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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: 30,337
09-30-2005, 09:44 AM
1. ### 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: 3,917
06-11-2007, 02:56 PM
2. ### Weighted sums of random variables

In an effort to determine the expected return of two stocks (A and B), I'm instructed in my homework to use the formula Y=a(subscript)1 X(sub)1 +...

• Replies: 1
• Views: 3,257
01-28-2007, 04:03 PM

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: 3,159
01-17-2007, 12:31 AM
4. ### 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: 4,249
01-19-2007, 10:08 PM
5. ### probaliblity question

a producer of a fruit drink advertises it contains 10% real fruit juices. A sample of 75 bottles are analyzed and it's found that only 6.6% is real...

• Replies: 1
• Views: 2,260
01-28-2007, 04:27 PM
6. ### Conditional probability...

------- Jose and Jim go duck hunting together. Suppose that Jose hits the target with a probability 0.3 and Jim, independently, with a probability...

• Replies: 1
• Views: 3,684
01-31-2007, 06:17 PM
7. ### Permutation Problem - help me understand pls!

I am reading this example about permutation and can't understand how to go about rationalize it. Example: Suppose that 2 anthropology, 4 computer...

• Replies: 1
• Views: 5,926
01-31-2007, 06:17 AM
8. ### Crazy union/intersection question.

Paul will be taking three exams - call them A, B and C. You are given: -It is certain that he will pass at least one exam. -The probability that...

• Replies: 1
• Views: 2,863
02-05-2007, 12:17 PM
9. ### Distributions

Hello there, Finally got the hang of the this from by using my Excel. Although, I would love to do by the formula method. Im not sure what...

• Replies: 1
• Views: 2,897
02-06-2007, 07:45 AM
10. ### prob question

I have a 3 part question and I think i've got the first 2 parts but i'm stuck on third. it's: there is a cabin that has a probability of.05 of being...

• Replies: 1
• Views: 2,185
04-17-2007, 07:42 AM
11. ### 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: 3,105
06-29-2007, 08:43 AM
12. ### Probability Problem

I need some help with this probability problem. On any given day, Jen will sell 85% of her baked goods. For a sample of 500 potential customers,...

• Replies: 1
• Views: 5,154
04-24-2007, 01:15 AM
13. ### Need help plz

Here is the problem I am stuck on...it's easy, I just can't seem to figure it out for some reason: In a class, the grades are normally...

• Replies: 1
• Views: 2,024
04-24-2007, 01:06 AM
14. ### 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: 4,457
07-03-2007, 01:37 PM
15. ### Its been a while since I opened a stats book

I run a business that uses phone numbers (without country code) to identify customers. We currently run in a country that uses 8 digit phone numbers...

• Replies: 1
• Views: 2,575
05-14-2007, 04:16 AM
16. ### Introduction to Statistics question

Hello All, I have a question on my study guide that says A random sample of 64 observations produced the following summary statistics: sample...

• Replies: 1
• Views: 3,870
04-30-2007, 08:17 AM
17. ### an interesting Bayesian stat question

Suppose a random sample of size n is from uniform distribution U(0, exp(gamma)), suppose the prior distribution of gamma is N(a, b), how to find the...

• Replies: 1
• Views: 1,964
05-02-2007, 11:21 AM
18. ### URGENT help needed

A company are searching for 5 oil wells in a landscape the sucess rate of finding a hole is 10% (0.1) for each hole therefore failure must be 90%...

• Replies: 1
• Views: 2,043
05-02-2007, 09:50 AM
19. ### How to get this Z value?

P<=.667 Z.667 = .432 My question is how to get .432 by using the cumulative normal probability table(z-values). Thanks for your help,...

• Replies: 1
• Views: 2,289
05-05-2007, 03:16 PM
20. ### Newbie stuck with problem...

I am horrible at math and can't seem to grasp this at all... A local bank reports that 70% of it's customers maintain a chequing account, 50% have a...

• Replies: 1
• Views: 3,030
05-06-2007, 10:58 AM
21. ### Previously Posted Question

I am trying to view the attachments that are connected to this previous thread. Can anyone help. http://www.talkstats.com/showthread.php?t=1301 ...

• Replies: 1
• Views: 2,557
05-21-2007, 02:38 AM
22. ### 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: 2,562
07-04-2007, 01:44 AM
23. ### Urgent Help needed. Thanks in advance.

Join Date: May 2007 Posts: 1 kellan is on a distinguished road Help needed on problem, URGENT! Thanks in advance. I'm stuck on figuring otu...

• Replies: 1
• Views: 3,462
05-19-2007, 12:51 AM
24. ### "Fair Game" problem

Hello, I'm new here. I joined in the hope that someone would be able to help me with this problem: --- Players A and B play a fair game for \$20:...

• Replies: 1
• Views: 3,555
05-18-2007, 12:54 PM
25. ### 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: 5,849
07-03-2007, 01:08 PM
26. ### a random number generator problem

Hello all, I have to resolve the next type of problem: I have a machine that is supposed to generate truely random 0/1 values. If i'm testing...

• Replies: 1
• Views: 3,403
05-19-2007, 12:07 AM
27. ### 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: 24,988
07-03-2007, 01:24 PM
28. ### Relative Frequency

I'm stuck on this one problem. We have the relative error defined as the square root of the variance divided by the expected value. We need to...

• Replies: 1
• Views: 3,178
06-01-2007, 04:45 AM
29. ### 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: 3,925
06-03-2007, 05:54 PM
30. ### 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: 4,244
06-08-2007, 04:06 AM
31. ### 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
32. ### 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: 2,326
06-19-2007, 02:09 AM

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: 1,968
06-21-2007, 01:41 AM
34. ### 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: 2,265
06-25-2007, 12:46 AM
35. ### 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: 5,822
07-20-2007, 11:44 PM

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: 7,447
07-03-2007, 12:20 PM
37. ### 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: 5,422
07-11-2007, 12:33 AM
38. ### 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: 4,865
07-13-2007, 03:55 AM
39. ### 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: 2,536
07-13-2007, 09:38 PM

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: 2,885
07-20-2007, 11:33 PM
41. ### 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: 4,376
07-20-2007, 07:11 AM
42. ### 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: 3,882
07-24-2007, 09:30 AM
43. ### 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: 3,375
07-29-2007, 07:20 PM

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: 2,125
08-07-2007, 02:46 PM
45. ### 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: 2,402
08-13-2007, 03:40 PM

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: 2,569
08-13-2007, 12:56 PM
47. ### 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: 3,285
08-16-2007, 09:44 AM
48. ### 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: 4,556
08-17-2007, 08:06 AM
49. ### 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: 5,043
08-21-2007, 11:13 AM
50. ### Bayes Rule Problem

Ok, I'm trying to learn Baye's Rule, but I'm very new to it. I understand the rule to say P(A given B) = P(B given A) x P(A) / Assuming that...

• Replies: 1
• Views: 2,736
09-04-2007, 09:33 AM
51. ### 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: 2,369
09-03-2007, 03:24 AM
52. ### Question from a novice

I have not studied statistics in college, but I have a question that is probably a simple one. I have had this discussion with my friends, but we...

• Replies: 1
• Views: 2,376
09-06-2007, 09:31 AM
53. ### Requested Probability-Help

P(Z>-2.576) is it .5000 + .4951 =.9951

• Replies: 1
• Views: 2,979
09-11-2007, 04:02 PM
54. ### circuit failure

A message is transmitted using a binary code of 0's and 1's. Each transmitted bit (0 or 1) must pass through three relays before reaching a receiver....

• Replies: 1
• Views: 4,458
09-11-2007, 12:17 AM
55. ### keno problem

In a keno game 20 numbers are picked.We write those numbers down.What is the probability of those original 20 numbers that we wrote down coming up...

• Replies: 1
• Views: 2,969
09-11-2007, 11:59 AM
56. ### i need help!

this is my first year taking a stats class and i dont understand this question if someone could explain how to do it to me that would be greatly...

• Replies: 1
• Views: 2,394
09-13-2007, 01:48 AM
57. ### How did I get this answer?

What is the probability of getting 10 heads in 20 flips of a fair coin? n = 20 x = 10 p = 0.5 I plug in the numbers into my ti-84 and get...

• Replies: 1
• Views: 3,627
09-13-2007, 02:49 PM

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