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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: 30,250
    09-30-2005, 09:44 AM Go to last post
  1. variance of binomial distribution

    The variance of a binomial distribution for which n = 100 and p = 0.20 is this is a practice problem for a test im taking next week. But i don't...

    Started by laneswilets‎, 02-23-2009 08:18 PM
    • Replies: 1
    • Views: 14,503
    02-23-2009, 09:46 PM Go to last post
  2. Need help with lotto problem plz

    Im the Lotto, you may pick six different numbers from the set {1,2,3...,47,48}. If all six of your numbers are picked from 48, you share in a grand...

    Started by nana14‎, 02-23-2009 03:54 PM
    • Replies: 2
    • Views: 2,114
    02-23-2009, 08:35 PM Go to last post
  3. Normal Probability

    My Professor teaches normal probability by using PHSTAT. This is a homework question that I am in need of assistance. A financial analyst states...

    Started by jolena‎, 02-21-2009 10:09 PM
    • Replies: 1
    • Views: 2,743
    02-23-2009, 04:40 PM Go to last post
  4. Unhappy Probabilities...need help fast

    i DONT UNDERSTAND THIS QUESTION.. I MEAN HOW DO I SET THIS UP.. PLEASE HELP ME.. QUESTION.. THE 10YR SURVIVAL RATE FOR BLADDER CANER IS APROX....

    Started by SUNSHINE09‎, 02-23-2009 09:55 AM
    • Replies: 5
    • Views: 2,148
    02-23-2009, 01:12 PM Go to last post
  5. Probability help

    In a survey of 361 people, 28 responded that they had never owned a pet. What is the probability that an individual randomly selected from that group...

    Started by rowdy3‎, 02-22-2009 04:25 PM
    • Replies: 1
    • Views: 2,337
    02-23-2009, 01:11 AM Go to last post
  6. population mean

    100 reporters previewed a movie and were asked to rate it on a numerical scale between 0.1 and 5.0 representing the best rating. The frequency table...

    Started by rowdy3‎, 02-22-2009 04:39 PM
    • Replies: 0
    • Views: 1,929
    02-22-2009, 04:39 PM Go to last post
  7. Calculating probability of a given student major

    First off, this is a homework question. I am completely stuck on this problem and am not sure how to answer the question. We are given a table of...

    Started by hackman2007‎, 02-19-2009 08:23 PM
    • Replies: 5
    • Views: 3,257
    02-21-2009, 09:12 PM Go to last post
  8. Question mathematical stats assignment

    hi my teacher gave an assignment and said "whoever come to me with the proof solved,can get extra marks in the final report".. so help me in...

    Started by lynx17‎, 02-19-2009 03:22 PM
    • Replies: 3
    • Views: 2,645
    02-20-2009, 01:21 PM Go to last post
  9. probabiliry problem under the conditional section

    Please help me to solve this. i dont know where to start. 1)Suppose that in Vancouver,B.C., the probability that a rainy fall day is followed by a...

    Started by i_like_maths‎, 02-20-2009 10:16 AM
    • Replies: 1
    • Views: 5,268
    02-20-2009, 11:12 AM Go to last post
  10. Please HELP ME

    Hello everyone... I really need ur help in solving these questions.. 1) Two cards are randomly drawn from a deck of 52 playing cards. Find the...

    Started by i_like_maths‎, 02-19-2009 09:33 AM
    • Replies: 3
    • Views: 7,754
    02-20-2009, 10:46 AM Go to last post
  11. probability problem, im confused

    When turned on , each of the three switches works properly with 0.8. If a switch is working properly current can flow through it when it is turned on...

    Started by th3plan‎, 02-19-2009 11:48 AM
    • Replies: 1
    • Views: 2,678
    02-20-2009, 07:45 AM Go to last post
  12. Binomial

    The proportion of individuals who favor Party A in the population is 55%. How large must a sample be in order to ensure that 99% of the sample favors...

    Started by jamesmartinn‎, 02-19-2009 12:56 AM
    • Replies: 5
    • Views: 2,975
    02-19-2009, 05:40 PM Go to last post
  13. density function

    I have a problem that says: If U is uniform on , find the density function of U^2. So far I have that F(y)=sqrt(y) Where do I go from there?? I...

    Started by vicky‎, 02-17-2009 04:00 PM
    • Replies: 2
    • Views: 7,190
    02-19-2009, 05:18 PM Go to last post
  14. Exclamation Urgent Help!!

    Good Evening everyone! I am looking for some urgent help on the following questions, so any input would be greatly appreciated. #1. It was...

    Started by Quattro9116‎, 02-17-2009 05:54 PM
    • Replies: 5
    • Views: 2,048
    02-19-2009, 09:38 AM Go to last post
  15. probability problem please help

    A college use two different textbooks during the last semester. During last semester 0.7 students used the text book by Professor B. and 0.3 students...

    Started by th3plan‎, 02-18-2009 12:04 AM
    • Replies: 4
    • Views: 4,769
    02-18-2009, 12:56 AM Go to last post
  16. Profit maximization / Random Variable

    If a store owner defines total daily profit as total revenue from newspaper sales, less total cost of newspapers ordered, less goodwill loss from...

    Started by bholland‎, 02-17-2009 11:40 PM
    • Replies: 0
    • Views: 3,058
    02-17-2009, 11:40 PM Go to last post
  17. variance for 2 random variables

    Studying for an intro course test and I have no one to compare it to right now.. any help would be appreciated. Here is the question. Q....

    Started by hanelliot‎, 02-15-2009 04:54 PM
    • Replies: 3
    • Views: 8,712
    02-16-2009, 09:52 PM Go to last post
  18. Exclamation Business Stats question...desperate for help

    My professor has assigned this problem and I have no idea what else to try. I have tried binomial distributions and poisson. It is in a chapter on...

    Started by rmevans1‎, 02-16-2009 09:19 PM
    • Replies: 1
    • Views: 7,914
    02-16-2009, 09:44 PM Go to last post
  19. What minimum sample size should relfect the distribution of the overall population

    If I have exam grades for a large population (2500), what is the minimum sample/class size for which I can expect the distribution of grades for the...

    Started by cmccandless‎, 02-16-2009 01:05 PM
    • Replies: 0
    • Views: 3,539
    02-16-2009, 01:05 PM Go to last post
  20. How can I estimate the traffic

    Hi, I'm trying to make some computer system load estimations, but I'm not sure I have all the data I need for that. I have a machine that will...

    Started by comopasta‎, 02-16-2009 03:02 AM
    • Replies: 1
    • Views: 2,649
    02-16-2009, 10:14 AM Go to last post
  21. correlation and covariance

    1) Suppose that two random variables X & Y are jointly distributed according to the pdf f(x,y)=8xy , 0<=y<=x<=1. What is the correlation coefficient...

    Started by thandu3‎, 02-14-2009 11:16 PM
    • Replies: 2
    • Views: 4,846
    02-15-2009, 10:59 AM Go to last post
  22. can you get probability simply from a percentage?

    I have this problem I'm trying to figure out regarding discrete probability distributions. If I have a percentage of either successful or failed...

    Started by Joia‎, 02-14-2009 05:35 PM
    • Replies: 5
    • Views: 4,367
    02-14-2009, 10:50 PM Go to last post
  23. indicator variables

    Hi, studying for a test and registered to ask some questions.. Q) X and Y are indicator variables for events A and B. State whether XY is an...

    Started by hanelliot‎, 02-14-2009 03:31 PM
    • Replies: 1
    • Views: 3,356
    02-14-2009, 08:31 PM Go to last post
  24. Bivariate normal

    Hi, Need some help getting started with an assignment question. We have to independant distributed random variables, X~N(10,3) and Y~N(15,24)....

    Started by nils‎, 02-14-2009 10:01 AM
    • Replies: 2
    • Views: 2,887
    02-14-2009, 12:07 PM Go to last post
  25. normal density function

    I am having trouble getting started on this problem..my textbook doesn't give a similar example for me to follow. Here is the question: Calls made...

    Started by laneswilets‎, 02-13-2009 08:39 PM
    • Replies: 3
    • Views: 2,567
    02-13-2009, 10:57 PM Go to last post
  26. p(r)binomial

    I'm trying to figure out the probability that r=6 machines out of a sample size of n=26 would fail, given an expected failure rate in a large...

    Started by hargood‎, 02-13-2009 12:08 PM
    • Replies: 3
    • Views: 2,727
    02-13-2009, 12:49 PM Go to last post
  27. Expected number of comparisons

    Hi everyone, I have the following simple program for finding the maximum of a given set L of integers while L not empty do choose y...

    Started by tah‎, 02-11-2009 11:20 PM
    • Replies: 3
    • Views: 2,529
    02-13-2009, 10:26 AM Go to last post
  28. Confirmation?

    Just wrote an exam, was able to copy down the questions along with my answers. I don't need you to solve them, but just to clarify some things. 1)...

    Started by jamesmartinn‎, 02-13-2009 09:26 AM
    • Replies: 2
    • Views: 2,418
    02-13-2009, 10:17 AM Go to last post
  29. simple stats question

    In an experiment a six-sided die is rolled a number of times. The results are shown below. Die Results 1 6 2 7 3 6 4 3 5 9 6 5

    Started by djones042‎, 02-12-2009 02:34 PM
    • Replies: 3
    • Views: 2,457
    02-13-2009, 01:26 AM Go to last post
  30. Help on Stats Assignment!

    hey guys, In the town of Dumparonster it is well known that garbage must be out by 8am each Monday morning and that each house in the town has a...

    Started by strongt‎, 02-11-2009 08:00 PM
    • Replies: 2
    • Views: 2,437
    02-12-2009, 12:19 PM Go to last post
  31. Variance / SD question

    Apologies for what I imagine is a basic question, but I am doing some independent research and just looking to get a 'thumbs up' and confirmation for...

    Started by EmilyKe11‎, 02-05-2009 02:56 AM
    • Replies: 3
    • Views: 1,778
    02-11-2009, 05:06 AM Go to last post
  32. Forecasting help needed for google

    Can someone help me with the formula I'd need in order to forecast search results? Here's the problem: Month 1: variable A increases from rank...

    Started by AnthonyM‎, 02-10-2009 02:25 PM
    • Replies: 2
    • Views: 2,343
    02-10-2009, 07:04 PM Go to last post
  33. a short one

    Hi guys, I'm new to this forum, and perhaps there already exist an answer to this question. Anyway here I go, I have an assignment in...

    Started by dhl‎, 02-07-2009 01:45 PM
    • Replies: 5
    • Views: 2,407
    02-09-2009, 08:01 PM Go to last post
  34. help?

    11.32: To estimate the mean height u(mew) of male students on your campus, you will measure an SRS of students. You know from gov't data that the...

    Started by california7‎, 02-08-2009 07:22 PM
    • Replies: 2
    • Views: 6,481
    02-09-2009, 04:08 PM Go to last post
  35. conditional expectation and variance

    Hi there, Suppose X~Exp(lam). We have a sample from X of size n. Knowing that the data follow the exponential diastribution, we fit the...

    Started by leo nidas‎, 02-09-2009 12:12 PM
    • Replies: 4
    • Views: 4,649
    02-09-2009, 01:54 PM Go to last post
  36. X + a log X, where X~Gamma

    Does anybody know anything about the distribution of X + a log X, where X is a gamma distributed random variable and a is constant?

    Started by pnoviko‎, 02-08-2009 11:29 AM
    • Replies: 7
    • Views: 3,968
    02-09-2009, 12:45 PM Go to last post
  37. Help PLZ in probabilites

    Consider 4 machine components A,B,C and D with configuration as given below in a machine which produces text books. If each component is independent...

    Started by strongt‎, 02-08-2009 11:10 PM
    • Replies: 4
    • Views: 2,070
    02-08-2009, 11:54 PM Go to last post
  38. Simulating Families of 4 Children and 5 Children

    Using Excel Please help me to solve the following: 1). Estimated the probability of getting exactly 3 girls in a family of 4 children. Develop a...

    Started by Thakur‎, 02-07-2009 04:26 PM
    • Replies: 1
    • Views: 4,397
    02-08-2009, 11:52 AM Go to last post
  39. Exclamation variance of random variable

    Hello i m new here,just searched out and find this knowledgeable forum. My teacher has given and assignment to prove the relation of variance...

    Started by lynx17‎, 02-07-2009 08:42 AM
    • Replies: 1
    • Views: 2,606
    02-07-2009, 12:19 PM Go to last post
  40. help finding the poisson probabilities in this problem

    ive got a word problem a need verification and help with the last part with, here it is: the number of flaws on a magnetic VHS tape produced at a...

    Started by subopolois‎, 02-04-2009 11:12 PM
    • Replies: 3
    • Views: 4,279
    02-06-2009, 07:00 PM Go to last post
  41. conditional probabilities

    P(A)= 0.3 P(B)= 0.5 find P(A union B) if: a) P(B|A)= 0.25 b) A is a subset of B i just need hints to solving these two, not looking for the...

    Started by subopolois‎, 02-04-2009 11:30 PM
    • Replies: 2
    • Views: 2,036
    02-06-2009, 04:12 PM Go to last post
  42. Please Help

    The daily return of a certain stock is normally distributed with a mean of 0.30% and a standard deviation of 2.50%. 1. Find the probability that...

    Started by jhingi‎, 02-05-2009 04:56 PM
    • Replies: 1
    • Views: 2,701
    02-06-2009, 01:32 PM Go to last post
  43. Will someone please help a lost Engineer?

    I am trying to finish my thesis for my Masters in Civil Engineering and have run into a statistics/ probability question which my one Engineering...

    Started by Civil Eng.‎, 02-05-2009 12:20 AM
    • Replies: 6
    • Views: 2,757
    02-05-2009, 06:45 PM Go to last post
  44. joint density, change of variables

    Need help with understanding. Two independent points dropped randomly on the interval. What is the density function of their distance x-y. I tried...

    Started by gekahelf‎, 02-02-2009 04:40 PM
    • Replies: 4
    • Views: 3,859
    02-05-2009, 10:38 AM Go to last post
  45. probability using combinations/permutations

    a student has an exam, the teacher gives 30 questions and 10 of the 30 will be on the final exam. if the student knows how to solve 25 of the 30,...

    Started by subopolois‎, 02-04-2009 11:33 PM
    • Replies: 1
    • Views: 5,131
    02-05-2009, 01:08 AM Go to last post
  46. Cool Distribution of Sum of Independent Random Variables Having Chi-square Distributions

    Hey... Ive been asked to Prove or show that one of the properties of the Chi-square distribution is true and I have no idea how to even get started....

    Started by StatisticallySignificant‎, 02-03-2009 10:31 PM
    • Replies: 1
    • Views: 6,594
    02-04-2009, 09:13 PM Go to last post
  47. stochatische prozesse

    Hi, I was studying for my Stochastische Prozesse (german, I donīt know the name in english), examen and I came around this problem for conditional...

    Started by stoch.Prozesse‎, 02-03-2009 03:06 PM
    • Replies: 0
    • Views: 1,968
    02-03-2009, 03:06 PM Go to last post
  48. Expectd Value for ranges

    I hope someone can help me with this expected value question: Total Number of Admissions/Probability 950,000 to 1,050,000/ ...

    Started by coststats‎, 02-02-2009 11:48 PM
    • Replies: 2
    • Views: 2,647
    02-03-2009, 02:34 PM Go to last post
  49. calculating expectation and variance

    Hi, I wanted to know if i'm on the right track with this problem. So far, for expectation I multiply 15/60 and 12. Not sure if this is correct....

    Started by Andiem‎, 02-01-2009 02:00 PM
    • Replies: 4
    • Views: 5,121
    02-01-2009, 02:17 PM Go to last post
  50. Poisson generation query

    Hello all, (Apologies if this question is naive/obvious - I don't have much of a background in statistics/probability :() Here goes..... Say I...

    Started by engineerinstatland‎, 01-30-2009 12:25 PM
    • Replies: 0
    • Views: 1,771
    01-30-2009, 12:25 PM Go to last post
  51. how many combinations ?

    4 numbers with each can be from 1 to 49. e.g. 1,2,3,4 1,2,3,5 1,2,3,6 1,2,3,7 but exclude depublication that is 2,1,3,4 or...

    Started by computeruser08‎, 01-29-2009 06:53 PM
    • Replies: 4
    • Views: 3,934
    01-29-2009, 10:02 PM Go to last post
  52. Are distributions the "same" in their extreme values?

    Hello, I have two independent datasets which are measurements of the height of ocean waves. I would like to tell if these datasets have the same...

    Started by KE2‎, 01-29-2009 10:06 AM
    • Replies: 3
    • Views: 3,637
    01-29-2009, 02:23 PM Go to last post
  53. need push in the right direction (markov chain)

    i have done almost every question on the first chapter but the proofs on question 26,and 27 have me lost. i need help

    Started by colltie‎, 01-28-2009 11:26 AM
    • Replies: 0
    • Views: 2,107
    01-28-2009, 11:26 AM Go to last post
  54. positions of letters in texts (coincidence?)

    Hi everyone. Please excuse this stupid question but here it is anyway: What are the chances of the following occourring in a book? On page...

    Started by chukabuka‎, 01-23-2009 06:44 PM
    • Replies: 2
    • Views: 2,512
    01-28-2009, 07:39 AM Go to last post
  55. Red face pmf and cdf setup

    I'm having trouble with the initial setup. Could you help me construct a probability mass function? A fair coin is tossed three times. A player...

    Started by linjen31‎, 01-28-2009 12:15 AM
    • Replies: 1
    • Views: 5,389
    01-28-2009, 03:46 AM Go to last post
  56. Post Probability Problem

    William rolls a die. If he gets an even number he flips a coin. If he gets an odd number, he rolls the die again. How many possible outcomes are...

    Started by GymMomx2‎, 01-27-2009 10:15 PM
    • Replies: 0
    • Views: 2,204
    01-27-2009, 10:15 PM Go to last post
  57. Selection w/o replacement, prob. of nth selected being mth of a set

    Here's the problem, and the solutions I've attempted and come up with: In a string of 12 christmas tree lights bulbs, 3 are defective. The bulbs...

    Started by omdown‎, 01-25-2009 09:02 PM
    • Replies: 1
    • Views: 4,634
    01-26-2009, 10:31 PM Go to last post
  58. Help, please, with probability calculation in the case of a random walk of a price

    Hi! I have a very specific question in calculating, having a formula or else, of the probability of a price reaching certain level. The problem is...

    Started by kubrat‎, 01-25-2009 10:37 PM
    • Replies: 1
    • Views: 3,051
    01-25-2009, 11:19 PM Go to last post
  59. 2 randomly selected have same birthday

    Please help to answer the following question with detailed steps: What is the probability that two randomly selected people have the same...

    Started by Thakur‎, 01-24-2009 02:32 PM
    • Replies: 2
    • Views: 6,479
    01-24-2009, 06:51 PM Go to last post
  60. Trying to help out a teacher with this

    My neighbor is an elementary school teacher and asked for my help with this, but I haven't done a math problem like this in years! She's grading...

    Started by Kshow‎, 01-24-2009 04:59 PM
    • Replies: 1
    • Views: 2,411
    01-24-2009, 05:43 PM Go to last post

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