by wednesday so I am hoping someone can help me out. Here it goes: ...

    Started by Jessicamaher‎, 11-27-2006 10:47 PM
    • Replies: 1
    • Views: 7,663
    11-28-2006, 09:11 AM Go to last post
  48. Please Help! (normal distribution)

    I'm stuggling with these problems (I'm not really sure how to set them up). I'll really appreciate the help, thanks in advance =) 1)The...

    Started by Evangeline‎, 11-25-2006 10:47 PM
    • Replies: 2
    • Views: 3,066
    11-28-2006, 01:33 AM Go to last post
  49. Homework Question

    kkkkkkkkkkkkkkkkkkkkkkkkk

    Started by KnifeRun‎, 11-27-2006 09:07 PM
    • Replies: 0
    • Views: 3,483
    11-27-2006, 09:07 PM Go to last post
  50. Probability question

    In a large area 70% of the people live in suburb, the rest in the city: out of those who live in suburban areas. 20% work for fast food resaurants. ...

    Started by strawberries‎, 11-21-2006 10:57 AM
    • Replies: 2
    • Views: 2,001
    11-27-2006, 05:42 PM Go to last post
  51. Probability Question

    Hello there!!! I wonder if anyone familiar with the probability theory can help me to clarify the following. There is trading system which...

    Started by zealot‎, 11-26-2006 02:39 PM
    • Replies: 5
    • Views: 2,765
    11-27-2006, 01:20 AM Go to last post
  52. Kurtosis Central limit vs No central limit

    Hi, I am discovering that certain softwares report different measures for kurtosis. Mainly the central limit kurtosis and non central limit...

    Started by 12345678‎, 11-25-2006 11:35 AM
    • Replies: 0
    • Views: 3,089
    11-25-2006, 11:35 AM Go to last post
  53. Birthday problem

    ignore this, I have solved the problem

    Started by abcboy‎, 11-25-2006 12:52 AM
    • Replies: 0
    • Views: 2,468
    11-25-2006, 12:52 AM Go to last post
  54. Variance and correlation coefficient

    Nothing to see here :)

    Started by bklstheman‎, 11-23-2006 10:45 AM
    • Replies: 1
    • Views: 2,234
    11-24-2006, 12:15 PM Go to last post
  55. A problem about expected value

    given two variables satisfying uniformly distribution as p1~U(0,a1),p2~U(0,a2), there is a random variable defined as s=(a1*p2-a2*p1)/(p1+p2). ...

    Started by csulazybug‎, 11-24-2006 08:00 AM
    • Replies: 0
    • Views: 1,918
    11-24-2006, 08:00 AM Go to last post
  56. Determining the test to be applied

    Find the 96% confidence limits for the true mean weekly study time of students if a sample of 25 had an average of 20 hrs per week and a sd of 3 hrs.

    Started by thedeath‎, 11-21-2006 01:28 AM
    • Replies: 3
    • Views: 1,770
    11-22-2006, 11:20 AM Go to last post
  57. Need some homework help. (work provided)

    Hey guys my current book I am using is statistics and the author is weiss just fyi. I am real confused about a concept. here is the question. ...

    Started by barnetod‎, 11-22-2006 03:49 AM
    • Replies: 1
    • Views: 2,751
    11-22-2006, 11:15 AM Go to last post
  58. Expected value of X

    R.V. X, given E(x+4)=10 and E=116, determine: Var(X+4); E(X)=mu Var(X)=sigma^2

    Started by landofsong‎, 11-20-2006 09:08 PM
    • Replies: 2
    • Views: 4,325
    11-22-2006, 05:58 AM Go to last post
  59. I'm very confused...(Normal Distribution)

    Hi people...I really should of come here sooner to try and ask for help, but I just kept letting myself sink deeper and deeper... Now I have some...

    Started by DarrenCax‎, 11-20-2006 02:30 AM
    • Replies: 4
    • Views: 3,210
    11-21-2006, 11:14 PM Go to last post
  60. Planting Flowers

    Four triangular gardening plots form a square as shown. Each plot will contain one kind of flower, and flowers in plots that share an edge will be...

    Started by MathMage89‎, 11-21-2006 04:49 PM
    • Replies: 0
    • Views: 2,260
    11-21-2006, 04:49 PM Go to last post

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