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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: 30,339
09-30-2005, 09:44 AM
1. ### Round-Off errors

Problem: A set of n numbers are to be added together, and before they are added, each number is rounded off to the nearest integer, thus introducing...

• Replies: 0
• Views: 3,753
04-05-2008, 04:38 PM
2. ### Poisson process

Men, women and children make purchases at a counter in a shop according to independent Poisson processes with rates 10, 12 and 4 purchases per hour...

• Replies: 0
• Views: 2,375
04-05-2008, 02:02 PM
3. ### continuous RV & probability Distributions

:) hi all i m asking for a help actualy i realy didnt understand how does continuous random variable function can anyone pls explain me this or just...

• Replies: 0
• Views: 2,725
kia
04-01-2008, 03:49 AM
4. ### Normal distribution?

i think this is a normal distribution problem. The distribution of sales for a factory has mean 20,000 units per month with a standard deviation...

• Replies: 0
• Views: 1,919
el1
03-31-2008, 09:11 PM
5. ### 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: 5,744
03-31-2008, 06:36 PM
6. ### Freeman-Tukey transformation

Hi everyone. I am pooling proportions for meta-analysis. As part of this project I have been exploring variance stabilizing transformations for...

• Replies: 0
• Views: 8,046
03-31-2008, 12:12 AM

Hi im having trouble with this question. If anyone could help me out thatd be great , Im not sure where to start! Heres info: The cost of...

• Replies: 21
• Views: 6,489
03-30-2008, 10:38 PM
8. ### Which formula?

If a question has given me the mean and standard deviation , what formula should i use?

• Replies: 0
• Views: 3,459
el1
03-30-2008, 10:36 PM
9. ### Need help with this problem asap

1. The average number of calls received by a switchboard in a 30-minute period is 15. What is the probability that between 10:00 and 10:30 the...

• Replies: 0
• Views: 4,531
03-30-2008, 08:44 PM
10. ### Poisson Problem

Can anyone help me with this question?: It is known that the number of persons entering the intensive care unit at a city hospital averages 5 per...

• Replies: 0
• Views: 2,386
03-27-2008, 10:36 PM
11. ### Is this multinomial distribution? Help.

Suppose the random variables X, Y, and Z have the following joint probability distribution. Table below: x y z f(x,y,z) 1 1 1 0.05 1 1...

• Replies: 1
• Views: 3,761
03-27-2008, 09:15 AM
12. ### normal distribution problem

I'm in intro. stats. Help please. Question is: Test scores normally distributed with mean=68.2 and standard deviation=10.4. Estimate probability...

• Replies: 0
• Views: 4,150
03-22-2008, 03:18 PM
13. ### Discrete Density

Let X and Y be independent random variables assumed to be uniformly distributed on {0, 1/2, 1, 2} and { 1/2, 2, 4}, respectively. (a) What is the...

• Replies: 1
• Views: 2,520
03-22-2008, 01:56 AM
14. ### New to Stats

Trying to figure out which type of probability distribution to use on this problem. 48 new cars are shipped to local dealerships. 12 of these have...

• Replies: 2
• Views: 2,254
03-20-2008, 07:55 PM
15. ### Bayes' Theorem

Hi guys, I was hoping somebody might be able to help me with this question. The information I am given: Gamma1 = the risk of disease for...

• Replies: 0
• Views: 2,649
03-20-2008, 07:34 AM
16. ### Weibull problem

Hi all, I have this question on weibull but was not taught weibull in class. The text book didnt offer much weibull examples or solutions as well....

• Replies: 1
• Views: 2,716
03-19-2008, 03:51 PM
17. ### Need help on problem BIG TIME!

Each trading day the value of a particular stock goes up one unit with probability 0.3, stays the same with probability 0.5 or else goes down one...

• Replies: 14
• Views: 3,562
03-18-2008, 11:16 PM
18. ### Poisson distribution and p-value

Does anyone know how to find a general p-value for the poisson distribution. All I have is the expected number of occurrences, given by the poisson...

• Replies: 0
• Views: 7,318
03-18-2008, 01:09 PM
19. ### Need Help on Prob

You are given three coins and told that two of them are biased and that they both have a 60% chance of coming up heads. The third coin is fair. You...

• Replies: 2
• Views: 2,714
03-18-2008, 09:09 AM
20. ### Help On Probablity Immediatly

For a particular brand of popcorn in an air popper, the average number of kernels that fail to pop is 6.8 per cup. a.) Find the probability that 5...

• Replies: 1
• Views: 2,450
03-17-2008, 09:20 PM
21. ### Drawing chips out of a hat Question?

There is 1 blue chip and 5 white chips in a hat. The person drawing the blue chip is the designated driver for the night. No one wants to pick the...

• Replies: 1
• Views: 3,375
03-17-2008, 08:57 PM
22. ### New stats

Hi, new to this thread. I need some help with a stats problem that I recevied in my class. A soft drink bottling company maintains records...

• Replies: 0
• Views: 1,911
03-16-2008, 08:47 PM
23. ### Problem Solving Help

Having trouble solving these problems not sure where to begin, anything will help. I have the answers not sure how to get them. -Suppose you...

• Replies: 0
• Views: 2,276
03-13-2008, 10:37 PM
24. ### Moment generating function?

I need help solving what appears to be a fairly simple problem. Find the moment generating function of : fx(x)=xe^-x Can anyone help me get...

• Replies: 5
• Views: 3,763
03-13-2008, 04:44 PM
25. ### two independent data in normal distribution

Hello, Suppose we have normal distribution of measured data. We know what the standard deviation is for the whole distribution precisely from an...

• Replies: 0
• Views: 2,582
03-13-2008, 02:07 AM
26. ### Probability Question Needed to be Answered

A youth group has eight boys and six girls. If a state of four officers is selected, find the probability that... a.) Three are girls? b.) Two...

• Replies: 1
• Views: 5,657
03-11-2008, 05:49 PM
27. ### Normal Distribution Questions Needed to Answered

Find the area under the normal distribution curve. a.) Above z=1.34 b.) Above z=-1.34 c.) Between z=2.05 and z=1.34

• Replies: 1
• Views: 3,239
03-11-2008, 03:22 PM
28. ### Z Scores Probabilty...Can anyone help?

Hey, Here is the question, I need some serious help!!!! A soft drink machine can be regulated so that it discharges and average of µ per cup. If...

• Replies: 4
• Views: 2,155
03-10-2008, 08:51 AM
29. ### sample space

ok, so in this question, there are 6 people, 2 out of 6 can win the prize in the raffle. People: a,b,c,d,e,f and here is the sample space:...

• Replies: 8
• Views: 3,353
03-09-2008, 08:00 PM
30. ### not a clue

oi oi, hows it all going there is this thing in stats that i do not understand, dunno what it is called but hopefully someone might help if they...

• Replies: 2
• Views: 3,115
03-09-2008, 05:34 PM
31. ### Statistical probability

Hello, I am writing a research paper and have a stats question. It is simple enough. Here is the instrument I am developing. And I...

• Replies: 0
• Views: 1,829
03-09-2008, 02:53 PM
32. ### Loat at Chapter six

Hi there everyone. My name is Katie and i'm algebraeiclly challenged lol. Okay so i thought i understood what was happening up until i got to chapter...

• Replies: 0
• Views: 2,491
03-07-2008, 12:09 PM
33. ### 4th Super Bowl Victory

When the NY Giants won Super Bowl XLII it was their 3rd Super Bowl victory AND it was also the third time that I created a NY Giants billboard in...

• Replies: 0
• Views: 2,245
03-05-2008, 02:06 PM
34. ### Standard Normal Distribution z0

I am a beginning student in Statistics. I don't understand the concept of z0, such as "find z0 such that P( -1.2 < z < z0 ) = 0.8671". It's not...

• Replies: 1
• Views: 6,519
03-05-2008, 01:37 PM
35. ### Homework help

Hi, I don't think this question is designed to be particularly difficult but I'm having trouble with it anyway: A ship arrives at a certain...

• Replies: 2
• Views: 3,122
03-05-2008, 01:16 PM
36. ### 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: 1,906
03-04-2008, 08:33 PM
37. ### 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: 1,646
03-04-2008, 07:46 PM
38. ### Variance of Zero

If you have a variance of zero, will the probability be 100%, 50% or "cannot be determined"? Thanks!

• Replies: 2
• Views: 2,862
03-04-2008, 03:49 PM
39. ### A Two Class Probability Problem

This is a problem that has been bothering me for a while. Say you have 10 'things' and each thing can either be of class A or class B (mutually...

• Replies: 0
• Views: 2,241
03-04-2008, 03:25 PM
40. ### Homework Question

Okay, so I have this question for homework and I really don't know what its asking me...if anyone can put it in layman terms for me I'd be really...

• Replies: 1
• Views: 3,737
03-04-2008, 12:27 PM
41. ### Some questions on Hypothesis, poissson and normal dist...try it

Question 1 Millions of suburban commuters are finding railroads to be a convenient, time-saving, less stressful alternative to the automobile. While...

• Replies: 4
• Views: 4,087
03-03-2008, 01:53 PM

this is the class of test scores of 31 students in a stat class. a) find the mean, median, standard deviation,shape of distribution(symmetric,skewed...

• Replies: 0
• Views: 2,004
03-02-2008, 10:14 PM
43. ### standard normal random variables

I'm stumped on this question: Let Z1, Z2, Z3 be independent standard normal variables identify the distributions of a) (1/2)*(Z1-Z2)^2 b)...

• Replies: 0
• Views: 2,502
03-02-2008, 09:04 PM
44. ### Expected Number of Coin Flips

A coin having probability p of landing heads is flipped 5 times and then flipped utill the pattern of the first 5 flips is observed again for the...

• Replies: 0
• Views: 2,672
03-02-2008, 12:50 AM
45. ### would some one confirm my answers

1-Many universities require a student to take a math placement test as well as computer science placement test.80% of the students who take both...

• Replies: 2
• Views: 2,097
03-01-2008, 05:06 PM
46. ### Need Expert Help: A Blackjack probability question

Hello everyone, If someone wants to take a shot at figuring out the house/player edge in the following two situations, I would really appreciate...

• Replies: 0
• Views: 2,286
03-01-2008, 04:40 PM
47. ### Second opinion?

Ok, this problem looks simple, which is why I am wondering if maybe I have missed something? "Here's an interesting one, not hard but shows how...

• Replies: 1
• Views: 2,099
trd
03-01-2008, 03:45 PM

Here are the questions: 1-5% of the items produced by a machine are defective.of the defective items produced by the machine,70% have minor defectes...

• Replies: 2
• Views: 2,801
02-29-2008, 07:53 PM
49. ### Joint pdf problem

A manufacturer has designed a process to produce pipes that are 10 feet long. The distribution of the pipe length, however, is actually Uniform on...

• Replies: 0
• Views: 3,950
02-28-2008, 02:00 AM
50. ### Help with these two questions, please? I am confused!

Hello Everyone, These are part of my unit on Binomial and Poisson distributions: 1) The average number of phone inquiries per day at the center...

• Replies: 7
• Views: 2,552
02-27-2008, 09:27 PM
51. ### Help please! I can't seem to make sense of these!

A test consists of 10 true/false questions. To pass the test a student must answer at least 6 questions correctly. If a student guesses on each...

• Replies: 1
• Views: 4,275
02-27-2008, 04:34 PM
52. ### Success by chance?

I have a problem where participants had to discriminate two objects, and success was defined was getting 9 correct in a 10 trial run - meaning that...

• Replies: 10
• Views: 3,755
02-27-2008, 11:27 AM
53. ### Real Roots??

:eek: I have no idea where to start on this one If a is uniformly distributed over , what is the probability that the roots of the equation...

• Replies: 0
• Views: 3,021
02-26-2008, 08:56 PM
54. ### sealed bid problem

Your company is making a sealed bid for a construction project. If your firm has the lowest bid, you will pay another firm (a subcontractor) 140...

• Replies: 1
• Views: 4,393
02-26-2008, 05:27 PM
55. ### Batting Average & Probability

A softball team's first 4 hitters are Sam (batting average .500), Gina (batting average .400), Tom (batting average .737), and Kerry (batting average...

• Replies: 1
• Views: 5,319
02-26-2008, 01:43 PM
56. ### Standard deviations and profits?

So this is another question I attempted to solve but was stuck on the 2nd part of it: A store knows that the number of pies sold each day varies...

• Replies: 1
• Views: 5,855
02-25-2008, 01:16 PM
57. ### help

I can not figure this problem out! I don't think there is enough info, but there is an answer in the back: 0.271 The problem: Using Composite...

• Replies: 2
• Views: 5,276
02-25-2008, 01:09 PM
58. ### I think I got it, but then... (A DRINKING GAME!)

400 accidents on a Saturday night were analyzed: Number of vehicles involved & whether alcohol played a role in the accident. The numbers are in the...

• Replies: 3
• Views: 3,196
02-25-2008, 03:19 AM

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