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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: 30,373
09-30-2005, 09:44 AM
1. ### Manufacturing machine probability problem

There are three possible environment conditions: normal, rainy and hot. Rainy and hot days may be risky to a system that has been deployed, but...

• Replies: 5
• Views: 3,269
03-06-2016, 02:29 AM
2. ### Astronomer's estimate

I am trying to solve the problem but end up with no where, Please help me to solve the problem Astronomers estimate that as many as one hundred...

• Replies: 3
• Views: 2,559
09-16-2014, 03:59 PM
3. ### Terribly confused-binomial distribution & profit

Would someone kindly take a look at this problem? The link is to the book page in google books. (it is a long problem). I seem to have parts 1 and 2...

• Replies: 0
• Views: 2,208
03-22-2010, 08:19 AM
4. ### Joint Probability

X and Y below are independent: How am I going to solve the joint probability? Am I correct if I solve it this way:

• Replies: 1
• Views: 2,976
03-08-2011, 11:10 AM
5. ### Medals at the Olympics

Hi, I love sports and stats and so I am doing my Olympics research. I saw that there are 2 players from China's on each Badminton competition (MS,...

• Replies: 0
• Views: 1,622
07-05-2016, 04:34 AM
6. ### Travelling

Hi, Still on my quest to sort probabilities problems involving time, I was trying to get help on this: If my car is traveling at 100 km / h in...

• Replies: 2
• Views: 2,455
10-07-2016, 01:36 AM
7. ### Racing

Hi all, I need some help with some statistical work: So, I am trying to understand how I can transform time into probability. I have 2...

• Replies: 0
• Views: 2,134
10-03-2016, 08:48 AM
8. ### Normal Distrubtion question

Hi, I have this question that I can not figure out: Suppose that in an apartment building run by the Probandstat rental company, the inhabitants's...

• Replies: 1
• Views: 3,788
12-04-2010, 04:17 PM
9. ### Probablity

Hi Suppose there are 2000 capsules from Manufacturer A, 3000 capsules from Manufacturer B, and 1000 capsules from Manufacturer C. Each...

• Replies: 4
• Views: 3,612
12-09-2010, 12:08 PM
10. ### Combination permutation

Suppose that from a class of students (of whom 14 are male and 16 are female), a committee of 10 students is chosen at random. The committee then...

• Replies: 0
• Views: 3,301
12-08-2010, 11:23 AM
11. ### Random variable

Suppose that we have a very large collection of marbles, 30% of which are red, 20% of which are green, 40% of which are blue, and 10% of which are...

• Replies: 2
• Views: 3,993
12-09-2010, 11:41 AM
12. ### Marbles ()

Suppose that we have a very large collection of marbles, 30% of which are red, 20% of which are green, 40% of which are blue, and 10% of which are...

• Replies: 0
• Views: 1,995
12-10-2010, 01:28 PM
13. ### Probability WTF??

I am really having trouble with this problem. I need to know what the probability is if a number lies between two numbers. Using the Z-score table. ...

• Replies: 2
• Views: 3,082
11-04-2009, 08:18 PM
14. ### Difference between mean and expected value

Could someone please explain as simply as possible the difference between mean and expected value? Here is my problem: This is for my math stats...

• Replies: 2
• Views: 4,672
12-07-2013, 11:06 AM
15. ### Probability difficulties and Z scores

I am currently grappling with this question: In a certain study the average age was 34.79 years. The SD of age was 14.78. What probability do...

• Replies: 4
• Views: 3,840
02-28-2010, 04:52 PM
16. ### probability of 'wrong-direction' pair

Hello! I have two normal distributions N1, N2 with means m1, m2 and standard deviations s1, s2. Let's say that m1 < m2. If I draw one observation...

• Replies: 3
• Views: 2,280
07-23-2008, 07:47 PM
17. ### Help about Isserlis’ theorem

The Isserlis theorem states that if is a zero mean multivariate normal random vector, then : E = EE + EE + EE Now, in the case x,y,z,t are...

• Replies: 0
• Views: 63,274
01-30-2012, 12:38 PM
18. ### Normal probability question (tough one I think)

What is the probability that a randomly selected sample mean of n=100 will be greater than a randomly selected sample mean of n=1000? I'm not sure...

• Replies: 2
• Views: 2,342
06-27-2008, 01:33 PM
19. ### Hypothesis Testing with proportions

Calculate and interpret the Z-scores to test significant difference between the proportion of rates of dementia between a. 30-49 year-old US men...

• Replies: 0
• Views: 1,232
04-07-2016, 04:30 PM
20. ### Probability Question

I have a short paper due on probability. Here's the info: First, we assume that Alex Rodriguez has four at bats and that the at bats are...

• Replies: 0
• Views: 1,907
03-04-2008, 08:33 PM
21. ### Binary string probability question

Hi, I'm having trouble figuring out this question. I am quite new to probability at this point. Q: How many binary strings of length 2n have...

• Replies: 1
• Views: 3,447
05-25-2009, 06:08 AM
22. ### joint probability questions help?

You were given the following joint probability function for Y1 = { 0, if the child survived, 1, if not, and Y2 = { 0 if no belt used, 1 if adult...

• Replies: 0
• Views: 3,322
09-14-2011, 07:14 PM
23. ### Unit Root

What's this about? I'm new to econometrics and i'm trying to understand this conceptually. I know it has to do with nonstationarity (mean, variance...

• Replies: 0
• Views: 3,528
02-09-2011, 06:14 PM
24. ### probability

This is a part of a problem. I decided to ask it here after hours of trying to solve it... Two tennis players make a match composed of 5 sets....

• Replies: 17
• Views: 7,557
11-30-2005, 04:49 PM
25. ### Probability/Stats help

I wasn't sure what forum to post this is in, its for stats class but it ask for probabilities. A survey measured numbers of hours per month spend...

• Replies: 1
• Views: 2,227
03-09-2011, 01:32 AM
26. ### Conditional probability

Hello, I'm having an issue with a problem. I just have no clue how to solve it. A machine part may be selected from any of three manufacturers...

• Replies: 2
• Views: 1,912
01-16-2016, 10:21 PM
27. ### Fixing the low value and high value in a probabilistic simulation

Hi, When doing repeated random sampling in a monte carlo method, is there a defined procedure to fixing the low value and high value of the...

• Replies: 10
• Views: 2,661
02-23-2017, 03:33 PM
28. ### Proving of probability

Hello! I'm new to this site, so I hope this is the right category to post my question. So here's the deal: in class we get almost only theory, very...

• Replies: 4
• Views: 1,471
11-12-2012, 04:25 PM
29. ### Stuck with a (i think) simple problem

Hi everybody, I have a question here that I'm completely brain frozen with.. (I'm not the youngest anymore, and I can't seem to wrap my brain around...

• Replies: 5
• Views: 1,864
02-05-2015, 01:39 PM
30. ### What's wrong with this sample space?

"A coin is tossed until for the first time the same result appears twice in succession. Describe the sample space." My answer: \Omega :=...

• Replies: 6
• Views: 2,439
08-07-2012, 01:08 PM
31. ### Difficult probability question

I've gotten this off another forum (it hasn't been solved yet), and thought you guys might enjoy this problem. I don't need it solved as it's not my...

• Replies: 7
• Views: 1,894
08-09-2012, 10:20 AM
32. ### Probability and Sampling Distribution Question

Just before a city referendum on a school budget, a local newspaper polls 400 voters in an attempt to predict whether the budget will pass. Suppose...

• Replies: 2
• Views: 5,752
03-31-2008, 06:36 PM
33. ### Help finding a multivariable probability density function?

I'm working on a mathematical modeling problem, where the following diagram will aid my description: http://bnware.ndforums.com/dr_dia.png A...

• Replies: 1
• Views: 997
11-11-2012, 12:55 PM
34. ### Binomial Formula ?

Hi everyone, I'm absolutely going crazy trying to figure this problem out, and I know the answer LOL..I just can't figure out how they got it. Using...

• Replies: 12
• Views: 3,586
10-19-2008, 10:25 PM
35. ### Application of conditional probability with three variables

I have a question concerning the following problem: A hunter has a double-barrelled shotgun. The probability that at least one shot hits the...

• Replies: 0
• Views: 2,166
05-09-2014, 04:45 PM
36. ### Urgent help needed - what is the probability that a student owns both a car and cell?

Hi, I am taking an introductory STAT course at UMN. I can't for the love of anything figure out the probability. Here's the question: Suppose...

• Replies: 1
• Views: 1,530
12-18-2011, 03:17 PM
37. ### Independent events occurring simultaneously

Hey guys, I saw a similar question on the site, but still need some help with my own. Here it is: Consider a double computer intruder detection...

• Replies: 2
• Views: 2,743
10-14-2012, 02:32 PM
38. ### Correlation coeficient(X,rank(X))

Given a sample of size N from a standard normal, I'd like to compute the correlation coeficient(X,rank(X)). So I need the expected value fo X*F(X)......

• Replies: 3
• Views: 1,954
04-09-2013, 05:09 PM
39. ### Combination and Permutation question

Hi guys, I'm new to the field of probability and statistics, I have a question that I can't seem to be able to solve, it would be a great help if you...

• Replies: 2
• Views: 1,460
11-20-2014, 11:03 PM
40. ### Normal Approximation probability question

Consider a four-sided die loaded so that 1 shows 40% of the time. If we roll this die 50,1000,2000,4000,8000 times, find the probability in each...

• Replies: 1
• Views: 2,144
BGM
11-27-2012, 02:52 AM
41. ### Normal Approximation question

1) A fair coin is tossed 600 times. What is the probability that the number of heads will be between 290 and 310? (I have the answer, but I need...

• Replies: 1
• Views: 1,204
BGM
11-26-2012, 04:01 AM
42. ### Probability question!(help on solving!)

A group of 5 co-workers, Tim, Harry, Nina, Brad and Pam contributed to buy a raffle tickets. They won a set of three tickets to an upcoming concert....

• Replies: 1
• Views: 1,426
09-22-2012, 06:45 PM
43. ### Binomial distribution variace q

Given a scenario where there is a true statistic - proportion voting yes in a vote denoted by p ,we sample people from the large population, n . ...

• Replies: 0
• Views: 2,222
09-06-2010, 04:24 PM
44. ### probability question

how do i find the mean and standard deviation? Let the random variable x represent the number of girls in a family of three children. I...

• Replies: 0
• Views: 1,650
03-04-2008, 07:46 PM
45. ### Asynchronis Particle Counting

I have particles incident on a detector at 1000 events/sec. My detector is turning on and off at 1000 e/s bu only for 10% of the time, asynchronis to...

• Replies: 0
• Views: 1,018
02-14-2013, 05:27 PM
46. ### Special Continuous Distributions

I am NOT asking for answers!! Let me make that clear... I'm only asking for help in the method as to solving problems such as these. I missed my...

• Replies: 3
• Views: 5,484
11-03-2010, 06:55 PM
47. ### Question about probability - roulette wheel

Hi there, Have a question about the topic above. I spin a roulette wheel and wait until 31 of the 37 numbers have come up. I then cover the...

• Replies: 6
• Views: 5,204
02-09-2010, 01:23 PM
48. ### Probability Question

An ice cream company makes ice cream bars on sticks which sell for 10 cents. Suppose that the company puts a star on every 50th stick; anyone who...

• Replies: 1
• Views: 2,652
11-14-2016, 08:47 AM
49. ### Umpa Lumpa Backstory ~ Flipping Coins for \$\$\$.

10,000 Umpa Lumpas, are flipping coins in a football stadium. (yes, from Willy Wonka fame, I figured they're tireless workers and enjoy mundane...

• Replies: 3
• Views: 2,240
08-21-2013, 09:40 AM
50. ### 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...

• Replies: 5
• Views: 2,423
02-09-2009, 08:01 PM
51. ### Convergence of random variables

Hi guys, I have two questions that I don't really know how to approach. 1. Consider a random variable Zn = max (1<= k <= n) Xk where Xk is...

• Replies: 1
• Views: 1,987
BGM
09-28-2010, 10:36 AM
52. ### Integrations by part - Expected Value

Hi guys, I need to prove that E = int - int Any starting points ? Thank you!

• Replies: 1
• Views: 2,844
BGM
09-30-2010, 05:00 AM
53. ### Need help with geometric pmf

Hi all, Here's the problem: Let X be the number of accidents per week in a factory. Let the probability mass function of X be f(x) = 1/(x+1) -...

• Replies: 2
• Views: 2,709
09-22-2014, 01:26 PM
54. ### How to find probability in this statistics problem?

We have "N" experiments with YES/NO outcome and in each experiment probability for YES is "p". If in "N-1" experiments we had "m" YES outcomes,...

• Replies: 4
• Views: 3,378
12-14-2010, 12:20 PM
55. ### Learning Probability via a Tutorial Dialogue

Hi, I have set up a web-site on learning basic probability via tutorial dialogues. After an initial quiz, a talking head ("Dr. Brown") will...

• Replies: 0
• Views: 2,697
04-26-2007, 06:26 AM
56. ### Mum's doubt...

Hi, I need some help for my mum... Here's it: How can you calculate k, knowning that X~N(a,b) and P(X>k)=c with c>0.5? :confused: I know that...

• Replies: 0
• Views: 2,161
06-25-2006, 02:56 PM
57. ### Same flat tire

Hello, I am unsure about how to solve this one: It's Friday afternoon and six fraternity brothers at UNC have just attended their last class of the...

• Replies: 7
• Views: 4,614
02-26-2014, 12:24 AM
58. ### Finding probability of left and right handed people

Hello, I am lost on these problems: Assume that 13% of people are left-handed. If we select 10 people at random, answer the following questions: ...

• Replies: 11
• Views: 9,084
10-02-2012, 10:29 AM

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