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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: 30,326
09-30-2005, 09:44 AM
1. ### Guidance

Hi, Can someone please send me in the right direction with this problem? I think it is to do with the random variable??? The president of an...

• Replies: 1
• Views: 3,924
06-03-2007, 05:54 PM
2. ### probabilty- setting up variables...(high school)

i have a quick question. here's the problem From past experience, Stephane Voiture, manager of sales at Downsview Motors, knows that 10% of...

• Replies: 0
• Views: 1,958
06-04-2007, 08:50 AM
3. ### Looking for contributors

Do you have a background or interest in math or statistics? Do you enjoy helping people, especially beginners, understand a complex concept? ...

• Replies: 0
• Views: 3,262
06-07-2007, 09:56 PM
4. ### Random Number Generator

I know this is a message board for homework but I have a question for something that I'm actually doing at work. Its been three years since my...

• Replies: 1
• Views: 4,238
06-08-2007, 04:06 AM
5. ### A simple but trickly probability question

My coworker asked me a probability problem. It seems simple, but, maybe not actually. Could anyone help me and take a look at the problem? Your...

• Replies: 2
• Views: 2,173
06-09-2007, 05:01 AM
6. ### Shooting Gallery Problem

I have a shooting gallery probability problem that I can't figure out. Basically, the scenario involves ten hunters that all have a perfect shot....

• Replies: 2
• Views: 2,123
06-10-2007, 09:41 PM
7. ### Uncorrelation

Hello. I'm stuck on how to start this problem. Any tips are appreciated. Let X be continuously distributed with a symmetic probability density...

• Replies: 1
• Views: 3,912
06-11-2007, 02:56 PM
8. ### probability of consumption

could someone let me know what i'm doing wrong? A study of the amount of time it takes a mechanic to rebuild the transmission for a 1992 Chevrolet...

• Replies: 4
• Views: 24,484
06-13-2007, 11:06 AM
9. ### Finding the probability, given only the mean

Hello, I am in desperate need for assistance. A tutee of mine had a problem with probability. Here is the question: According to J. D. Powers...

• Replies: 4
• Views: 6,116
06-13-2007, 02:22 PM
10. ### Optimum count

Hi, I am new to this forum and hope that I am posting this question in the right section. Here is the problem that I need help on. I am using an...

• Replies: 2
• Views: 2,590
06-14-2007, 08:00 AM
11. ### Simple (?) probability question (colors problem)

Hi all, I would really appreciate if you can help me out with (what it seems) this simple probability problem. What is throwing me off is the part...

• Replies: 3
• Views: 2,816
06-14-2007, 10:21 AM
12. ### no idea where to start Urgent

An interior decorator must furnish two offices. Each office must have a desk, a chair, a file cabinet and 2 bookcases. At a local office furniture...

• Replies: 1
• Views: 2,388
06-17-2007, 12:55 AM
13. ### Can't understand some probability symbols.

For two events, A and B, P(A) =1/2, P(B) =1/3, and P(A �� B) =1/4. Find P(B | A). The symbol where is shows a box here is an upsidedown U. Does...

• Replies: 2
• Views: 21,948
06-17-2007, 01:00 AM
14. ### Intersection of compliment--help needed

Hi There: First time visitor. I have 2 mutually exclusive events A,B. Probability P(A)=0.7,P(B)=0.2 How can I calculate P(A and B')? I think the...

• Replies: 3
• Views: 3,167
06-17-2007, 04:14 AM
15. ### Probability of a "success" n or more times out of 10

Hello everyone! This is my first post on these forums. :) I've got a bit of a curiosity that I've been trying to figure out for a few days. I'm not a...

• Replies: 2
• Views: 4,881
06-17-2007, 08:26 AM
16. ### Conditional Probability

I was given this example to study, no solution to check my work. Can you help? I approached (a) using 1-P?? 1-30/100 and (b) 30/100+10/100-5/100...

• Replies: 2
• Views: 2,594
06-18-2007, 12:59 AM
17. ### Need help on statistics problem

Pregnancy durations; Data from the national vital statistics report reveal that the distribution of the duration of human pregnancies is...

• Replies: 1
• Views: 2,320
06-19-2007, 02:09 AM
18. ### Need help random variables

Question 1) A hung jury is one that is unable to reach a unanimous decision. Suppose that a pool of 25 potential jurors are assigned to a murder case...

• Replies: 2
• Views: 4,088
06-19-2007, 06:10 PM

I have a problem, I am just not figuring out and would love some help. Return on Common Stock has a mean of 14.4% and a standard deviation of...

• Replies: 1
• Views: 1,967
06-21-2007, 01:41 AM
20. ### Mean question

An oil exploration firm is formed with enough capital to finance 30 explorations. The probability of a particular exploration being successful is...

• Replies: 2
• Views: 6,071
06-21-2007, 07:27 AM
21. ### How is it possible to account for lucky guesses?

I need to solve a problem involving assessing the ability of prospective film analysts to make accurate predictions of the total U.S. box office...

• Replies: 0
• Views: 3,223
06-21-2007, 05:21 PM
22. ### Probability

Let X1,…,X25 be binomial random variables with identical parameters n=100 and p=0.3. Use the central limit theorem to calculate the probability that...

• Replies: 2
• Views: 2,057
06-21-2007, 11:47 PM
23. ### Probability: Is this right?

Chances of being audited are 3 in 100 if income less than 60 000 and 8 in 100 if income more than 60 000 a. if 7 taxpayers with income over 60 000...

• Replies: 1
• Views: 2,259
06-25-2007, 12:46 AM

Hi, I've been working on an extra credit problem, which seems pretty easy but I can't figure it out. It's only 2 points, but any help would be...

• Replies: 4
• Views: 2,856
06-28-2007, 01:42 AM
25. ### Quantifying the Prediction Error

Hello, I have a Regression model which predicts the length of certain vectors that exists in Financial Markets. These vectors start in the...

• Replies: 1
• Views: 3,101
06-29-2007, 08:43 AM

Hi, I've got a probability problem that has had me stumped all weekend. Can anybody please help? Suppose that two balanced dice are tossed...

• Replies: 1
• Views: 7,445
07-03-2007, 12:20 PM
27. ### Help with Conditonal Probability

I think this is a classic problem. :) Oscar has lost his dog in either forest A (with a priori probability 0.4), or in forest B (with a priori...

• Replies: 1
• Views: 5,845
07-03-2007, 01:08 PM
28. ### Expected Value of Exponential Distribution

I've almost completed this problem, but I'm stuck on the last part. The first two parts that I've already shown are also given: a) For a whole...

• Replies: 1
• Views: 24,984
07-03-2007, 01:24 PM
29. ### Normal Distribution Problem

Hi, I've been working on this problem for a while now and keep getting stuck. The problem says, The length of time before a cell phone using a...

• Replies: 1
• Views: 4,454
07-03-2007, 01:37 PM
30. ### Am I doing this right?

:confused: Im not sure if im doing this right. This is the question that I am working on right now. You wish to open a new restaurant and are...

• Replies: 1
• Views: 2,559
07-04-2007, 01:44 AM
31. ### Probability distribution

5.20 An investor plans to put \$50,000 in one of four investments. The return on each investment depends on whether next year’s economy is strong or...

• Replies: 1
• Views: 5,418
07-11-2007, 12:33 AM
32. ### need help with a few questions

the question is: A shrub that is purchased at a local nursery has probability .80 of surviving the first year. If a customer pruchases 4 shrubs,...

• Replies: 1
• Views: 4,859
07-13-2007, 03:55 AM
33. ### About marginal densities... confused

If we have N random variables (not necessarily normal; with some level of correlation) and M observations of them (i.e. we have M N-dimensional...

• Replies: 1
• Views: 2,532
07-13-2007, 09:38 PM
34. ### Breakeven exit strategy

Hi, I have a gambling problem (admitting it is half the battle, right?), that I hope someone can help me with. Suppose that I know from historical...

• Replies: 0
• Views: 2,548
07-18-2007, 01:22 AM
35. ### Exponentially Distributed Random Variable

Hey everyone, im having a hard time with this questions, I guess its just not clicking. I was wondering if someone could give me some pointers. ...

• Replies: 1
• Views: 4,372
07-20-2007, 07:11 AM

I have no understanding of statistics whatsoever. I need help with the following two problems: 1. Eight events in a certain sample space have an...

• Replies: 1
• Views: 2,877
07-20-2007, 11:33 PM
37. ### distribution function of the division of two variables

Hello Probably this is a silly question, but its is being resulting a non obvious task for me. Any isight would be welcome. I have a continous...

• Replies: 1
• Views: 5,820
07-20-2007, 11:44 PM
38. ### Homework Question

I posted this in the "Statistics" thread, then realized it should probably be here, in "Probability". Forgive my repetitiveness! Hi everyone: ...

• Replies: 1
• Views: 3,878
07-24-2007, 09:30 AM
39. ### How to approximate a non-standard pdf?

Hi All, I've got a bit of a techincal question here that I would greatly appreciate some guidance on. Although I have some experience with...

• Replies: 4
• Views: 3,515
07-25-2007, 11:49 AM
40. ### Help on prior distribution...

Cosider a random sample of n (consider n>100) elements, and each of them belongs to one of possible classes c1, c2,...ck (consider k<60 clases) from...

• Replies: 0
• Views: 2,345
07-29-2007, 02:05 PM
41. ### Help

When a customer enters a store there are three outcomes that can occur: buy nothing, buy a small amount or buy a large amount. In this situation, if...

• Replies: 1
• Views: 3,370
07-29-2007, 07:20 PM
42. ### Desperately needing homework help!

I tried the math lab at the local college and the statistics professor was as stumped as I was! A videotape has an average of one defect every...

• Replies: 4
• Views: 4,801
07-30-2007, 04:02 PM

I have done some basic inferential statistics before but not really done much probability before. I was wondering if someone could help me out with...

• Replies: 0
• Views: 2,059
07-31-2007, 04:11 AM
44. ### Quetion Reffering to your keno probabilities

Hello, I was googling about Keno probabilities and came across a thread in your forum about probability of hitting 5 numbers out of 80 with a draw...

• Replies: 0
• Views: 3,146
08-03-2007, 11:06 PM
45. ### Need Help with Practice Exam Question ASAP

Hi. I have an exam coming up and I have no clue on how to do this problem on the practice exam. Can someone help me as soon as you can? Thanks. ...

• Replies: 0
• Views: 2,438
08-06-2007, 08:03 AM

1.Give interpretations of the terms bias and "precision" as used in the practice of forecasting 2.Explain the terms "Goodness of fit" and...

• Replies: 1
• Views: 2,124
08-07-2007, 02:46 PM
47. ### PLEASE~ tell me if i'm doing these correctly

This is the first question for my assignment...I've used a tree diagram to solve this one. Please~~ if anyone can tell me if i'm doing this...

• Replies: 0
• Views: 2,502
08-08-2007, 08:50 PM
48. ### PLEASE check~ Q2 of my assignment..

I realli wana get all these correct. so...if anyone can also check my answers for question 2... Urn 1 contains 1 red, 3 green and 1 blue ball Urn...

• Replies: 0
• Views: 1,981
08-08-2007, 08:53 PM
49. ### Help!

Hey! I have repeat exams coming up now in a couple of weeks and need some help in different questions! If i gave you my email address would you be...

• Replies: 0
• Views: 1,778
08-12-2007, 08:57 AM

Ok, So I play poker, and its been an awfully dry night of cards, at one point it feels so bad I start logging it and see that before I quit, I was...

• Replies: 1
• Views: 2,566
08-13-2007, 12:56 PM
51. ### consectutive wins in 10,000 events

Hello, Thanks in advance for your help. My question is related to probability. I think I know the answer, but I would like confirmation on my...

• Replies: 1
• Views: 2,398
08-13-2007, 03:40 PM
52. ### Need help with z-test for significance

Below is the table i have that i want to test significance on. Total Status YES NO DONT KNOW 48 N 93.92 1.85 4.23...

• Replies: 1
• Views: 3,273
08-16-2007, 09:44 AM
53. ### help

I am having a difficult time understanding probability. Here are some questions I am trying to figure out. 1.) Several students are unprepared for...

• Replies: 1
• Views: 4,552
08-17-2007, 08:06 AM
54. ### Confidence Interval HELP Plz

Plz Help!!!!!!! I can't figure this out Confidence interval for the population mean: Use of the t distribution A corporation that maintains a...

• Replies: 1
• Views: 5,038
08-21-2007, 11:13 AM
55. ### Erlang-k where k is Negative Binomial

I have a stochastic process where calls have exponential interarrival times with parameter L and I have a stationary probability, p, that a call is...

• Replies: 0
• Views: 2,667
08-28-2007, 10:35 AM
56. ### Probability of 4 byte random occuring in 64K

I would like to replace the NULLs in some compressed data with a sequence of bytes. The maximum size of the data is 64K bytes (each byte is a...

• Replies: 0
• Views: 2,580
08-29-2007, 12:40 PM
57. ### I don't know where to start.

Hi, I need to know how to figure out a question, I am hoping that someone can help me. The question is: there are 3 boxes that generate random...

• Replies: 0
• Views: 2,350
08-29-2007, 03:30 PM
58. ### Probability Help!!!

I need help. The probability that you will pass a test is .74. what is the probability that you will fail the test? Is it .26?

• Replies: 1
• Views: 2,366
09-03-2007, 03:24 AM

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