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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: 30,199
    09-30-2005, 09:44 AM Go to last post
  1. painted cubes

    How many different ways can 3 cubes be painted if each cube is painted one color and only the 3 colors red, blue, and green are available? (Order is...

    Started by dknight237‎, 07-30-2009 09:45 AM
    • Replies: 3
    • Views: 4,607
    07-30-2009, 02:49 PM Go to last post
  2. Finding distribution from MGF

    Hello, I'm studying for an exam and there is a question that I'll have to know how to do but I have no idea how to figure it out. Any help would be...

    Started by rose13‎, 07-27-2009 11:10 AM
    • Replies: 1
    • Views: 2,889
    07-28-2009, 12:04 AM Go to last post
  3. probability of vaccine

    In a large population, 64 % of the people have been vaccinated. If 3 people are randomly selected, what is the probability that AT LEAST ONE of them...

    Started by reaper‎, 07-26-2009 12:38 AM
    • Replies: 1
    • Views: 2,943
    07-26-2009, 05:08 AM Go to last post
  4. Combined probabilities

    Hi all! I have a pretty interesting problem that I was hoping someone here could help me with. I am designing an application where a given user...

    Started by dbnelson2403‎, 07-24-2009 11:59 PM
    • Replies: 0
    • Views: 2,771
    07-24-2009, 11:59 PM Go to last post
  5. Just checking if I'm right... conditional prob

    Hi, everyone :wave:. Newb to the forum here. Thanks in advance for taking a look at this! this isn't homework, so i can't confirm if the answer is...

    Started by uneakbreed‎, 07-22-2009 03:21 PM
    • Replies: 1
    • Views: 2,333
    07-24-2009, 12:21 PM Go to last post
  6. 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: 5,850
    07-24-2009, 11:24 AM Go to last post
  7. Combinatorices

    Hello, I have a small question please... In a building there are 8 floors, in each floor, there are 4 flats. In each flat lives a couple ( man &...

    Started by WeeG‎, 07-22-2009 08:18 AM
    • Replies: 1
    • Views: 2,709
    07-22-2009, 03:53 PM Go to last post
  8. chebishev

    1) a dice is being rolled 360 times. the dice has 1 red side and 5 black. what is the upper bound to the probability of falling on a red side more...

    Started by WeeG‎, 07-22-2009 03:27 PM
    • Replies: 0
    • Views: 1,509
    07-22-2009, 03:27 PM Go to last post
  9. want to understand problem and logic behind it

    Hi guys, Say you have a 1/10 chance of hitting a jackpot. If you run that 1/10 probability 10 times, what are the chances you hit the jackpot...

    Started by sdeep27‎, 07-21-2009 10:38 AM
    • Replies: 1
    • Views: 2,198
    07-21-2009, 11:04 AM Go to last post
  10. Random Sampling of a distribution in excel

    Requesting help to simplify random sampling of a distribution in excel. Givens are P50, Mean, u and sigma. Can this be accomplished with a...

    Started by rpmc‎, 07-20-2009 05:36 AM
    • Replies: 1
    • Views: 3,042
    07-20-2009, 02:07 PM Go to last post
  11. Can ANYONE solve this??????

    I am trying to figure out the method I should use to find the probability of picking any rank of cards (Ace through Deuce) from a standard deck of 52...

    Started by DCtheplace2b‎, 07-18-2009 12:14 PM
    • Replies: 5
    • Views: 3,034
    07-20-2009, 01:15 PM Go to last post
  12. X=0 almost surely => E(X)=0

    Axioms of expectation: 1. X>0 => E(X)>0 2. E(1)=1 3. E(aX+bY) = aE(X) + bE(Y) 4. If X_n is a nondecreasing sequence of numbers and lim(X_n) = X,...

    Started by kingwinner‎, 07-07-2009 10:05 PM
    • Replies: 14
    • Views: 4,513
    07-20-2009, 12:59 AM Go to last post
  13. New Approach

    :confused::confused: I am still unable to find the probability of drawing only ONE queen if 5 cards are dealt from a standard deck of 52. I think I...

    Started by DCtheplace2b‎, 07-18-2009 09:20 PM
    • Replies: 2
    • Views: 2,084
    07-19-2009, 01:24 PM Go to last post
  14. Help required in probabilitiy

    Dear All, Please help me solving these problems in statistics. Appreciate your response. 1. Jeevan is the line supervisor for a manufacturing...

    Started by janny‎, 07-17-2009 05:25 AM
    • Replies: 0
    • Views: 2,613
    07-17-2009, 05:25 AM Go to last post
  15. Order Statistics problem

    Let X1...Xn be independent, identically, distributed random variables. Determine the cumulative distribution functions of X(k),n, the kth largest of...

    Started by mobius0‎, 07-16-2009 11:08 PM
    • Replies: 1
    • Views: 2,344
    07-17-2009, 01:25 AM Go to last post
  16. Calculation of Frequency

    Hi, I am trying to calculate the probability of randomly picking a card (A through 2) from a standard deck of 52 + 1 joker if 5 cards are dealt. ...

    Started by DCtheplace2b‎, 07-16-2009 04:04 PM
    • Replies: 0
    • Views: 1,751
    07-16-2009, 04:04 PM Go to last post
  17. Determing Return Periods

    Hello users, I have a cummulative distribution (weibull) for a variable and I want to know how to calculate the return period (5, 10, 15, 20, 50...

    Started by lpmelo‎, 07-16-2009 11:51 AM
    • Replies: 0
    • Views: 2,124
    07-16-2009, 11:51 AM Go to last post
  18. Stochastic Processes

    Hello all! I'm looking for a good beginner text in stochastic processes. Can anyone recommend one? Much thanks!

    Started by jamesmartinn‎, 07-16-2009 09:48 AM
    • Replies: 1
    • Views: 3,578
    07-16-2009, 10:29 AM Go to last post
  19. E(X) < ∞ ? What does it mean?

    Let X and Y be random variables, F be a function. I have seen in a variety of contexts that they write "E(X) < ∞". What does it mean? My guess is...

    Started by kingwinner‎, 07-14-2009 11:49 PM
    • Replies: 5
    • Views: 16,850
    07-15-2009, 05:30 PM Go to last post
  20. Show that X+Y has a finite second moment

    Prove that if X and Y have finite second moments, then X+Y has a finite second moment. Attempt: (X+Y)^2 ≤ X^2 + Y^2 + 2|XY| => E ≤ E(X^2) +...

    Started by kingwinner‎, 07-14-2009 11:23 PM
    • Replies: 3
    • Views: 4,286
    07-15-2009, 09:00 AM Go to last post
  21. Multiple Regression?

    Hi I wonder if somebody can help me i've been hurting my head all day trying to figure out how to do this... The last time i did statistics was...

    Started by BillyC‎, 07-14-2009 11:59 AM
    • Replies: 2
    • Views: 3,466
    07-15-2009, 02:31 AM Go to last post
  22. Confidence interval for binary data

    Hi, I've got binary data (0 & 1's) which I represent as a average along a variable "speed". E.g. when speed is 5, the data is and I present that by...

    Started by jhnienhuis‎, 07-14-2009 12:03 PM
    • Replies: 0
    • Views: 7,552
    07-14-2009, 12:03 PM Go to last post
  23. Pareto Distribution with different percentages

    I recently coded up my program to generate data that reflects a Pareto distribution but I was wondering how I should go about coding up something...

    Started by legend‎, 07-13-2009 10:04 PM
    • Replies: 0
    • Views: 1,986
    07-13-2009, 10:04 PM Go to last post
  24. is this a renewal process?

    Hi. I'm having trouble with renewal processes. I want to obtain a long run cost, and to do that, I want to prove that a process is a renewal process,...

    Started by alejandro107‎, 07-13-2009 05:35 PM
    • Replies: 0
    • Views: 1,898
    07-13-2009, 05:35 PM Go to last post
  25. Night Shift Rotation

    There are 25 machinists employeed by a company a. if a night crew consists of 3 machinists, how many different crews are possible. (is this a...

    Started by psu2007‎, 07-13-2009 07:36 AM
    • Replies: 0
    • Views: 3,456
    07-13-2009, 07:36 AM Go to last post
  26. Dividing 4 people into 4 groups

    A group of 100 people are divided evenly into 4 subgroups. There are 4 friends within the groups. What is the probability that the 4 friends will...

    Started by mobius0‎, 07-11-2009 03:10 PM
    • Replies: 1
    • Views: 3,398
    07-12-2009, 06:37 AM Go to last post
  27. 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: 2,115
    07-12-2009, 12:49 AM Go to last post
  28. Baye's Theorem Urn Problem

    Hi, I am having some trouble with this problem: Suppose there are 3 urns. You choose one from which you will choose 2 balls from. Urn 1 has 4 red...

    Started by mobius0‎, 07-09-2009 10:17 PM
    • Replies: 5
    • Views: 5,322
    07-11-2009, 10:44 AM Go to last post
  29. real estate probability

    A real estate agent is showing homes to a prospective buyer. There are 12 homes in the desired price range listed in the area. The buyer has time...

    Started by psu2007‎, 07-10-2009 01:28 PM
    • Replies: 1
    • Views: 6,558
    07-11-2009, 08:03 AM Go to last post
  30. defective parts

    The ABC manufacturing company purchases a certain part from two suppliers (A supplier & B supplier). The parts received from the suppliers are used...

    Started by psu2007‎, 07-10-2009 01:29 PM
    • Replies: 0
    • Views: 4,389
    07-10-2009, 01:29 PM Go to last post
  31. Crews of 3

    There are 25 machinists employeed by a company a. if a night crew consists of 3 machinists, how many different crews are possible. (is this a...

    Started by psu2007‎, 07-10-2009 01:17 PM
    • Replies: 0
    • Views: 2,668
    07-10-2009, 01:17 PM Go to last post
  32. simple conditional expectation

    Hi there, I have f(x1|x2) and I want to derive: E(X1|X1>c,X2). Is it possible? Isn't the following correct?: E(X1|X1>c,X2)= ...

    Started by leo nidas‎, 07-10-2009 11:07 AM
    • Replies: 1
    • Views: 2,568
    07-10-2009, 12:19 PM Go to last post
  33. Envelope-letter matching problem

    Suppose we have "n" envelopes and "n" letters and we put letters to envelopes at random. Let I_i = I({i-th letter matches}) =1 if the i-th letter...

    Started by kingwinner‎, 07-10-2009 03:40 AM
    • Replies: 1
    • Views: 5,103
    07-10-2009, 06:34 AM Go to last post
  34. Probability Question...

    Hi guys, so here is the question that kinda confuses me. Total land area for a country is 9,094 km's, of this land about 4,176 km's is forested. ...

    Started by tkirby‎, 07-10-2009 12:14 AM
    • Replies: 1
    • Views: 1,932
    07-10-2009, 12:43 AM Go to last post
  35. Urgent Help with Probability

    Im given a graph which outlines the color of the car and the probability of a person choosing that car. White: .19 (probability) Silver: .18 ...

    Started by tkirby‎, 07-10-2009 12:30 AM
    • Replies: 0
    • Views: 1,683
    07-10-2009, 12:30 AM Go to last post
  36. Angry Probability Question

    Hi everyone, I have been working on this problem and I think no solution is possible. Please check and see if maybe I am misunderstanding...

    Started by ankitj‎, 07-09-2009 10:22 AM
    • Replies: 2
    • Views: 1,864
    07-09-2009, 12:01 PM Go to last post
  37. If X ≤ Y, then E(X) ≤ E(Y)

    There is a theorem that says: "Let X and Y be random variables. If X ≤ Y, then E(X) ≤ E(Y)." But I don't really understand the meaning of "X ≤...

    Started by kingwinner‎, 07-08-2009 06:20 PM
    • Replies: 3
    • Views: 11,820
    07-08-2009, 09:09 PM Go to last post
  38. Total Probability with Multiple Events

    I assume this is a simple question to answer, but it has been a long time since running through probability questions. I am basically looking for...

    Started by dmurphy48‎, 07-07-2009 07:50 PM
    • Replies: 1
    • Views: 4,114
    07-07-2009, 08:33 PM Go to last post
  39. Cool Probability

    Trying to figure how many ways you can have 4 qualifiers out of a group of 11 if order matters and if order does not matter. Anyone help??? Thanks

    Started by AMG1982‎, 07-06-2009 06:30 PM
    • Replies: 3
    • Views: 2,408
    07-07-2009, 07:58 PM Go to last post
  40. Approximation to Normal Distribution

    here's a question i'm working on: The times of the finishers in a local 10 km run are normally distributed with mean 61 minutes and variance 81...

    Started by yon‎, 07-06-2009 07:28 PM
    • Replies: 2
    • Views: 3,021
    07-07-2009, 12:54 PM Go to last post
  41. Dice Question

    Hey folks, this is a question i'm trying to solve: You roll a die, winning $1 for rolling a 2 or a 4, and $7 for a 6. You lose $2 if the number...

    Started by yon‎, 07-07-2009 01:26 AM
    • Replies: 1
    • Views: 2,129
    07-07-2009, 12:39 PM Go to last post
  42. Log normal distribution

    Hello all, I would like to find a solution to the following problem. Consider I have a variable X log normally distributed with some expected...

    Started by anavia‎, 07-04-2009 03:40 PM
    • Replies: 2
    • Views: 2,674
    07-07-2009, 07:56 AM Go to last post
  43. Need to calculate 'best rated' (i.e. 'most credible') product from some reviews.

    Hi How can we calculate the 'best rated' (i.e. most 'credible') product from review data that consists of a variable number of reviews about...

    Started by shiphen2‎, 07-06-2009 12:14 PM
    • Replies: 1
    • Views: 2,205
    07-07-2009, 12:13 AM Go to last post
  44. Joint and marginal pdf

    Hello everyone. I need help in the following question: Let the joint distribution of X and Y be given as f(x,y)=2*exp{-(x+y)}, 0<x<y</infty a)...

    Started by n00b‎, 07-05-2009 12:16 PM
    • Replies: 0
    • Views: 6,327
    07-05-2009, 12:16 PM Go to last post
  45. Indicated probability

    I need help with this. I have tried this every way I know possible. I know the answer, but can't find out how I actually get it. An airline...

    Started by Michimom0405‎, 07-05-2009 09:28 AM
    • Replies: 1
    • Views: 4,563
    07-05-2009, 10:47 AM Go to last post
  46. independence proof

    Hi, I got this problem about event independence, Let A, B, C are independent, prove or disprove that A U B and C are indepent. I tried to...

    Started by xguo‎, 07-01-2009 10:46 PM
    • Replies: 2
    • Views: 4,560
    07-01-2009, 11:34 PM Go to last post
  47. Number of bit combinations

    Hi, Here's a simple question (sorry, this is probably probability 101, but I am no statistician!) I know that I can make up 2^n different...

    Started by Whalojazz‎, 06-30-2009 07:41 PM
    • Replies: 3
    • Views: 5,451
    07-01-2009, 08:12 AM Go to last post
  48. Sampling Error Probability

    Hello, This is my first time posting here, I stumbled upon this site when I was searching for information on the following problem which I...

    Started by Raven‎, 06-28-2009 09:28 PM
    • Replies: 3
    • Views: 8,025
    06-29-2009, 06:15 PM Go to last post
  49. Excel: Calc Percentiles across multiple years

    Hello all, I am stuck and would love some advice. I am trying to create a graph in Excel that shows the range of a portfolio's value over a 5 year...

    Started by kenadams‎, 06-29-2009 10:25 AM
    • Replies: 0
    • Views: 3,496
    06-29-2009, 10:25 AM Go to last post
  50. 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: 11,901
    06-26-2009, 04:09 PM Go to last post
  51. question on standard deviation?

    hi i missed this on the text. does anyone know how to work this problem on a multiple choice test with 11 question each question has 4...

    Started by chrischemma‎, 06-24-2009 07:05 PM
    • Replies: 2
    • Views: 3,714
    06-25-2009, 12:29 AM Go to last post
  52. 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: 4,883
    06-24-2009, 07:55 PM Go to last post
  53. how to understand this probability

    Suppose there is a conditional probability density function p(x, pi| fi) which is called complete likelihood. This is a conditional joint...

    Started by bobwm‎, 06-22-2009 07:02 PM
    • Replies: 0
    • Views: 2,344
    06-22-2009, 07:02 PM Go to last post
  54. Probability Model Question

    Hi, if you could help me out with the question below I would really appreciate it. Thanks. A quiz consists of three True-False questions. A...

    Started by Aphrodite‎, 06-21-2009 10:39 PM
    • Replies: 0
    • Views: 3,270
    06-21-2009, 10:39 PM Go to last post
  55. a question about normal distribution

    Hi, there, Since I can not edit equation, please see the attachment for it. I can not understand this equation. If it's a normal...

    Started by bobwm‎, 06-21-2009 04:59 PM
    • Replies: 0
    • Views: 2,404
    06-21-2009, 04:59 PM Go to last post
  56. I fit a model now what do I do?

    I have product usage data. Usage is measured in MB transfer, for example. I create a pareto chart of cumulative usage that reveals an exponential...

    Started by rstatistics‎, 06-18-2009 04:08 PM
    • Replies: 0
    • Views: 2,002
    06-18-2009, 04:08 PM Go to last post
  57. Distribution usage..?

    5 games to be played. I want to find out the chances of one of the teams to reach 3 wins Lets say for example that pA=0.45&#37; team's A % of winning...

    Started by pateras34‎, 06-18-2009 02:25 PM
    • Replies: 0
    • Views: 1,910
    06-18-2009, 02:25 PM Go to last post
  58. Mean & SD problems...binomial distribution

    Ok, I'm rolling right along here & looking for some more guidance please :D In Davenport, IA about 56% of the days in a year are cloudy. Find the...

    Started by disgurl‎, 06-17-2009 12:41 PM
    • Replies: 0
    • Views: 2,309
    06-17-2009, 12:41 PM Go to last post
  59. Another binomial problem....tell me if I'm heading in the right direction

    38% of people in the US have type A+ blood. If you randomly select 5 Americans & ask them their blood type, what is the probability that exactly 3...

    Started by disgurl‎, 06-17-2009 11:35 AM
    • Replies: 3
    • Views: 2,138
    06-17-2009, 11:54 AM Go to last post
  60. Binomial random variable question

    I have this question that is driving me batty & I cannot figure it out. I'm taking entry level stats online & have driven to the campus a few times...

    Started by disgurl‎, 06-16-2009 11:26 AM
    • Replies: 5
    • Views: 5,328
    06-16-2009, 09:34 PM Go to last post

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