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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: 30,323
    09-30-2005, 09:44 AM Go to last post
  1. need help ASAP w/ problem.

    20 balloons, 4 white, 4 green, 4 red, 4 blue, 4 yellow. 10 kids; 4 boys and 6 girls. Each kid is to receive 2 balloons. What is the probability that...

    Started by fatguyinalilcoat‎, 10-22-2006 02:20 AM
    • Replies: 0
    • Views: 2,164
    10-22-2006, 02:20 AM Go to last post
  2. Basic Probability Question

    I have a question regarding basic proability. In the problem outlined below I am worried that I have calculated incorrectly. More specifically, I...

    Started by caransom‎, 10-21-2006 05:42 PM
    • Replies: 2
    • Views: 4,693
    10-22-2006, 02:53 PM Go to last post
  3. Conditionally independent with a Markov chain, please help

    Hi, I have a problem, I try to solve but still get stuck. Can you please read my solution and point out what my wrong points are? Xn is a...

    Started by vijakhara‎, 10-22-2006 04:48 PM
    • Replies: 0
    • Views: 2,610
    10-22-2006, 04:48 PM Go to last post
  4. Is this rectangular ?

    Consider the following rectangular distribution f(x) = 2 , 0 < x < 1/2 = 0 , elsewhere. Please suggest whether this is a geuine...

    Started by vinayan‎, 10-19-2006 09:33 AM
    • Replies: 2
    • Views: 1,957
    10-23-2006, 08:21 AM Go to last post
  5. Binomial Distribution Problem

    I'm at work, so I don't have the problem verbatim, but it's something like this: Suppose that companies who launch products with revenue growth as...

    Started by Merlik‎, 10-23-2006 08:49 AM
    • Replies: 0
    • Views: 3,316
    10-23-2006, 08:49 AM Go to last post
  6. simple coin flip problem

    hi, I recently discovered this forum and I think this could help me with my stats courses... I havent received the text book yet, so my first...

    Started by Logman‎, 09-30-2006 11:52 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 11,296
    10-23-2006, 09:09 AM Go to last post
  7. Problem Solving

    1) If both sexes are equally likely at birth, what is the probability that exactly 3 of 5 children will be girls? 2) About 8% of all rental cars...

    Started by xo_caroline_xo‎, 10-22-2006 11:49 AM
    • Replies: 1
    • Views: 2,554
    10-23-2006, 09:24 AM Go to last post
  8. i am confusing myself, pls help

    I have some simple probability questions but i am confusing myself. 1.) players roll 2 dice, each with 6-equally like sides. If you were to roll...

    Started by jojo‎, 10-22-2006 03:48 PM
    • Replies: 5
    • Views: 3,203
    10-23-2006, 09:33 AM Go to last post
  9. reallyneedhelpwithexpectedvalues

    I was wondering if anyone could help with the following: Magazine has 1,620,000 subscribers 640,000 - women 980,00 - men 30% OF WOMEN read...

    Started by glucky‎, 10-23-2006 06:12 PM
    • Replies: 3
    • Views: 4,735
    10-23-2006, 11:27 PM Go to last post
  10. Need Help For My Test Tommorow

    barry bonds of the san francisco giants had the highest batting average in the 2002 major league baseball season. his average was .370. so assume the...

    Started by piro829‎, 10-24-2006 01:36 AM
    • Replies: 3
    • Views: 2,541
    10-24-2006, 06:49 AM Go to last post
  11. Smile Little help please.

    Hello I;m a little confused here this is the problem. Judge red Cartolano Disposed cases: 3037 Appealed: 137 Reversed: 12 A=appealed...

    Started by laton123‎, 10-23-2006 02:44 PM
    • Replies: 3
    • Views: 3,228
    10-24-2006, 06:51 AM Go to last post
  12. Solving Complex Equation with Variable Factorials and Exponents

    The Problem: A very important 20-bit message is being sent via satellite, and there is a 5% probability that any single bit will be received...

    Started by nickcherryjiggz‎, 10-23-2006 09:59 PM
    • Replies: 1
    • Views: 4,272
    10-24-2006, 11:15 AM Go to last post
  13. Question Binomialdistribution

    The question is as follows: In a carnival game, a person can win a prize by guessing which one of 5 identical boxes contains the prize. After each...

    Started by glucky‎, 10-24-2006 12:27 PM
    • Replies: 0
    • Views: 5,474
    10-24-2006, 12:27 PM Go to last post
  14. Joint probability distribution functions

    So a joint pdf is of the form P(X,Y) = SS f(x,y) dx dy, where 'S' is the integral symbol. I've got to cook up the pdf for f(x,y), where X and Y...

    Started by Aegis‎, 10-23-2006 11:24 PM
    • Replies: 3
    • Views: 10,399
    10-25-2006, 07:34 PM Go to last post
  15. Exponential Distribution

    I am in a 400 level Probabilities/Stats class at my university and am stuck on a problem relating to exponential distribution. I will list the...

    Started by jaknowlden‎, 10-24-2006 08:40 PM
    • Replies: 7
    • Views: 9,919
    10-26-2006, 07:53 PM Go to last post
  16. Probability of sequential deaths and dates

    Hi all, I hope today finds you well and in good spirits. I'm trying to develope a statistical model and haven't done so in years. Any help is...

    Started by statistically_challenged‎, 10-27-2006 07:13 AM
    • Replies: 0
    • Views: 4,210
    10-27-2006, 07:13 AM Go to last post
  17. how to find joint probability distribution of 3 variables

    I am stuck in a problem. we have a red balls, b blue balls and c white balls. We are choosing n balls without replacement. How to find joint...

    Started by brunett1‎, 10-24-2006 11:31 PM
    • Replies: 2
    • Views: 9,184
    10-27-2006, 09:59 PM Go to last post
  18. Question A problem for the statistically inclined

    On the desk, you have 40 envelopes. Each contain a cash prize (unknown until opened): 5 - contain $10,000 6 - contain $5,000 9 - contain $1,000...

    Started by ChrisDoyle‎, 10-24-2006 07:39 PM
    • Replies: 3
    • Views: 2,974
    10-30-2006, 03:23 PM Go to last post
  19. Permutations with Duplicates

    I have been trying to find information about calculating permutations that include multiple duplicate items, but have only found programming source...

    Started by Peelman‎, 10-18-2006 03:38 AM
    • Replies: 10
    • Views: 22,103
    10-30-2006, 03:34 PM Go to last post
  20. probability confusion

    Hello everyone!!! I don't know if im experiencing a brain-fart these days, but I just can't figure this out. Here's a problem. I have more like...

    Started by speth‎, 10-27-2006 11:54 AM
    • Replies: 4
    • Views: 4,713
    10-31-2006, 10:34 PM Go to last post
  21. probability

    Hello all, I'm taking my first and final Statistics course (thankfully for me!) in college and I need a little bit of help on this one: ...

    Started by sherbert‎, 11-01-2006 01:23 PM
    • Replies: 3
    • Views: 3,188
    11-02-2006, 09:33 AM Go to last post
  22. Standard Deviation problem

    This is probably laughably easy, but I am doing this problem on a practice exam, and I keep getting it wrong. Question: The waiting time at a...

    Started by Westen‎, 11-02-2006 08:43 PM
    • Replies: 1
    • Views: 2,709
    11-03-2006, 09:23 AM Go to last post
  23. Probability help

    I'm unsure of how to set up these types of problems.... help will be very appreciated, thanks in advance.... A carton of 24 light bulbs includes...

    Started by Eulia‎, 11-03-2006 06:27 AM
    • Replies: 2
    • Views: 3,006
    11-03-2006, 09:48 AM Go to last post
  24. level of significance- pls help

    I dont know how to start. any help would be wonderful. The table below shows the composite grade of 300 students in a statistics course, and how...

    Started by sweetx‎, 11-02-2006 09:22 PM
    • Replies: 2
    • Views: 3,598
    11-03-2006, 09:58 AM Go to last post
  25. Question Probability Question

    Hi, I have two questions that I'm currently struggling with, the first one states that there are 40 red balls, 40 green balls, and 20 blue balls....

    Started by Megan‎, 11-03-2006 07:54 PM
    • Replies: 1
    • Views: 5,109
    11-04-2006, 08:27 AM Go to last post
  26. standard deviation / level of significance.

    In the manufacturing process of a particular painkiller, a machine is regulated to dispense 32 mg of caffeine per tablet. The machine will need...

    Started by sweetx‎, 11-02-2006 09:24 PM
    • Replies: 2
    • Views: 4,977
    11-04-2006, 11:14 AM Go to last post
  27. probability / level of significance

    I dont know how to start these probs. I will be posting 3 questions. My book says level of confidence. Is this the same as level of significance. Pls...

    Started by sweetx‎, 11-02-2006 09:19 PM
    • Replies: 2
    • Views: 3,178
    11-04-2006, 11:15 AM Go to last post
  28. Lottery Probability

    Having a really tough time with this one. Six different winning numbers are selected at random from, 1 to 37. A player also selects six...

    Started by checkeredshawn‎, 11-04-2006 12:42 AM
    • Replies: 2
    • Views: 3,100
    11-04-2006, 01:30 PM Go to last post
  29. A reversal of the Birthday Problem

    I hope today finds you well and in good spirits. I am trying to develop a model based, in part, on the Classic Birthday Problem. Looking at...

    Started by statistically_challenged‎, 11-05-2006 05:29 PM
    • Replies: 0
    • Views: 3,374
    11-05-2006, 05:29 PM Go to last post
  30. weibull distribution

    How could weibull random variables be generated from a uniform random numbers generator?

    Started by brunett1‎, 10-24-2006 06:00 PM
    • Replies: 1
    • Views: 3,347
    11-05-2006, 08:40 PM Go to last post
  31. CDF question

    It is proposed to model the annual salaries X (in $) paid to people in a particular occupation using the continuous cumulative distribution function:...

    Started by capo_mo‎, 11-03-2006 03:18 AM
    • Replies: 2
    • Views: 2,103
    11-06-2006, 05:49 PM Go to last post
  32. Probability Problem

    Hello, I'm having a problem with this question. In how many different ways can 6 girls and 5 boys stand in a row when all the boys have to stand...

    Started by Pilky‎, 11-06-2006 05:45 PM
    • Replies: 1
    • Views: 2,090
    11-06-2006, 06:51 PM Go to last post
  33. Question Probability Question

    I just handed in a test and I'm wondering if I used the correct formula for the following problem; the problem stated (this is not verbatim), a...

    Started by LynnLicorish‎, 11-01-2006 12:09 PM
    • Replies: 7
    • Views: 2,468
    11-07-2006, 08:42 AM Go to last post
  34. Poisson and a Moment-Generating Function

    I have a problem that provides for the moment-generating function of a Poisson random variable, X, as M(t) = e^(mu(e^t - 1)). Then I must find the...

    Started by jaknowlden‎, 11-06-2006 07:54 PM
    • Replies: 5
    • Views: 3,947
    11-08-2006, 08:57 PM Go to last post
  35. Can you get me started?

    A television store owner figures that 45% of the customers entering the store will purchase an ordinary television set, 15% will purchase a plasma...

    Started by teacher2be‎, 11-06-2006 08:34 PM
    • Replies: 7
    • Views: 5,776
    11-09-2006, 07:39 AM Go to last post
  36. continous random variables

    I need to find 1. the probability when X is less than or equal to 5. Given the following:- f(x) is 0.3 when x=0 0.014 when 0 is...

    Started by Naomikreinz‎, 10-30-2006 03:44 PM
    • Replies: 5
    • Views: 2,489
    11-10-2006, 05:06 PM Go to last post
  37. Expectance and Variance of Mixed Distributions

    Hi, How do I get the expectance and variance of mixed variables. I can't seem to get a good exampe on this.

    Started by Naomikreinz‎, 11-10-2006 05:16 PM
    • Replies: 1
    • Views: 9,849
    11-11-2006, 02:11 AM Go to last post
  38. Probability/Density Curve Question

    Quality control plan B calls for rejecting a battery as defective if its weight falls more than 2 standard deviations below the specified mean. ...

    Started by littlebreen‎, 11-09-2006 07:07 PM
    • Replies: 1
    • Views: 3,181
    11-11-2006, 02:33 AM Go to last post
  39. probability question

    for the total population of a large southern city, mean family income is $34,000, with a standard deviation (for the population) of $5,000. a....

    Started by kermie5184‎, 11-09-2006 10:06 AM
    • Replies: 1
    • Views: 3,724
    11-11-2006, 11:31 AM Go to last post
  40. Help needed!! fast!

    Hey guys, new to the forum. I've had this question and I'm so stuck on it. I'm not to good with probability so any feedback would be very helpful. ...

    Started by Escalade‎, 11-12-2006 09:32 PM
    • Replies: 1
    • Views: 2,675
    11-13-2006, 01:42 AM Go to last post
  41. Lognormal distribution

    I dont know where to begin on this one. I need to compute Q=a 50 year flood Q is lognormal distributed given Q= a 50 year flood mu=...

    Started by Naomikreinz‎, 11-13-2006 02:34 AM
    • Replies: 0
    • Views: 3,845
    11-13-2006, 02:34 AM Go to last post
  42. Baye's Theorem

    Hi, I have two questions that I am struggling with, that concern the Baye's Theorem.... 1) Mr. Smith's gardener is not dependable; the probability...

    Started by Eulia‎, 11-12-2006 04:16 PM
    • Replies: 1
    • Views: 6,432
    11-13-2006, 05:01 AM Go to last post
  43. question about probability

    Imagine that I have a bag filled with 200 milions of small balls of different colors (each color has the same number of balls). Furthermore, a ball...

    Started by faustino‎, 11-08-2006 09:29 AM
    • Replies: 4
    • Views: 2,850
    11-13-2006, 06:42 AM Go to last post
  44. Probability I am stuck - help please!

    Here's the question: The New York Times reported that 45 percent of the households in Manhattan District 5 participated in recycling. If 20...

    Started by Isis‎, 11-13-2006 08:52 AM
    • Replies: 2
    • Views: 3,313
    11-13-2006, 01:59 PM Go to last post
  45. Probability question

    I worked this out but am not confident i did it correctly. Could some one check it, and if not... please direct me. Im trying to grasp this.. ...

    Started by mrsjar‎, 11-11-2006 09:05 PM
    • Replies: 3
    • Views: 3,206
    11-13-2006, 05:42 PM Go to last post
  46. confidence interval for variance

    The provincial sales tax (pst) rate vary from province to province. Six of the rates are shown below. 5% 7% 8% 7% 9% 6% Compute a 95% confidence...

    Started by sweetx‎, 11-10-2006 11:52 PM
    • Replies: 5
    • Views: 2,523
    11-15-2006, 09:48 AM Go to last post
  47. Talking Help Please

    hello I really need some help.. I have a test tomorrow and Im still a little confused. MNM Corp. gives each of its employees an aptitude test. The...

    Started by KmClark84‎, 11-13-2006 06:29 PM
    • Replies: 1
    • Views: 2,436
    11-15-2006, 05:48 PM Go to last post
  48. Probability ?

    Assume that each year the IRS randomly audits 10% of the tax returns. If a married couple has filed seperate returns, a. what is the prob that both...

    Started by KmClark84‎, 11-13-2006 10:23 PM
    • Replies: 1
    • Views: 4,753
    11-15-2006, 06:01 PM Go to last post
  49. I Need Help!!

    Does anyone have any basic probability hints? I have a stats test tomorrow on probability, and am confused! I understand the basics, but getting into...

    Started by milkyway4679‎, 11-15-2006 08:18 PM
    • Replies: 0
    • Views: 2,618
    11-15-2006, 08:18 PM Go to last post
  50. kurtosis

    Hi, I am calculating the skewness of returns of 10,000 randomly selected portfolios with different portfolio sizes(where assets range from 2 to...

    Started by 12345678‎, 10-27-2006 08:23 PM
    • Replies: 2
    • Views: 4,750
    11-17-2006, 09:47 PM Go to last post
  51. Probability Help!

    I've been working on a couple of problems and I'm having a hard time figuring them out. A salesperson has 4 different types of term life...

    Started by strawberries‎, 11-20-2006 08:58 PM
    • Replies: 0
    • Views: 2,133
    11-20-2006, 08:58 PM Go to last post
  52. Please Help~~

    ignore this, I have solved the problem

    Started by abcboy‎, 11-17-2006 06:52 AM
    • Replies: 1
    • Views: 2,247
    11-21-2006, 12:41 AM Go to last post
  53. Probability question

    In a city where 30% occupants are foreign, the probability of a foreign being questioned is 40%, while for a local is 10%. What is the likelihood...

    Started by thedeath‎, 11-19-2006 06:34 AM
    • Replies: 2
    • Views: 2,426
    11-21-2006, 01:21 AM Go to last post
  54. Confidence interval, pls help

    Hi could i pls get some help with these questions. I dont want the answer. I would be greatful if someone could even tell me what formula i would...

    Started by sweetlady‎, 11-21-2006 11:20 AM
    • Replies: 2
    • Views: 5,632
    11-21-2006, 04:04 PM Go to last post
  55. 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: 2,249
    11-21-2006, 04:49 PM Go to last post
  56. 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: 3,182
    11-21-2006, 11:14 PM Go to last post
  57. 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: 4,306
    11-22-2006, 05:58 AM Go to last post
  58. 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: 2,738
    11-22-2006, 11:15 AM Go to last post
  59. 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: 1,756
    11-22-2006, 11:20 AM Go to last post
  60. 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: 1,916
    11-24-2006, 08:00 AM Go to last post

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