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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: 30,311
09-30-2005, 09:44 AM
1. ### Variance and correlation coefficient

Nothing to see here :)

• Replies: 1
• Views: 2,228
11-24-2006, 12:15 PM
2. ### Birthday problem

ignore this, I have solved the problem

• Replies: 0
• Views: 2,443
11-25-2006, 12:52 AM
3. ### Kurtosis Central limit vs No central limit

Hi, I am discovering that certain softwares report different measures for kurtosis. Mainly the central limit kurtosis and non central limit...

• Replies: 0
• Views: 3,075
11-25-2006, 11:35 AM
4. ### Probability question

In a large area 70% of the people live in suburb, the rest in the city: out of those who live in suburban areas. 20% work for fast food resaurants. ...

• Replies: 2
• Views: 1,995
11-27-2006, 05:42 PM
5. ### Homework Question

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• Replies: 0
• Views: 3,463
11-27-2006, 09:07 PM

I'm stuggling with these problems (I'm not really sure how to set them up). I'll really appreciate the help, thanks in advance =) 1)The...

• Replies: 2
• Views: 3,050
11-28-2006, 01:33 AM
7. ### Homework Question Need Help ASAP

I have a homework problem that I am really stuck on and unfortunately it is due by wednesday so I am hoping someone can help me out. Here it goes: ...

• Replies: 1
• Views: 7,630
11-28-2006, 09:11 AM
8. ### using wrong distribution

A small simple random sample is selected from a normally distributed populations for which population variance unknown. Construction of a confidence...

• Replies: 3
• Views: 4,404
11-30-2006, 04:01 PM
9. ### Probability Help

I'm having trouble solving this question, I'll really appreciate your help. Thanks so much! If two cards are drawn at random from an ordinary deck...

• Replies: 3
• Views: 2,251
12-02-2006, 07:04 PM
10. ### Probability Question

I think I figured this one out. Thanks.

• Replies: 3
• Views: 2,201
12-04-2006, 01:19 AM
11. ### how to show median of uniform sample converges to 1/2 a.s.

Let X(1), X(2),... X(2n+1) be independent identically distributed U random variables. Define M(n) is the median of them.show that M(n) converges...

• Replies: 1
• Views: 2,947
12-04-2006, 04:50 AM
12. ### help me

can any bady help me to solve this problem :confused: Problem 1: An airline finds that 4 percent of the passengers that make reservations on a...

• Replies: 6
• Views: 2,725
12-04-2006, 04:11 PM
13. ### Binomail question

Can you tell me what I'm doing wrong? If I'm rolling exactly 2 threes in 5 rolls of a fair die, would I not: n!/k! (n-k)! and this would be...

• Replies: 2
• Views: 2,380
12-04-2006, 04:15 PM
14. ### Expected value, variance, standard deviation

I am kind of stuck :confused: Problem: A random variable X has the distribution: px = ( 0 1 2 4 ) ...

• Replies: 3
• Views: 7,749
12-04-2006, 11:02 PM
15. ### probability

I'm very confused on where to start on my statistics project. I need help please. It says: "a woman has her purse stolen in LA by a young blonde...

• Replies: 1
• Views: 2,898
12-05-2006, 09:25 AM
16. ### 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: 2,316
12-05-2006, 03:44 PM
17. ### Random Variable Probability HW Help.

I am lost due to the fact that extra information was provided. An investor plans to invest \$50,000 in one of four investments. The return on each...

• Replies: 3
• Views: 6,888
12-07-2006, 07:54 AM
18. ### stat example

Hi, I'm working on a problem and I'm stuck. Can anyone please guide me through this? Thanks! After meeting with the regional sales managers,...

• Replies: 1
• Views: 3,730
12-10-2006, 08:05 PM
19. ### Interesting Probability Question

A baker who makes bread daily sells an average of five breads a day. How many breads should he make each day so that the probability of running out...

• Replies: 1
• Views: 2,727
12-11-2006, 12:34 AM
20. ### Normal Distribution

Known that 15 % of all homeowners pay a montly mortgage of more than 2500 and that the standard deviation of the montly mortgage payments of ALL...

• Replies: 1
• Views: 2,276
12-11-2006, 12:40 AM
21. ### Expectation law

If I know distribution of x and know distribution of y. How do I find expected value for z if z=xy?

• Replies: 1
• Views: 3,159
12-11-2006, 12:46 AM
22. ### need help

hey kind people, i got some problems from my statistics assigment that i dont understand (couldnt get this 4 out of 15), so if you can give me...

• Replies: 2
• Views: 5,227
12-11-2006, 08:32 PM
23. ### Need Probability Help FAST

I have a test on Thursday and i can't figure out the homework for the life of me. I got an A on the first test but now Im just confused. Help PLEASE.

• Replies: 1
• Views: 2,190
12-11-2006, 09:26 PM
24. ### Probability Help!

:confused: It is known that 30% of the patients who have a certain ear diease will eventually lose their hearing ability. In a smaple of 15...

• Replies: 2
• Views: 2,308
12-12-2006, 02:24 PM
25. ### I Need Help Fast

I HAVE AN EXAM ON WEDNESDAY AND CANNOT FIGURE OUT THESE TWO PROBLEMS FOR THE LIFE OF ME. IS THERE ANY WAY SOMEONE CAN TELL ME HOW TO DO THEM! 1. A...

• Replies: 7
• Views: 3,285
ssd
12-13-2006, 06:26 AM
26. ### Deriving probability distribution

I've got a dataset of electricity prices for in New York City for the past five years. Surprisingly, prices can be both negative and positive (don't...

• Replies: 1
• Views: 2,673
ssd
12-13-2006, 06:35 AM
27. ### A Tuberculosis Test....

:confused: A Tuberculosis Test is given to a sample of 3 TB patients. The test will detects the diease 95% of the time. Let y denote a positive...

• Replies: 2
• Views: 2,611
12-13-2006, 12:46 PM
28. ### Probability of being dealt a card

This is not for a homework assignment, rather for my general knowledge. I'm having trouble calculating the percentages of being dealt one of several...

• Replies: 1
• Views: 4,030
12-14-2006, 02:25 AM
29. ### second sig leve prob/ pls tell me if my answer is correct

QUESTION: Fifteen students are randomly assigned to three different instructional methods for teaching statistics. At the end of the course,...

• Replies: 0
• Views: 2,382
12-14-2006, 02:00 PM
30. ### Marbles

I really suck with probability questions...can someone help me out here? Each of two boxes contains 20 marbles, and each marble is either black or...

• Replies: 1
• Views: 3,175
12-18-2006, 04:06 PM
31. ### random walk

maybe you can help me... i've a theoretical problem: let X_n be a random walk over Z defined by For l,m in Z let

• Replies: 1
• Views: 3,863
12-19-2006, 05:01 AM
32. ### No of ways

There are 5 women and 5 men. If a committee of four is chosen, find the number of ways that at least 2 women are chosen? the first card is 5...

• Replies: 1
• Views: 2,460
12-19-2006, 05:39 AM
33. ### Urgent:Three Independent Identically Distr. Geo.Rand Variables...Not a clue.

Hi everyone, this is my first time posting. Hopefully, I haven't managed to break one of the rules on my first time out, but it does happen....

• Replies: 1
• Views: 2,648
12-19-2006, 06:06 AM
34. ### 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: 4,879
12-20-2006, 05:25 PM
35. ### probability for "identity"

In a new show on tv, a contestant has to guess the identity of 12 strangers. To win the grand prize the contestant has to guess all twelve. I...

• Replies: 2
• Views: 1,891
12-21-2006, 06:33 PM
36. ### Binomial probablity

According to National Highway traffic Safety Administration 66% of California motorists use seat belts. Find the probablity that in one group of 12...

• Replies: 1
• Views: 2,812
12-27-2006, 12:20 AM
37. ### one more probability question...

A non fair coin fell on "Head" with probability p and on Tail with probability q=1-p. Let Pn be the probability that in n throws of the coin there...

• Replies: 0
• Views: 1,801
12-27-2006, 03:19 AM
38. ### Fair Coins and Dices

hello, I need a wee help with this probability problem... A fair dice is thrown until 'H' turnes up for the first time. Let N be the number of...

• Replies: 1
• Views: 2,904
12-27-2006, 07:16 AM
39. ### statistics/ regression line. I started, im stuck

sorry i posted the wrong message and needed to delete it.

• Replies: 0
• Views: 2,345
12-29-2006, 11:10 AM
40. ### A simple expectation problem!

guys, consider we have N numbers (no equal numbers). we want to find the maximum of these numbers. The method is like this... I choose one of...

• Replies: 0
• Views: 2,001
01-02-2007, 05:54 PM
41. ### Probability

Hi guys I have 2 probability questions a. An impounding reservoir is designed so as to have sufficient capacity to meet the water requirements of a...

• Replies: 0
• Views: 1,755
01-09-2007, 02:03 PM
42. ### Gumbel distribution

I have another one for you guys. Am still trying to figure out the other ones. 1. The problem statement, all variables and given/known data The...

• Replies: 0
• Views: 2,460
01-10-2007, 04:06 PM
43. ### 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: 4,644
01-11-2007, 05:58 PM
44. ### Multiple poisson versus one poisson for different arrival types

I am trying to model guest arrivals at a restaurant with exponentially distributed times between arrivals. Arrivals can consist of different party...

• Replies: 1
• Views: 4,377
01-12-2007, 06:47 PM
45. ### Geometric Probability

Can someone help me with this problem and check my answer.. (I know its a long read but the questions are not hard) Mr. Nedrdly, the long time ap...

• Replies: 1
• Views: 8,089
01-12-2007, 07:30 PM
46. ### Expectation/Population Mean

I'm working on a question where 6 balanced coins and 2 balaned diced are tossed together. Z= sum of the scores on dice and number of heads. I have...

• Replies: 2
• Views: 2,957
01-12-2007, 07:41 PM
47. ### Normal Distribution question

Help help i have a test on monday and i know nothing!!! I am doing these questions and i have stumbled upon a pickle... The heights of girls of a...

• Replies: 3
• Views: 2,682
01-13-2007, 08:47 AM
48. ### Help with these probability problems

1. Conditional Prob: Approximately 1/125 of all births are fraternal twins and 1/300 of births are identical twins. Elvis Presley had a twin brother...

• Replies: 1
• Views: 6,366
01-13-2007, 12:58 PM
49. ### help with simple probability problem

see other thread - couldn't find how to delete this message - sorry

• Replies: 0
• Views: 1,977
01-13-2007, 05:55 PM
50. ### help with simple (i think) probability problem

Given two possible outcomes with different probabilities (say, a 10% chance I will break my leg if I jump off the roof and a 90% chance that I will...

• Replies: 1
• Views: 2,632
01-15-2007, 12:43 AM

Hello, I'm having a lot of trouble with this problem, and it doesn't seem like it should be difficult. A bowl contains 20 cherries, exactly 15...

• Replies: 1
• Views: 3,151
01-17-2007, 12:31 AM
52. ### Roulette Question

I am really stuggling with this....please help The game of American Roulette is played on a whele which consists of 38 slots, each with its...

• Replies: 4
• Views: 3,149
01-17-2007, 12:39 PM
53. ### Joint probability

Hi, I have this problem I can't think of any way to solve this. A recent survey examined the working arrangements of married households. It was...

• Replies: 0
• Views: 3,107
01-17-2007, 06:47 PM
54. ### Normal Curve

Calculate the standard score of the given X value, X=61.6 where mu=66.7 and standard deviation is 65.2 I got a negative score of .078, that can't...

• Replies: 1
• Views: 4,247
01-19-2007, 10:08 PM
55. ### Conditional Probability

Hello, i am a tad confuzzled with conditional probability. I have a question i am half way through and i have hit a brick wall. It is given that:...

• Replies: 3
• Views: 3,335
01-20-2007, 09:44 AM

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