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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: 30,406
09-30-2005, 09:44 AM
1. ### help with simple probability problem

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

• Replies: 0
• Views: 1,988
01-13-2007, 05:55 PM
2. ### 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: 6,404
01-13-2007, 12:58 PM
3. ### 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: 2,696
01-13-2007, 08:47 AM
4. ### 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: 2,969
01-12-2007, 07:41 PM
5. ### 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: 8,109
01-12-2007, 07:30 PM
6. ### 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: 4,399
01-12-2007, 06:47 PM
7. ### 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: 4,670
01-11-2007, 05:58 PM
8. ### 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: 2,469
01-10-2007, 04:06 PM
9. ### 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: 1,764
01-09-2007, 02:03 PM
10. ### 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: 2,015
01-02-2007, 05:54 PM
11. ### statistics/ regression line. I started, im stuck

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

• Replies: 0
• Views: 2,360
12-29-2006, 11:10 AM
12. ### 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: 2,918
12-27-2006, 07:16 AM
13. ### 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: 1,809
12-27-2006, 03:19 AM
14. ### 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: 2,824
12-27-2006, 12:20 AM
15. ### 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: 1,903
12-21-2006, 06:33 PM
16. ### 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: 4,926
12-20-2006, 05:25 PM
17. ### 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: 2,657
12-19-2006, 06:06 AM
18. ### 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: 2,478
12-19-2006, 05:39 AM
19. ### 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: 3,889
12-19-2006, 05:01 AM
20. ### 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: 3,195
12-18-2006, 04:06 PM
21. ### 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: 2,413
12-14-2006, 02:00 PM
22. ### 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: 4,073
12-14-2006, 02:25 AM
23. ### 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: 2,624
12-13-2006, 12:46 PM
24. ### 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: 2,703
ssd
12-13-2006, 06:35 AM
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: 3,294
ssd
12-13-2006, 06:26 AM
26. ### 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: 2,314
12-12-2006, 02:24 PM
27. ### 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: 2,200
12-11-2006, 09:26 PM
28. ### 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: 5,281
12-11-2006, 08:32 PM
29. ### 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: 3,183
12-11-2006, 12:46 AM
30. ### 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: 2,291
12-11-2006, 12:40 AM
31. ### 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: 2,745
12-11-2006, 12:34 AM
32. ### 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: 3,757
12-10-2006, 08:05 PM
33. ### 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: 6,946
12-07-2006, 07:54 AM
34. ### 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: 2,334
12-05-2006, 03:44 PM
35. ### 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: 2,921
12-05-2006, 09:25 AM
36. ### 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: 7,801
12-04-2006, 11:02 PM
37. ### 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: 2,385
12-04-2006, 04:15 PM
38. ### 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: 2,738
12-04-2006, 04:11 PM
39. ### 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: 2,961
12-04-2006, 04:50 AM
40. ### Probability Question

I think I figured this one out. Thanks.

• Replies: 3
• Views: 2,213
12-04-2006, 01:19 AM
41. ### 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: 2,259
12-02-2006, 07:04 PM
42. ### 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: 4,440
11-30-2006, 04:01 PM
43. ### 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: 7,663
11-28-2006, 09:11 AM

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: 3,066
11-28-2006, 01:33 AM
45. ### Homework Question

kkkkkkkkkkkkkkkkkkkkkkkkk

• Replies: 0
• Views: 3,483
11-27-2006, 09:07 PM
46. ### 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: 2,001
11-27-2006, 05:42 PM
47. ### 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: 3,089
11-25-2006, 11:35 AM
48. ### Birthday problem

ignore this, I have solved the problem

• Replies: 0
• Views: 2,468
11-25-2006, 12:52 AM
49. ### Variance and correlation coefficient

Nothing to see here :)

• Replies: 1
• Views: 2,234
11-24-2006, 12:15 PM
50. ### 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: 1,918
11-24-2006, 08:00 AM
51. ### Determining the test to be applied

Find the 96% confidence limits for the true mean weekly study time of students if a sample of 25 had an average of 20 hrs per week and a sd of 3 hrs.

• Replies: 3
• Views: 1,770
11-22-2006, 11:20 AM
52. ### Need some homework help. (work provided)

Hey guys my current book I am using is statistics and the author is weiss just fyi. I am real confused about a concept. here is the question. ...

• Replies: 1
• Views: 2,751
11-22-2006, 11:15 AM
53. ### Expected value of X

R.V. X, given E(x+4)=10 and E=116, determine: Var(X+4); E(X)=mu Var(X)=sigma^2

• Replies: 2
• Views: 4,325
11-22-2006, 05:58 AM
54. ### I'm very confused...(Normal Distribution)

Hi people...I really should of come here sooner to try and ask for help, but I just kept letting myself sink deeper and deeper... Now I have some...

• Replies: 4
• Views: 3,210
11-21-2006, 11:14 PM
55. ### Planting Flowers

Four triangular gardening plots form a square as shown. Each plot will contain one kind of flower, and flowers in plots that share an edge will be...

• Replies: 0
• Views: 2,260
11-21-2006, 04:49 PM

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