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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: 30,250
09-30-2005, 09:44 AM
1. ### Need help with probability

A local public-action group solicits by telephone. For a particular list of prospects, it was estimated that for any individual, the probability was...

• Replies: 2
• Views: 3,704
04-03-2006, 12:40 PM
2. ### basic probability question

Probability of 12 defects in one batch = 0.3060 If two more batches are produced, find the probability that all 3 batches will contain at least 12...

• Replies: 2
• Views: 2,650
04-03-2006, 03:00 PM
3. ### one question

well, I did post this in another forum, but I just realized I probably should have posted it here. I've just been having trouble with this one...

• Replies: 1
• Views: 2,475
04-04-2006, 02:24 PM
4. ### Probability help

In a meat packaging plant, Machine A accounts for 60% of the plant’s output while Machine B accounts for 40% of the plant’s output. 1% of the...

• Replies: 6
• Views: 3,241
04-05-2006, 09:55 AM
5. ### Help on probability

Probability of 12 defects in one batch = 0.3060 If two more batches are produced, find the probability that all 3 batches will contain at least 12...

• Replies: 4
• Views: 2,689
04-05-2006, 10:01 AM
6. ### Uniform Distribution

Can a probability P(X=.2) be found using a Uniform Distribution? Or just P(x<.2) and P(x>.2). Can area be finite?

• Replies: 1
• Views: 3,465
04-05-2006, 02:48 PM
7. ### Stats assignment totally lost on 1 quesiton.

Hi Guys I'm new here so Hi to everyone. Anyway I have done the rest of the questions easily but stuck on this one: “Cascade Paint” mixes...

• Replies: 5
• Views: 2,858
04-06-2006, 08:07 AM
8. ### Normal Distribution

Assume x has a normal distribution, and find the indicated probability. The mean is 200, standard deviation 50. Find the following probability: ...

• Replies: 3
• Views: 3,427
04-08-2006, 02:59 PM
9. ### Is anyone good with Monty Hall problems?

I have a Monty Hall problem with 10 doors behind two doors are prizes. Monty must show two non winning doors and can not show you what is behind the...

• Replies: 2
• Views: 3,064
04-10-2006, 10:25 AM
10. ### 2 probability question

I have just recently been learning probability and I have been having troubles with some questions. If someone can help me on these two question, I...

• Replies: 1
• Views: 3,658
04-11-2006, 07:54 AM
11. ### My brain is oozing out of my head!

I am very lost. I have read my notes and text book but this teacher has me very confused. Can anyone fill me in? The number of semester hours of...

• Replies: 1
• Views: 4,184
04-11-2006, 10:39 PM
12. ### I never knew calculating probability was so difficult!

I'm having a really hard time wrapping my mind around these questions! I think I might be thinking of this too simplistically. If someone could...

• Replies: 4
• Views: 3,193
04-12-2006, 08:36 AM
13. ### Realing struggling

I know this is probably a simple problem, but I can't seem to wrap my brain around it. Here it is: You are dealt 5 cards from a well shuffled,...

• Replies: 0
• Views: 2,917
04-15-2006, 07:00 PM
14. ### Yet more problems!!!

OK. Like I said. I am really struggling with this. Here are two more I can't grasp. 1. You are fishing at a Reservoir. The Department of...

• Replies: 0
• Views: 2,077
04-15-2006, 07:08 PM
15. ### here is another one

I have done this a million times with the same result... it is apparently incorrect but I cannot figure out why... what percentage of a circle will...

• Replies: 1
• Views: 2,431
04-15-2006, 11:18 PM

This may seem like an easy problem, but I have been racking my brain for hours trying to find the solution. I know the answer to the problem is...

• Replies: 1
• Views: 2,332
04-17-2006, 10:15 AM
17. ### Help! - Probability Problem

I need some help with this one: A company is considering implementing one of two quality control plans for monitoring the weights of automobile...

• Replies: 1
• Views: 7,746
04-18-2006, 06:48 AM
18. ### Permutation or Combination? Who knows? How to know?

I think I have a decent understanding of the difference btwn permuation and combination. But occasionally a word problem comes up that throws me a...

• Replies: 2
• Views: 6,093
04-18-2006, 04:35 PM
19. ### first timer

hi guys, this is my first post here...i decided to come here cos i really am stuck with a bunch of question in an assignment for probabilities that i...

• Replies: 1
• Views: 2,979
04-19-2006, 09:50 AM
20. ### Probability involving stock market help pls

Stock A and stock B. Every day the price of stock A will either increase by 1 dollar with probability 0.6 or decrease by one dollar with...

• Replies: 0
• Views: 3,553
04-19-2006, 04:59 PM
21. ### Probability

You have applied for a summer job at Store A and also at Store B. You estimate that probabilities of getting the job at the stores A and B are 0.1...

• Replies: 1
• Views: 2,828
04-20-2006, 09:06 AM
22. ### Probability Question

A mortgage company knows that 8% of its loan recipients default within the first five years. To be profitable the company must have no more than 25...

• Replies: 4
• Views: 3,268
04-20-2006, 08:52 PM
23. ### Normal Distribution Problem

I'm having trouble getting this one started: Jake runs the concession stand for a Chicago area minor league baseball team. He knows that hot dog...

• Replies: 0
• Views: 3,393
04-20-2006, 08:58 PM
24. ### Conditional Probability and Variance

In a conditional probability problem, I have computed Var(X|Y=y) for all values of y. How would I go about computing the Var(X) using this...

• Replies: 0
• Views: 3,964
04-20-2006, 09:59 PM
25. ### Help! Test Tomorrow

O.K. Here is my question that I am struggling with: Of all college freshman that try out for the track team, the coach will accept only 30%. If 15...

• Replies: 0
• Views: 5,089
04-20-2006, 11:24 PM
26. ### poisson process probability distributions

• Replies: 0
• Views: 3,061
04-20-2006, 11:56 PM
27. ### Prob w/Combination of At Least AND Combination

I'm stuck on this. I've had similar probs, but none that combine the At Least with this type of selection. I really hate to ask for help on a...

• Replies: 5
• Views: 10,407
04-23-2006, 08:38 AM
28. ### Standard Normal Variable Z ... I do not understand

:confused: Hi, This is not a homework question as I have the answer, just trying to figure out the method; I have a "Normal Distribution...

• Replies: 2
• Views: 19,033
04-23-2006, 02:33 PM
29. ### Stuck on Setting upa problem.

I been having a problem solving this type of question. I have the answers to this along with variations of the same problem, but I am still un able...

• Replies: 1
• Views: 6,372
04-24-2006, 08:57 PM
30. ### Permutations

I'm having trouble with this one: In how many different was can the letters of the word "BLUEBERRY" be arranged? I got 7,560? Is that what...

• Replies: 4
• Views: 3,428
04-25-2006, 02:12 PM
31. ### Exponential Probability

Data are observed on lifetime of 5 electronic units (in hundreds of hours): 6.7, 5.0+, 6.1, 8.0, 10.0 where the "+" denotes that the unit's...

• Replies: 0
• Views: 2,545
04-26-2006, 10:16 AM
32. ### Binomial Distribution

I am struggling with statistics (now, there's a first!) I am working in binomial distribution and trying to determine probability of rolling a...

• Replies: 2
• Views: 3,101
04-26-2006, 11:03 PM
33. ### mathematical expectation

A despondent math professor is traveling to Las Vegas to bet his entire life savings, \$20,000, on one roll of the (two) dice. If the total is 7 or...

• Replies: 4
• Views: 4,763
04-27-2006, 10:47 AM
34. ### finding probability

According to the Bureau of Navel Standards, 75 percent of all people are "inners," (that is their belly buttons poke inward); everyone else is an...

• Replies: 7
• Views: 5,144
04-27-2006, 01:03 PM
35. ### Thanks to John M & more questions

Thanks to John M for all of his help! I have several more questions that I got wrong answers on and would like to know the correct answers if anyone...

• Replies: 8
• Views: 3,239
04-27-2006, 01:42 PM
36. ### hypergeometric probabilty distribution

I have been trying to figure this out for a week... we have 20 runners and of these 20, 10 prefer adidas, 6 nike, and 4 k swiss. if we take 10 of...

• Replies: 3
• Views: 2,906
04-29-2006, 04:21 PM
37. ### Solving for "b" when I know normal distribution of x

I submitted the following for a quiz and was told it was incorrect. I reviewed the section and started fresh, only to come back to the same answer. ...

• Replies: 2
• Views: 2,266
04-30-2006, 01:02 PM
38. ### New to statistics, but I am trying

I have been working on this problem for two days, I cannot come up with the correct way to work it. My instructor did not teach this type. The...

• Replies: 1
• Views: 4,786
05-01-2006, 09:30 AM
39. ### probability problem

Good Afternoon! I'm really glad I found this site, because I have thought myself into a corner! I am a Grade 8 and 9 science teacher and have...

• Replies: 5
• Views: 2,864
05-01-2006, 12:24 PM
40. ### Probability of Independent Event

:wave: I was hoping someone can help me set up this problem. I don’t need the answer just how to set up the first step: A test consists of 10...

• Replies: 2
• Views: 3,127
05-03-2006, 03:54 PM
41. ### Probability/Counting Rules Help

Hey: Would anyone know how to approach these two problems below? Many thanks in advance. A sales company purchases 15 new chars for its top...

• Replies: 2
• Views: 5,228
05-06-2006, 04:33 PM
42. ### Distribution Questions

Hi guys, having trouble with these... dont quite understand.. When you have a: Uniform Distribution Right Skewed Distribution Left skewed...

• Replies: 2
• Views: 2,624
JVC
05-07-2006, 08:04 AM
43. ### Standard Deviation

I'm tearing my hair out over this Stats problem: Age at onset of dementia was determined for a sample of adults between the ages of 60 and 75. For...

• Replies: 1
• Views: 2,855
05-08-2006, 10:16 AM
44. ### probability

A project director runs a staff consisting of 6 scientists and 3 lab technicians. Three new projects have to be worked on and the director decides to...

• Replies: 1
• Views: 2,671
05-10-2006, 07:17 PM

Hello, I recently started a statistics class and I'm really struggling with it. I feel so dumb. I read the assigned chapters and they make...

• Replies: 5
• Views: 2,665
05-14-2006, 09:50 PM
46. ### prob word problem Q

A growing manufacturing company has kept careful records of applicants who have applied for jobs on their assembly lines. The probability that a new...

• Replies: 1
• Views: 2,923
05-16-2006, 12:10 PM
47. ### figuring out a cutoff value

:confused: Hello :confused: Since my teacher hasn't replied to any of my e-mails, I could use some help related to continuous probability...

• Replies: 1
• Views: 7,894
05-19-2006, 12:20 PM
48. ### word problems

Here are a few more questions that I got wrong and need help figuring out if anyone could help. Question 1: The length of time for students to...

• Replies: 3
• Views: 4,055
05-19-2006, 12:21 PM
49. ### Uniform Dist.

Hey, havin a bit of trouble on this question, not quite sure what to do If X is uniformly dist. over a range of values 8 to 21 pr(X>=7)? Do...

• Replies: 2
• Views: 2,597
05-23-2006, 04:12 AM
50. ### probability geneticist

I was able to answer the first 3 parts of this question but i cant figure out the last one A geneticist has bred three different strains of...

• Replies: 1
• Views: 2,741
05-24-2006, 08:02 PM
51. ### P Value

38 of 120 high school students work over 20 hours per week. Does this demonstrate that more than 25% of high school students work over 20 hours...

• Replies: 0
• Views: 3,138
05-24-2006, 11:39 PM
52. ### another probability

this question has three parts and once again I was able to answer part A and B by drawing the tree diagram but I cant seem to figure out part C ...

• Replies: 2
• Views: 2,650
05-25-2006, 09:05 PM
53. ### probability distribution

A keyring contains 4 keys that appear to be identical, although only one will open a particular door. Describe the probability distribution of X: ...

• Replies: 1
• Views: 2,775
05-29-2006, 03:09 PM
54. ### Normal distribution and intervals

I keep turning these around and am hoping I am on the right track Distribution of raw scores has mean=581 and sd=70. Find the interval of...

• Replies: 1
• Views: 2,264
05-30-2006, 10:10 AM
55. ### random variables/probability distributions

nevermind:)

• Replies: 0
• Views: 2,176
06-01-2006, 08:34 PM

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