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# Forum: Probability

Probability course and homework discussion. Probability distributions. Probability theory, stochastic processes

1. ### 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)...

• Replies: 0
• Views: 30,322
09-30-2005, 09:44 AM
1. ### 99% Confidence Interval

Hi Guys, I'm stuck and need a little help on this one. I have calculated mean: 74.40 and Std Dev: 12.251 from Population 262, Sample 103. I...

• Replies: 3
• Views: 5,517
01-23-2011, 05:15 PM
2. ### ????HOW to decide Independance of 2 RVs thru joint density without calculation????

given the joint density:f(x,y)=(x+1)(y+1)/8, |x+y|<=1, |x-y|<=1 Find the boundries of the domain of these RVs before any calculations. Are...

• Replies: 0
• Views: 2,019
10-09-2010, 12:07 AM
3. ### A bet between a buddy and I regarding the lottery

Hello all, My coworker is convinced that the Powerball lottery is rigged against those players purchasing more than one game (set of 6 randomly...

• Replies: 8
• Views: 1,893
09-08-2015, 11:23 AM
4. ### a binomial probability question

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

• Replies: 3
• Views: 4,884
12-20-2006, 05:25 PM
5. ### A bouncing ball is giving me fits.

Hi. Thank-you for reading this. My name's Philip Ripper. I'm not a student. I'm a curious person with a fairly poor math education. This is...

• Replies: 6
• Views: 1,610
04-11-2014, 08:53 PM
6. ### A Box containing coins question

If a box contains 4 pennies, 4 nickels, 4 dimes and 2 coins are selected at random WITH replacement and D (>=0) is the numerical difference between...

• Replies: 8
• Views: 2,163
11-25-2013, 04:37 PM
7. ### A box contains 5 tickets

A box contains fives tickets, each with a letter on it: Box : S T A R T Once a day, for n days, a ticket will be drawn at random, with...

• Replies: 1
• Views: 2,984
BGM
05-10-2011, 04:35 AM
8. ### A challenge problem (for me at least)

Hello everyone, this is my first post on this forum. My name is Ryan and I am a first year grad student in electrical engineering at a college in...

• Replies: 1
• Views: 3,645
BGM
10-02-2011, 01:28 AM
9. ### A coin thrown probability question

Hi all I could not explain this question by using "the product rule for independent events" - A coin is thrown four times. What is the probility...

• Replies: 2
• Views: 1,936
12-27-2011, 11:03 AM
10. ### A combinations problem

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

• Replies: 1
• Views: 4,648
01-11-2007, 05:58 PM
11. ### A complex cards off the top of a deck problem

My question is what is the probability of drawing at least one ace and at least one king from the top of a standard deck of cards. This question...

• Replies: 3
• Views: 3,153
07-05-2011, 11:47 AM
12. ### A conditional prob. question

Hi, I need some help regarding the following question. Given three random vectors- A, B,C where A and B are presumably statistically independent....

• Replies: 3
• Views: 3,209
05-27-2007, 01:25 AM
13. ### A contradiction in standard deviation.

Hi there. When calculating the SD of a single spin on a European roulette wheel on a single number one gets: SD = 5.84 when using SD = sqrt...

• Replies: 1
• Views: 2,299
BGM
04-05-2011, 10:08 PM
14. ### A Couple of Questions Re: Birth and Death Processes

Hello, I have a few homework questions regarding birth & death processes (CTMCs) that I'm having trouble solving: 1) Suppose a CTMC has a death...

• Replies: 0
• Views: 2,323
jli
12-06-2014, 04:18 AM
15. ### A Darts Problem

In a game of darts the person that throws first in a leg has an advantage. The players take it in turns to go first. So if we assume Player A has a...

• Replies: 3
• Views: 3,122
BGM
04-25-2010, 02:23 PM
16. ### a defective probability problem

I am trying real hard on solving this problem: A sample of 4 different cell phones is randomly selected from a group containing 15 that are...

• Replies: 5
• Views: 3,104
10-28-2008, 08:47 AM
17. ### a discrete RV pdf

The pdf of a discrete random variable is the following: f(x) = 36/(49x^2), for x = 1,2,3 What is the cdf of x? I'm not sure but I think...

• Replies: 1
• Views: 898
10-03-2012, 10:58 PM

for $1000. For him to share the risk equally with you how much money should he put in escrow for you? Suppose you want him to share half the... • Replies: 2 • Views: 2,780 11-26-2010, 10:06 AM 19. ### A Drunkard's Random Walk Here's a homework problem that I need a hint to get started. D drunkard is taking a random walk. he canstep north or shouth with probability .5... • Replies: 3 • Views: 4,823 10-26-2008, 10:04 PM 20. ### a fair gambling game You want to invent a gambling game in which a person rolls two (unbiased) dice and is paid some money if the sum is 7, but otherwise he loses his... • Replies: 1 • Views: 367 08-06-2017, 05:37 AM 21. ### A Few More Questions... My study group and I are struggling.... 1) A certain lottery has 49 numbers, 6 of which are the winning numbers for a particular game. To play... • Replies: 2 • Views: 2,374 02-21-2006, 02:06 PM 22. ### A game with two dices Imagine a game with two players and referee. The referee rolls two unbiased dices: one of the dices outcome is a score and the other dice outcome... • Replies: 3 • Views: 1,258 01-11-2014, 10:38 AM 23. ### A large and powerful corporation is extorting money from the public. When confronted with ****ing evidence the corporate CEO says these were rogue employees, these were anomalous cases, etc., etc., etc.. . . . ... • Replies: 5 • Views: 2,424 08-07-2011, 09:47 AM 24. ### A little help I know that a event with two outcomes such as making a three throw in basketball doesn't necessarily have a probability of 0.50, it could range... • Replies: 1 • Views: 1,194 05-18-2015, 07:42 AM 25. ### A little help please? This is the final question from my homework and I have been laboring over it for over an hour without much luck. "A certain type of seed has a... • Replies: 1 • Views: 1,769 06-11-2009, 10:28 AM 26. ### A little help with distributions I have been assigned a project that involves statistics and i have no idea about it. I was suppose to capture online game traffi and then using the... • Replies: 8 • Views: 3,435 10-18-2010, 01:07 PM 27. ### A little help with what seems to be conditional probability Hey guys, I want to make sure that I'm working this question correctly. Here goes: A jar has 5 white balls. A ball is taken out randomly - if it's... • Replies: 3 • Views: 1,906 08-26-2013, 04:56 PM 28. ### a little probability question An elevator goes from the ground floor up to the 8th floor (8 floors in total). In the elevator 10 people. Each one of them choose randomly and... • Replies: 2 • Views: 2,412 06-21-2010, 05:24 PM 29. ### A lottery question. So, I'm trying to help out a Euromillions syndicate to understand the probabilities of their different play options. The basic Euromillions lottery... • Replies: 1 • Views: 1,502 BGM 07-11-2012, 03:21 PM 30. ### a low correlation and a strong significance = can the null hypothesis be rejected? I have found that there is a very low negative correlation (r= - 0.17) with strong significance (p<0.0001) between A test and B test. The null... • Replies: 7 • Views: 1,443 04-22-2016, 09:07 AM 31. ### A probability confusion There are two packs of cards. pack A and pack B. A = {11, 12, 13, 15, 19, 20, 22, 23, 24, 25, 26, 27, 28, 29, 31, 32} B = {11. 13. 15. 21. 22, 35}... • Replies: 1 • Views: 2,858 BGM 11-14-2011, 12:03 AM 32. ### a probability problem there are 1000 coins in a bag of which 999 are normal coins (with a head and a tail), and 1 is a freak'' coin which has two heads. if one coin is... • Replies: 1 • Views: 2,526 09-19-2006, 08:17 PM 33. ### Poll: A probability problem Hi all, I would like to solve the problem bellow. To some it might seem to eassy. However i would appreciate some hints. Thanks in advance ... ... • Replies: 7 • Views: 2,738 04-26-2015, 04:51 PM 34. ### A probability question 52 cards, 13 values (A to K) and 4 suits. what's the probability of getting 5 cards with a four-of-a-kind (same value)? My solution: first card... • Replies: 4 • Views: 2,670 BGM 06-28-2010, 01:25 PM 35. ### A probability question A spider eats 3 flies a day. Until the spider fills his quota a fly has a 50% chance of survival if he attempts to pass the web. Assuming 5 flies... • Replies: 1 • Views: 4,467 06-29-2010, 12:59 AM 36. ### A probability question a stick of length 1 is cut twice randomly, probability that 3 segments can form a triangle? x,y, 1-x-y x+y>1-x-y ==> x+y>1/2 1-x-y+x>y ==>... • Replies: 5 • Views: 3,303 BGM 07-16-2010, 12:01 PM 37. ### A probability question I am trying to revise for a test, and am working through some prep questions. I am struggling on this one, could anyone help? Suppose there is a... • Replies: 4 • Views: 1,213 08-22-2012, 08:53 PM 38. ### A probability question Dear all This may be simple for you guys but I would be grateful for some advice on the following: A bus stop layby is only long enough for 2... • Replies: 5 • Views: 1,598 BGM 04-09-2014, 07:50 AM 39. ### A probability/stat elementary problem Hi, I am currently reviewing probabilities on my own and encountered problems which i can't seem to do. Hopefully someone here will be kind enough to... • Replies: 2 • Views: 4,486 01-31-2007, 01:54 PM 40. ### 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). ... • Replies: 0 • Views: 1,916 11-24-2006, 08:00 AM 41. ### 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? • Replies: 0 • Views: 2,318 12-05-2006, 03:44 PM 42. ### A problem about poisson process Hi all, I have a question about the poisson process. Below is the queston: Consider each transition of the poisson process as an event, for... • Replies: 0 • Views: 2,441 04-26-2009, 04:56 PM 43. ### 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...

• Replies: 3
• Views: 2,972
10-30-2006, 03:23 PM
44. ### A Problem on Joint Probability Distribution

Hello people, I found this problem in an exam but i could not go very far on this. Problem: Let X and Y be jointly distributed random variables...

• Replies: 4
• Views: 4,415
07-12-2013, 10:20 PM
45. ### A problem related to Poisson process

Hi all, I have a probability problem. Can you help me? Thank you! Here is the problem: Consider the queueing system, there are n customers 1,...

• Replies: 0
• Views: 1,991
03-19-2009, 12:28 PM
46. ### A problem using Bayes Inference

This is our Master Qualify Exam problem, please help! Thanks! In a large national park, the number of raccoons in a randomly-picked acre is a...

• Replies: 1
• Views: 2,507
BGM
11-14-2011, 12:27 AM
47. ### A Puzzling Probability Problem

Hello everyone. I have encountered these problems. I tried to answer them, but I'm not sure if they are correct.:: I would be very grateful if...

• Replies: 4
• Views: 758
07-09-2017, 04:15 AM
48. ### A puzzling problem

Hello all, I am posting here looking for help on solving a probability problem I have been struggling with for 2 days. It has been several years...

• Replies: 3
• Views: 1,282
04-18-2017, 02:38 PM
49. ### a question

Hi I need an answer Consider N variables uniform distributed over the set 0 and 1. What is the highest expected value among them? Thx, Ori

• Replies: 1
• Views: 2,026
03-21-2011, 08:57 AM
50. ### a question about discrete RV

hello, I have a question about discrete RV. Five fair coins are tossed. The coins that fall on "Head" are removed and the rest of them are tossed...

• Replies: 11
• Views: 1,695
08-08-2014, 07:38 AM
51. ### A question about sampling

Consider two probability distributions, A and B. A has greater variance than B, but A and B have equal means. We are not told anything about their...

• Replies: 13
• Views: 3,740
04-27-2012, 09:52 AM
52. ### A question about the distribution of random numbers - PART II

Thanks to BGM and Dragan, my problem posted under the thread " A question about the distribution of random numbers" now appears to be solved! The...

• Replies: 7
• Views: 1,546
09-20-2012, 05:12 PM
53. ### a question for Makov inequality

Given 0<\lambda<1, can we show \mathrm{P}\le \sum _{i=1}^{n} E/\epsilon^{\lambda}? I think we can get the result by Markov inequality if we know...

• Replies: 3
• Views: 3,554
11-15-2011, 05:49 PM
54. ### A question in order statistics of continuous type distribution

Let X1,X2,… be a sequence of random variables from a continuous type distribution and m and n be two integers such that m<n, and 2≤n−m. How can I...

• Replies: 1
• Views: 1,510
03-30-2014, 11:02 PM

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